#include "funcapi.h"
#include "miscadmin.h"
#include "utils/builtins.h"
+#include "utils/rel.h"
PG_FUNCTION_INFO_V1(hash_page_type);
PG_FUNCTION_INFO_V1(hash_page_stats);
#include "storage/ipc.h"
#include "storage/spin.h"
#include "tcop/utility.h"
+#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "utils/fmgroids.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
+#include "utils/partcache.h"
#include "utils/rel.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
*
*-------------------------------------------------------------------------
*/
-
#include "postgres.h"
-#include "access/hash.h"
+#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
-#include "access/nbtree.h"
+#include "access/tupconvert.h"
#include "access/sysattr.h"
-#include "catalog/dependency.h"
#include "catalog/indexing.h"
-#include "catalog/objectaddress.h"
#include "catalog/partition.h"
-#include "catalog/pg_collation.h"
#include "catalog/pg_inherits.h"
-#include "catalog/pg_opclass.h"
#include "catalog/pg_partitioned_table.h"
-#include "catalog/pg_type.h"
-#include "commands/tablecmds.h"
-#include "executor/executor.h"
-#include "miscadmin.h"
#include "nodes/makefuncs.h"
-#include "nodes/nodeFuncs.h"
-#include "nodes/parsenodes.h"
#include "optimizer/clauses.h"
-#include "optimizer/planmain.h"
#include "optimizer/prep.h"
#include "optimizer/var.h"
-#include "parser/parse_coerce.h"
#include "partitioning/partbounds.h"
#include "rewrite/rewriteManip.h"
-#include "storage/lmgr.h"
-#include "utils/array.h"
-#include "utils/builtins.h"
-#include "utils/datum.h"
#include "utils/fmgroids.h"
-#include "utils/hashutils.h"
-#include "utils/inval.h"
-#include "utils/lsyscache.h"
-#include "utils/memutils.h"
+#include "utils/partcache.h"
#include "utils/rel.h"
-#include "utils/ruleutils.h"
#include "utils/syscache.h"
static Oid get_partition_parent_worker(Relation inhRel, Oid relid);
static void get_partition_ancestors_worker(Relation inhRel, Oid relid,
List **ancestors);
-static int32 qsort_partition_hbound_cmp(const void *a, const void *b);
-static int32 qsort_partition_list_value_cmp(const void *a, const void *b,
- void *arg);
-static int32 qsort_partition_rbound_cmp(const void *a, const void *b,
- void *arg);
-
-static Oid get_partition_operator(PartitionKey key, int col,
- StrategyNumber strategy, bool *need_relabel);
-static Expr *make_partition_op_expr(PartitionKey key, int keynum,
- uint16 strategy, Expr *arg1, Expr *arg2);
-static void get_range_key_properties(PartitionKey key, int keynum,
- PartitionRangeDatum *ldatum,
- PartitionRangeDatum *udatum,
- ListCell **partexprs_item,
- Expr **keyCol,
- Const **lower_val, Const **upper_val);
-static List *get_qual_for_hash(Relation parent, PartitionBoundSpec *spec);
-static List *get_qual_for_list(Relation parent, PartitionBoundSpec *spec);
-static List *get_qual_for_range(Relation parent, PartitionBoundSpec *spec,
- bool for_default);
-static List *get_range_nulltest(PartitionKey key);
-static List *generate_partition_qual(Relation rel);
-
-static PartitionRangeBound *make_one_range_bound(PartitionKey key, int index,
- List *datums, bool lower);
-static int32 partition_hbound_cmp(int modulus1, int remainder1, int modulus2,
- int remainder2);
-static int32 partition_rbound_cmp(int partnatts, FmgrInfo *partsupfunc,
- Oid *partcollation, Datum *datums1,
- PartitionRangeDatumKind *kind1, bool lower1,
- PartitionRangeBound *b2);
-
-static int get_partition_bound_num_indexes(PartitionBoundInfo b);
-
/*
- * RelationBuildPartitionDesc
- * Form rel's partition descriptor
+ * get_partition_parent
+ * Obtain direct parent of given relation
+ *
+ * Returns inheritance parent of a partition by scanning pg_inherits
*
- * Not flushed from the cache by RelationClearRelation() unless changed because
- * of addition or removal of partition.
+ * Note: Because this function assumes that the relation whose OID is passed
+ * as an argument will have precisely one parent, it should only be called
+ * when it is known that the relation is a partition.
*/
-void
-RelationBuildPartitionDesc(Relation rel)
+Oid
+get_partition_parent(Oid relid)
{
- List *inhoids,
- *partoids;
- Oid *oids = NULL;
- List *boundspecs = NIL;
- ListCell *cell;
- int i,
- nparts;
- PartitionKey key = RelationGetPartitionKey(rel);
- PartitionDesc result;
- MemoryContext oldcxt;
-
- int ndatums = 0;
- int default_index = -1;
-
- /* Hash partitioning specific */
- PartitionHashBound **hbounds = NULL;
-
- /* List partitioning specific */
- PartitionListValue **all_values = NULL;
- int null_index = -1;
-
- /* Range partitioning specific */
- PartitionRangeBound **rbounds = NULL;
-
- /* Get partition oids from pg_inherits */
- inhoids = find_inheritance_children(RelationGetRelid(rel), NoLock);
-
- /* Collect bound spec nodes in a list */
- i = 0;
- partoids = NIL;
- foreach(cell, inhoids)
- {
- Oid inhrelid = lfirst_oid(cell);
- HeapTuple tuple;
- Datum datum;
- bool isnull;
- Node *boundspec;
+ Relation catalogRelation;
+ Oid result;
- tuple = SearchSysCache1(RELOID, inhrelid);
- if (!HeapTupleIsValid(tuple))
- elog(ERROR, "cache lookup failed for relation %u", inhrelid);
+ catalogRelation = heap_open(InheritsRelationId, AccessShareLock);
- /*
- * It is possible that the pg_class tuple of a partition has not been
- * updated yet to set its relpartbound field. The only case where
- * this happens is when we open the parent relation to check using its
- * partition descriptor that a new partition's bound does not overlap
- * some existing partition.
- */
- if (!((Form_pg_class) GETSTRUCT(tuple))->relispartition)
- {
- ReleaseSysCache(tuple);
- continue;
- }
+ result = get_partition_parent_worker(catalogRelation, relid);
- datum = SysCacheGetAttr(RELOID, tuple,
- Anum_pg_class_relpartbound,
- &isnull);
- Assert(!isnull);
- boundspec = (Node *) stringToNode(TextDatumGetCString(datum));
+ if (!OidIsValid(result))
+ elog(ERROR, "could not find tuple for parent of relation %u", relid);
- /*
- * Sanity check: If the PartitionBoundSpec says this is the default
- * partition, its OID should correspond to whatever's stored in
- * pg_partitioned_table.partdefid; if not, the catalog is corrupt.
- */
- if (castNode(PartitionBoundSpec, boundspec)->is_default)
- {
- Oid partdefid;
+ heap_close(catalogRelation, AccessShareLock);
- partdefid = get_default_partition_oid(RelationGetRelid(rel));
- if (partdefid != inhrelid)
- elog(ERROR, "expected partdefid %u, but got %u",
- inhrelid, partdefid);
- }
+ return result;
+}
- boundspecs = lappend(boundspecs, boundspec);
- partoids = lappend_oid(partoids, inhrelid);
- ReleaseSysCache(tuple);
- }
+/*
+ * get_partition_parent_worker
+ * Scan the pg_inherits relation to return the OID of the parent of the
+ * given relation
+ */
+static Oid
+get_partition_parent_worker(Relation inhRel, Oid relid)
+{
+ SysScanDesc scan;
+ ScanKeyData key[2];
+ Oid result = InvalidOid;
+ HeapTuple tuple;
- nparts = list_length(partoids);
+ ScanKeyInit(&key[0],
+ Anum_pg_inherits_inhrelid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(relid));
+ ScanKeyInit(&key[1],
+ Anum_pg_inherits_inhseqno,
+ BTEqualStrategyNumber, F_INT4EQ,
+ Int32GetDatum(1));
- if (nparts > 0)
+ scan = systable_beginscan(inhRel, InheritsRelidSeqnoIndexId, true,
+ NULL, 2, key);
+ tuple = systable_getnext(scan);
+ if (HeapTupleIsValid(tuple))
{
- oids = (Oid *) palloc(nparts * sizeof(Oid));
- i = 0;
- foreach(cell, partoids)
- oids[i++] = lfirst_oid(cell);
-
- /* Convert from node to the internal representation */
- if (key->strategy == PARTITION_STRATEGY_HASH)
- {
- ndatums = nparts;
- hbounds = (PartitionHashBound **)
- palloc(nparts * sizeof(PartitionHashBound *));
-
- i = 0;
- foreach(cell, boundspecs)
- {
- PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
- lfirst(cell));
-
- if (spec->strategy != PARTITION_STRATEGY_HASH)
- elog(ERROR, "invalid strategy in partition bound spec");
-
- hbounds[i] = (PartitionHashBound *)
- palloc(sizeof(PartitionHashBound));
-
- hbounds[i]->modulus = spec->modulus;
- hbounds[i]->remainder = spec->remainder;
- hbounds[i]->index = i;
- i++;
- }
-
- /* Sort all the bounds in ascending order */
- qsort(hbounds, nparts, sizeof(PartitionHashBound *),
- qsort_partition_hbound_cmp);
- }
- else if (key->strategy == PARTITION_STRATEGY_LIST)
- {
- List *non_null_values = NIL;
-
- /*
- * Create a unified list of non-null values across all partitions.
- */
- i = 0;
- null_index = -1;
- foreach(cell, boundspecs)
- {
- PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
- lfirst(cell));
- ListCell *c;
-
- if (spec->strategy != PARTITION_STRATEGY_LIST)
- elog(ERROR, "invalid strategy in partition bound spec");
-
- /*
- * Note the index of the partition bound spec for the default
- * partition. There's no datum to add to the list of non-null
- * datums for this partition.
- */
- if (spec->is_default)
- {
- default_index = i;
- i++;
- continue;
- }
-
- foreach(c, spec->listdatums)
- {
- Const *val = castNode(Const, lfirst(c));
- PartitionListValue *list_value = NULL;
-
- if (!val->constisnull)
- {
- list_value = (PartitionListValue *)
- palloc0(sizeof(PartitionListValue));
- list_value->index = i;
- list_value->value = val->constvalue;
- }
- else
- {
- /*
- * Never put a null into the values array, flag
- * instead for the code further down below where we
- * construct the actual relcache struct.
- */
- if (null_index != -1)
- elog(ERROR, "found null more than once");
- null_index = i;
- }
-
- if (list_value)
- non_null_values = lappend(non_null_values,
- list_value);
- }
-
- i++;
- }
-
- ndatums = list_length(non_null_values);
-
- /*
- * Collect all list values in one array. Alongside the value, we
- * also save the index of partition the value comes from.
- */
- all_values = (PartitionListValue **) palloc(ndatums *
- sizeof(PartitionListValue *));
- i = 0;
- foreach(cell, non_null_values)
- {
- PartitionListValue *src = lfirst(cell);
-
- all_values[i] = (PartitionListValue *)
- palloc(sizeof(PartitionListValue));
- all_values[i]->value = src->value;
- all_values[i]->index = src->index;
- i++;
- }
-
- qsort_arg(all_values, ndatums, sizeof(PartitionListValue *),
- qsort_partition_list_value_cmp, (void *) key);
- }
- else if (key->strategy == PARTITION_STRATEGY_RANGE)
- {
- int k;
- PartitionRangeBound **all_bounds,
- *prev;
-
- all_bounds = (PartitionRangeBound **) palloc0(2 * nparts *
- sizeof(PartitionRangeBound *));
-
- /*
- * Create a unified list of range bounds across all the
- * partitions.
- */
- i = ndatums = 0;
- foreach(cell, boundspecs)
- {
- PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
- lfirst(cell));
- PartitionRangeBound *lower,
- *upper;
-
- if (spec->strategy != PARTITION_STRATEGY_RANGE)
- elog(ERROR, "invalid strategy in partition bound spec");
-
- /*
- * Note the index of the partition bound spec for the default
- * partition. There's no datum to add to the allbounds array
- * for this partition.
- */
- if (spec->is_default)
- {
- default_index = i++;
- continue;
- }
-
- lower = make_one_range_bound(key, i, spec->lowerdatums,
- true);
- upper = make_one_range_bound(key, i, spec->upperdatums,
- false);
- all_bounds[ndatums++] = lower;
- all_bounds[ndatums++] = upper;
- i++;
- }
-
- Assert(ndatums == nparts * 2 ||
- (default_index != -1 && ndatums == (nparts - 1) * 2));
-
- /* Sort all the bounds in ascending order */
- qsort_arg(all_bounds, ndatums,
- sizeof(PartitionRangeBound *),
- qsort_partition_rbound_cmp,
- (void *) key);
-
- /* Save distinct bounds from all_bounds into rbounds. */
- rbounds = (PartitionRangeBound **)
- palloc(ndatums * sizeof(PartitionRangeBound *));
- k = 0;
- prev = NULL;
- for (i = 0; i < ndatums; i++)
- {
- PartitionRangeBound *cur = all_bounds[i];
- bool is_distinct = false;
- int j;
-
- /* Is the current bound distinct from the previous one? */
- for (j = 0; j < key->partnatts; j++)
- {
- Datum cmpval;
-
- if (prev == NULL || cur->kind[j] != prev->kind[j])
- {
- is_distinct = true;
- break;
- }
-
- /*
- * If the bounds are both MINVALUE or MAXVALUE, stop now
- * and treat them as equal, since any values after this
- * point must be ignored.
- */
- if (cur->kind[j] != PARTITION_RANGE_DATUM_VALUE)
- break;
-
- cmpval = FunctionCall2Coll(&key->partsupfunc[j],
- key->partcollation[j],
- cur->datums[j],
- prev->datums[j]);
- if (DatumGetInt32(cmpval) != 0)
- {
- is_distinct = true;
- break;
- }
- }
-
- /*
- * Only if the bound is distinct save it into a temporary
- * array i.e. rbounds which is later copied into boundinfo
- * datums array.
- */
- if (is_distinct)
- rbounds[k++] = all_bounds[i];
-
- prev = cur;
- }
+ Form_pg_inherits form = (Form_pg_inherits) GETSTRUCT(tuple);
- /* Update ndatums to hold the count of distinct datums. */
- ndatums = k;
- }
- else
- elog(ERROR, "unexpected partition strategy: %d",
- (int) key->strategy);
+ result = form->inhparent;
}
- /* Now build the actual relcache partition descriptor */
- rel->rd_pdcxt = AllocSetContextCreate(CacheMemoryContext,
- "partition descriptor",
- ALLOCSET_DEFAULT_SIZES);
- MemoryContextCopyAndSetIdentifier(rel->rd_pdcxt, RelationGetRelationName(rel));
-
- oldcxt = MemoryContextSwitchTo(rel->rd_pdcxt);
-
- result = (PartitionDescData *) palloc0(sizeof(PartitionDescData));
- result->nparts = nparts;
- if (nparts > 0)
- {
- PartitionBoundInfo boundinfo;
- int *mapping;
- int next_index = 0;
-
- result->oids = (Oid *) palloc0(nparts * sizeof(Oid));
-
- boundinfo = (PartitionBoundInfoData *)
- palloc0(sizeof(PartitionBoundInfoData));
- boundinfo->strategy = key->strategy;
- boundinfo->default_index = -1;
- boundinfo->ndatums = ndatums;
- boundinfo->null_index = -1;
- boundinfo->datums = (Datum **) palloc0(ndatums * sizeof(Datum *));
-
- /* Initialize mapping array with invalid values */
- mapping = (int *) palloc(sizeof(int) * nparts);
- for (i = 0; i < nparts; i++)
- mapping[i] = -1;
-
- switch (key->strategy)
- {
- case PARTITION_STRATEGY_HASH:
- {
- /* Modulus are stored in ascending order */
- int greatest_modulus = hbounds[ndatums - 1]->modulus;
-
- boundinfo->indexes = (int *) palloc(greatest_modulus *
- sizeof(int));
-
- for (i = 0; i < greatest_modulus; i++)
- boundinfo->indexes[i] = -1;
-
- for (i = 0; i < nparts; i++)
- {
- int modulus = hbounds[i]->modulus;
- int remainder = hbounds[i]->remainder;
-
- boundinfo->datums[i] = (Datum *) palloc(2 *
- sizeof(Datum));
- boundinfo->datums[i][0] = Int32GetDatum(modulus);
- boundinfo->datums[i][1] = Int32GetDatum(remainder);
-
- while (remainder < greatest_modulus)
- {
- /* overlap? */
- Assert(boundinfo->indexes[remainder] == -1);
- boundinfo->indexes[remainder] = i;
- remainder += modulus;
- }
-
- mapping[hbounds[i]->index] = i;
- pfree(hbounds[i]);
- }
- pfree(hbounds);
- break;
- }
-
- case PARTITION_STRATEGY_LIST:
- {
- boundinfo->indexes = (int *) palloc(ndatums * sizeof(int));
-
- /*
- * Copy values. Indexes of individual values are mapped
- * to canonical values so that they match for any two list
- * partitioned tables with same number of partitions and
- * same lists per partition. One way to canonicalize is
- * to assign the index in all_values[] of the smallest
- * value of each partition, as the index of all of the
- * partition's values.
- */
- for (i = 0; i < ndatums; i++)
- {
- boundinfo->datums[i] = (Datum *) palloc(sizeof(Datum));
- boundinfo->datums[i][0] = datumCopy(all_values[i]->value,
- key->parttypbyval[0],
- key->parttyplen[0]);
-
- /* If the old index has no mapping, assign one */
- if (mapping[all_values[i]->index] == -1)
- mapping[all_values[i]->index] = next_index++;
-
- boundinfo->indexes[i] = mapping[all_values[i]->index];
- }
-
- /*
- * If null-accepting partition has no mapped index yet,
- * assign one. This could happen if such partition
- * accepts only null and hence not covered in the above
- * loop which only handled non-null values.
- */
- if (null_index != -1)
- {
- Assert(null_index >= 0);
- if (mapping[null_index] == -1)
- mapping[null_index] = next_index++;
- boundinfo->null_index = mapping[null_index];
- }
-
- /* Assign mapped index for the default partition. */
- if (default_index != -1)
- {
- /*
- * The default partition accepts any value not
- * specified in the lists of other partitions, hence
- * it should not get mapped index while assigning
- * those for non-null datums.
- */
- Assert(default_index >= 0 &&
- mapping[default_index] == -1);
- mapping[default_index] = next_index++;
- boundinfo->default_index = mapping[default_index];
- }
-
- /* All partition must now have a valid mapping */
- Assert(next_index == nparts);
- break;
- }
-
- case PARTITION_STRATEGY_RANGE:
- {
- boundinfo->kind = (PartitionRangeDatumKind **)
- palloc(ndatums *
- sizeof(PartitionRangeDatumKind *));
- boundinfo->indexes = (int *) palloc((ndatums + 1) *
- sizeof(int));
-
- for (i = 0; i < ndatums; i++)
- {
- int j;
-
- boundinfo->datums[i] = (Datum *) palloc(key->partnatts *
- sizeof(Datum));
- boundinfo->kind[i] = (PartitionRangeDatumKind *)
- palloc(key->partnatts *
- sizeof(PartitionRangeDatumKind));
- for (j = 0; j < key->partnatts; j++)
- {
- if (rbounds[i]->kind[j] == PARTITION_RANGE_DATUM_VALUE)
- boundinfo->datums[i][j] =
- datumCopy(rbounds[i]->datums[j],
- key->parttypbyval[j],
- key->parttyplen[j]);
- boundinfo->kind[i][j] = rbounds[i]->kind[j];
- }
-
- /*
- * There is no mapping for invalid indexes.
- *
- * Any lower bounds in the rbounds array have invalid
- * indexes assigned, because the values between the
- * previous bound (if there is one) and this (lower)
- * bound are not part of the range of any existing
- * partition.
- */
- if (rbounds[i]->lower)
- boundinfo->indexes[i] = -1;
- else
- {
- int orig_index = rbounds[i]->index;
-
- /* If the old index has no mapping, assign one */
- if (mapping[orig_index] == -1)
- mapping[orig_index] = next_index++;
-
- boundinfo->indexes[i] = mapping[orig_index];
- }
- }
-
- /* Assign mapped index for the default partition. */
- if (default_index != -1)
- {
- Assert(default_index >= 0 && mapping[default_index] == -1);
- mapping[default_index] = next_index++;
- boundinfo->default_index = mapping[default_index];
- }
- boundinfo->indexes[i] = -1;
- break;
- }
-
- default:
- elog(ERROR, "unexpected partition strategy: %d",
- (int) key->strategy);
- }
-
- result->boundinfo = boundinfo;
-
- /*
- * Now assign OIDs from the original array into mapped indexes of the
- * result array. Order of OIDs in the former is defined by the
- * catalog scan that retrieved them, whereas that in the latter is
- * defined by canonicalized representation of the partition bounds.
- */
- for (i = 0; i < nparts; i++)
- result->oids[mapping[i]] = oids[i];
- pfree(mapping);
- }
+ systable_endscan(scan);
- MemoryContextSwitchTo(oldcxt);
- rel->rd_partdesc = result;
+ return result;
}
/*
- * Are two partition bound collections logically equal?
+ * get_partition_ancestors
+ * Obtain ancestors of given relation
*
- * Used in the keep logic of relcache.c (ie, in RelationClearRelation()).
- * This is also useful when b1 and b2 are bound collections of two separate
- * relations, respectively, because PartitionBoundInfo is a canonical
- * representation of partition bounds.
+ * Returns a list of ancestors of the given relation.
+ *
+ * Note: Because this function assumes that the relation whose OID is passed
+ * as an argument and each ancestor will have precisely one parent, it should
+ * only be called when it is known that the relation is a partition.
*/
-bool
-partition_bounds_equal(int partnatts, int16 *parttyplen, bool *parttypbyval,
- PartitionBoundInfo b1, PartitionBoundInfo b2)
+List *
+get_partition_ancestors(Oid relid)
{
- int i;
-
- if (b1->strategy != b2->strategy)
- return false;
-
- if (b1->ndatums != b2->ndatums)
- return false;
-
- if (b1->null_index != b2->null_index)
- return false;
-
- if (b1->default_index != b2->default_index)
- return false;
-
- if (b1->strategy == PARTITION_STRATEGY_HASH)
- {
- int greatest_modulus = get_hash_partition_greatest_modulus(b1);
-
- /*
- * If two hash partitioned tables have different greatest moduli,
- * their partition schemes don't match.
- */
- if (greatest_modulus != get_hash_partition_greatest_modulus(b2))
- return false;
-
- /*
- * We arrange the partitions in the ascending order of their modulus
- * and remainders. Also every modulus is factor of next larger
- * modulus. Therefore we can safely store index of a given partition
- * in indexes array at remainder of that partition. Also entries at
- * (remainder + N * modulus) positions in indexes array are all same
- * for (modulus, remainder) specification for any partition. Thus
- * datums array from both the given bounds are same, if and only if
- * their indexes array will be same. So, it suffices to compare
- * indexes array.
- */
- for (i = 0; i < greatest_modulus; i++)
- if (b1->indexes[i] != b2->indexes[i])
- return false;
-
-#ifdef USE_ASSERT_CHECKING
-
- /*
- * Nonetheless make sure that the bounds are indeed same when the
- * indexes match. Hash partition bound stores modulus and remainder
- * at b1->datums[i][0] and b1->datums[i][1] position respectively.
- */
- for (i = 0; i < b1->ndatums; i++)
- Assert((b1->datums[i][0] == b2->datums[i][0] &&
- b1->datums[i][1] == b2->datums[i][1]));
-#endif
- }
- else
- {
- for (i = 0; i < b1->ndatums; i++)
- {
- int j;
-
- for (j = 0; j < partnatts; j++)
- {
- /* For range partitions, the bounds might not be finite. */
- if (b1->kind != NULL)
- {
- /* The different kinds of bound all differ from each other */
- if (b1->kind[i][j] != b2->kind[i][j])
- return false;
+ List *result = NIL;
+ Relation inhRel;
- /*
- * Non-finite bounds are equal without further
- * examination.
- */
- if (b1->kind[i][j] != PARTITION_RANGE_DATUM_VALUE)
- continue;
- }
+ inhRel = heap_open(InheritsRelationId, AccessShareLock);
- /*
- * Compare the actual values. Note that it would be both
- * incorrect and unsafe to invoke the comparison operator
- * derived from the partitioning specification here. It would
- * be incorrect because we want the relcache entry to be
- * updated for ANY change to the partition bounds, not just
- * those that the partitioning operator thinks are
- * significant. It would be unsafe because we might reach
- * this code in the context of an aborted transaction, and an
- * arbitrary partitioning operator might not be safe in that
- * context. datumIsEqual() should be simple enough to be
- * safe.
- */
- if (!datumIsEqual(b1->datums[i][j], b2->datums[i][j],
- parttypbyval[j], parttyplen[j]))
- return false;
- }
+ get_partition_ancestors_worker(inhRel, relid, &result);
- if (b1->indexes[i] != b2->indexes[i])
- return false;
- }
+ heap_close(inhRel, AccessShareLock);
- /* There are ndatums+1 indexes in case of range partitions */
- if (b1->strategy == PARTITION_STRATEGY_RANGE &&
- b1->indexes[i] != b2->indexes[i])
- return false;
- }
- return true;
+ return result;
}
/*
- * Return a copy of given PartitionBoundInfo structure. The data types of bounds
- * are described by given partition key specification.
+ * get_partition_ancestors_worker
+ * recursive worker for get_partition_ancestors
*/
-PartitionBoundInfo
-partition_bounds_copy(PartitionBoundInfo src,
- PartitionKey key)
+static void
+get_partition_ancestors_worker(Relation inhRel, Oid relid, List **ancestors)
{
- PartitionBoundInfo dest;
- int i;
- int ndatums;
- int partnatts;
- int num_indexes;
-
- dest = (PartitionBoundInfo) palloc(sizeof(PartitionBoundInfoData));
-
- dest->strategy = src->strategy;
- ndatums = dest->ndatums = src->ndatums;
- partnatts = key->partnatts;
-
- num_indexes = get_partition_bound_num_indexes(src);
-
- /* List partitioned tables have only a single partition key. */
- Assert(key->strategy != PARTITION_STRATEGY_LIST || partnatts == 1);
-
- dest->datums = (Datum **) palloc(sizeof(Datum *) * ndatums);
-
- if (src->kind != NULL)
- {
- dest->kind = (PartitionRangeDatumKind **) palloc(ndatums *
- sizeof(PartitionRangeDatumKind *));
- for (i = 0; i < ndatums; i++)
- {
- dest->kind[i] = (PartitionRangeDatumKind *) palloc(partnatts *
- sizeof(PartitionRangeDatumKind));
-
- memcpy(dest->kind[i], src->kind[i],
- sizeof(PartitionRangeDatumKind) * key->partnatts);
- }
- }
- else
- dest->kind = NULL;
-
- for (i = 0; i < ndatums; i++)
- {
- int j;
-
- /*
- * For a corresponding to hash partition, datums array will have two
- * elements - modulus and remainder.
- */
- bool hash_part = (key->strategy == PARTITION_STRATEGY_HASH);
- int natts = hash_part ? 2 : partnatts;
-
- dest->datums[i] = (Datum *) palloc(sizeof(Datum) * natts);
-
- for (j = 0; j < natts; j++)
- {
- bool byval;
- int typlen;
-
- if (hash_part)
- {
- typlen = sizeof(int32); /* Always int4 */
- byval = true; /* int4 is pass-by-value */
- }
- else
- {
- byval = key->parttypbyval[j];
- typlen = key->parttyplen[j];
- }
-
- if (dest->kind == NULL ||
- dest->kind[i][j] == PARTITION_RANGE_DATUM_VALUE)
- dest->datums[i][j] = datumCopy(src->datums[i][j],
- byval, typlen);
- }
- }
-
- dest->indexes = (int *) palloc(sizeof(int) * num_indexes);
- memcpy(dest->indexes, src->indexes, sizeof(int) * num_indexes);
+ Oid parentOid;
- dest->null_index = src->null_index;
- dest->default_index = src->default_index;
+ /* Recursion ends at the topmost level, ie., when there's no parent */
+ parentOid = get_partition_parent_worker(inhRel, relid);
+ if (parentOid == InvalidOid)
+ return;
- return dest;
+ *ancestors = lappend_oid(*ancestors, parentOid);
+ get_partition_ancestors_worker(inhRel, parentOid, ancestors);
}
/*
- * check_new_partition_bound
+ * map_partition_varattnos - maps varattno of any Vars in expr from the
+ * attno's of 'from_rel' to the attno's of 'to_rel' partition, each of which
+ * may be either a leaf partition or a partitioned table, but both of which
+ * must be from the same partitioning hierarchy.
+ *
+ * Even though all of the same column names must be present in all relations
+ * in the hierarchy, and they must also have the same types, the attnos may
+ * be different.
*
- * Checks if the new partition's bound overlaps any of the existing partitions
- * of parent. Also performs additional checks as necessary per strategy.
- */
-void
-check_new_partition_bound(char *relname, Relation parent,
- PartitionBoundSpec *spec)
-{
- PartitionKey key = RelationGetPartitionKey(parent);
- PartitionDesc partdesc = RelationGetPartitionDesc(parent);
- PartitionBoundInfo boundinfo = partdesc->boundinfo;
- ParseState *pstate = make_parsestate(NULL);
- int with = -1;
- bool overlap = false;
-
- if (spec->is_default)
- {
- /*
- * The default partition bound never conflicts with any other
- * partition's; if that's what we're attaching, the only possible
- * problem is that one already exists, so check for that and we're
- * done.
- */
- if (boundinfo == NULL || !partition_bound_has_default(boundinfo))
- return;
-
- /* Default partition already exists, error out. */
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
- errmsg("partition \"%s\" conflicts with existing default partition \"%s\"",
- relname, get_rel_name(partdesc->oids[boundinfo->default_index])),
- parser_errposition(pstate, spec->location)));
- }
-
- switch (key->strategy)
- {
- case PARTITION_STRATEGY_HASH:
- {
- Assert(spec->strategy == PARTITION_STRATEGY_HASH);
- Assert(spec->remainder >= 0 && spec->remainder < spec->modulus);
-
- if (partdesc->nparts > 0)
- {
- PartitionBoundInfo boundinfo = partdesc->boundinfo;
- Datum **datums = boundinfo->datums;
- int ndatums = boundinfo->ndatums;
- int greatest_modulus;
- int remainder;
- int offset;
- bool valid_modulus = true;
- int prev_modulus, /* Previous largest modulus */
- next_modulus; /* Next largest modulus */
-
- /*
- * Check rule that every modulus must be a factor of the
- * next larger modulus. For example, if you have a bunch
- * of partitions that all have modulus 5, you can add a
- * new partition with modulus 10 or a new partition with
- * modulus 15, but you cannot add both a partition with
- * modulus 10 and a partition with modulus 15, because 10
- * is not a factor of 15.
- *
- * Get the greatest (modulus, remainder) pair contained in
- * boundinfo->datums that is less than or equal to the
- * (spec->modulus, spec->remainder) pair.
- */
- offset = partition_hash_bsearch(boundinfo,
- spec->modulus,
- spec->remainder);
- if (offset < 0)
- {
- next_modulus = DatumGetInt32(datums[0][0]);
- valid_modulus = (next_modulus % spec->modulus) == 0;
- }
- else
- {
- prev_modulus = DatumGetInt32(datums[offset][0]);
- valid_modulus = (spec->modulus % prev_modulus) == 0;
-
- if (valid_modulus && (offset + 1) < ndatums)
- {
- next_modulus = DatumGetInt32(datums[offset + 1][0]);
- valid_modulus = (next_modulus % spec->modulus) == 0;
- }
- }
-
- if (!valid_modulus)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
- errmsg("every hash partition modulus must be a factor of the next larger modulus")));
-
- greatest_modulus = get_hash_partition_greatest_modulus(boundinfo);
- remainder = spec->remainder;
-
- /*
- * Normally, the lowest remainder that could conflict with
- * the new partition is equal to the remainder specified
- * for the new partition, but when the new partition has a
- * modulus higher than any used so far, we need to adjust.
- */
- if (remainder >= greatest_modulus)
- remainder = remainder % greatest_modulus;
-
- /* Check every potentially-conflicting remainder. */
- do
- {
- if (boundinfo->indexes[remainder] != -1)
- {
- overlap = true;
- with = boundinfo->indexes[remainder];
- break;
- }
- remainder += spec->modulus;
- } while (remainder < greatest_modulus);
- }
-
- break;
- }
-
- case PARTITION_STRATEGY_LIST:
- {
- Assert(spec->strategy == PARTITION_STRATEGY_LIST);
-
- if (partdesc->nparts > 0)
- {
- ListCell *cell;
-
- Assert(boundinfo &&
- boundinfo->strategy == PARTITION_STRATEGY_LIST &&
- (boundinfo->ndatums > 0 ||
- partition_bound_accepts_nulls(boundinfo) ||
- partition_bound_has_default(boundinfo)));
-
- foreach(cell, spec->listdatums)
- {
- Const *val = castNode(Const, lfirst(cell));
-
- if (!val->constisnull)
- {
- int offset;
- bool equal;
-
- offset = partition_list_bsearch(key->partsupfunc,
- key->partcollation,
- boundinfo,
- val->constvalue,
- &equal);
- if (offset >= 0 && equal)
- {
- overlap = true;
- with = boundinfo->indexes[offset];
- break;
- }
- }
- else if (partition_bound_accepts_nulls(boundinfo))
- {
- overlap = true;
- with = boundinfo->null_index;
- break;
- }
- }
- }
-
- break;
- }
-
- case PARTITION_STRATEGY_RANGE:
- {
- PartitionRangeBound *lower,
- *upper;
-
- Assert(spec->strategy == PARTITION_STRATEGY_RANGE);
- lower = make_one_range_bound(key, -1, spec->lowerdatums, true);
- upper = make_one_range_bound(key, -1, spec->upperdatums, false);
-
- /*
- * First check if the resulting range would be empty with
- * specified lower and upper bounds
- */
- if (partition_rbound_cmp(key->partnatts, key->partsupfunc,
- key->partcollation, lower->datums,
- lower->kind, true, upper) >= 0)
- {
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
- errmsg("empty range bound specified for partition \"%s\"",
- relname),
- errdetail("Specified lower bound %s is greater than or equal to upper bound %s.",
- get_range_partbound_string(spec->lowerdatums),
- get_range_partbound_string(spec->upperdatums)),
- parser_errposition(pstate, spec->location)));
- }
-
- if (partdesc->nparts > 0)
- {
- PartitionBoundInfo boundinfo = partdesc->boundinfo;
- int offset;
- bool equal;
-
- Assert(boundinfo &&
- boundinfo->strategy == PARTITION_STRATEGY_RANGE &&
- (boundinfo->ndatums > 0 ||
- partition_bound_has_default(boundinfo)));
-
- /*
- * Test whether the new lower bound (which is treated
- * inclusively as part of the new partition) lies inside
- * an existing partition, or in a gap.
- *
- * If it's inside an existing partition, the bound at
- * offset + 1 will be the upper bound of that partition,
- * and its index will be >= 0.
- *
- * If it's in a gap, the bound at offset + 1 will be the
- * lower bound of the next partition, and its index will
- * be -1. This is also true if there is no next partition,
- * since the index array is initialised with an extra -1
- * at the end.
- */
- offset = partition_range_bsearch(key->partnatts,
- key->partsupfunc,
- key->partcollation,
- boundinfo, lower,
- &equal);
-
- if (boundinfo->indexes[offset + 1] < 0)
- {
- /*
- * Check that the new partition will fit in the gap.
- * For it to fit, the new upper bound must be less
- * than or equal to the lower bound of the next
- * partition, if there is one.
- */
- if (offset + 1 < boundinfo->ndatums)
- {
- int32 cmpval;
- Datum *datums;
- PartitionRangeDatumKind *kind;
- bool is_lower;
-
- datums = boundinfo->datums[offset + 1];
- kind = boundinfo->kind[offset + 1];
- is_lower = (boundinfo->indexes[offset + 1] == -1);
-
- cmpval = partition_rbound_cmp(key->partnatts,
- key->partsupfunc,
- key->partcollation,
- datums, kind,
- is_lower, upper);
- if (cmpval < 0)
- {
- /*
- * The new partition overlaps with the
- * existing partition between offset + 1 and
- * offset + 2.
- */
- overlap = true;
- with = boundinfo->indexes[offset + 2];
- }
- }
- }
- else
- {
- /*
- * The new partition overlaps with the existing
- * partition between offset and offset + 1.
- */
- overlap = true;
- with = boundinfo->indexes[offset + 1];
- }
- }
-
- break;
- }
-
- default:
- elog(ERROR, "unexpected partition strategy: %d",
- (int) key->strategy);
- }
-
- if (overlap)
- {
- Assert(with >= 0);
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
- errmsg("partition \"%s\" would overlap partition \"%s\"",
- relname, get_rel_name(partdesc->oids[with])),
- parser_errposition(pstate, spec->location)));
- }
-}
-
-/*
- * check_default_allows_bound
- *
- * This function checks if there exists a row in the default partition that
- * would properly belong to the new partition being added. If it finds one,
- * it throws an error.
- */
-void
-check_default_allows_bound(Relation parent, Relation default_rel,
- PartitionBoundSpec *new_spec)
-{
- List *new_part_constraints;
- List *def_part_constraints;
- List *all_parts;
- ListCell *lc;
-
- new_part_constraints = (new_spec->strategy == PARTITION_STRATEGY_LIST)
- ? get_qual_for_list(parent, new_spec)
- : get_qual_for_range(parent, new_spec, false);
- def_part_constraints =
- get_proposed_default_constraint(new_part_constraints);
-
- /*
- * If the existing constraints on the default partition imply that it will
- * not contain any row that would belong to the new partition, we can
- * avoid scanning the default partition.
- */
- if (PartConstraintImpliedByRelConstraint(default_rel, def_part_constraints))
- {
- ereport(INFO,
- (errmsg("updated partition constraint for default partition \"%s\" is implied by existing constraints",
- RelationGetRelationName(default_rel))));
- return;
- }
-
- /*
- * Scan the default partition and its subpartitions, and check for rows
- * that do not satisfy the revised partition constraints.
- */
- if (default_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
- all_parts = find_all_inheritors(RelationGetRelid(default_rel),
- AccessExclusiveLock, NULL);
- else
- all_parts = list_make1_oid(RelationGetRelid(default_rel));
-
- foreach(lc, all_parts)
- {
- Oid part_relid = lfirst_oid(lc);
- Relation part_rel;
- Expr *constr;
- Expr *partition_constraint;
- EState *estate;
- HeapTuple tuple;
- ExprState *partqualstate = NULL;
- Snapshot snapshot;
- TupleDesc tupdesc;
- ExprContext *econtext;
- HeapScanDesc scan;
- MemoryContext oldCxt;
- TupleTableSlot *tupslot;
-
- /* Lock already taken above. */
- if (part_relid != RelationGetRelid(default_rel))
- {
- part_rel = heap_open(part_relid, NoLock);
-
- /*
- * If the partition constraints on default partition child imply
- * that it will not contain any row that would belong to the new
- * partition, we can avoid scanning the child table.
- */
- if (PartConstraintImpliedByRelConstraint(part_rel,
- def_part_constraints))
- {
- ereport(INFO,
- (errmsg("updated partition constraint for default partition \"%s\" is implied by existing constraints",
- RelationGetRelationName(part_rel))));
-
- heap_close(part_rel, NoLock);
- continue;
- }
- }
- else
- part_rel = default_rel;
-
- /*
- * Only RELKIND_RELATION relations (i.e. leaf partitions) need to be
- * scanned.
- */
- if (part_rel->rd_rel->relkind != RELKIND_RELATION)
- {
- if (part_rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
- ereport(WARNING,
- (errcode(ERRCODE_CHECK_VIOLATION),
- errmsg("skipped scanning foreign table \"%s\" which is a partition of default partition \"%s\"",
- RelationGetRelationName(part_rel),
- RelationGetRelationName(default_rel))));
-
- if (RelationGetRelid(default_rel) != RelationGetRelid(part_rel))
- heap_close(part_rel, NoLock);
-
- continue;
- }
-
- tupdesc = CreateTupleDescCopy(RelationGetDescr(part_rel));
- constr = linitial(def_part_constraints);
- partition_constraint = (Expr *)
- map_partition_varattnos((List *) constr,
- 1, part_rel, parent, NULL);
- estate = CreateExecutorState();
-
- /* Build expression execution states for partition check quals */
- partqualstate = ExecPrepareExpr(partition_constraint, estate);
-
- econtext = GetPerTupleExprContext(estate);
- snapshot = RegisterSnapshot(GetLatestSnapshot());
- scan = heap_beginscan(part_rel, snapshot, 0, NULL);
- tupslot = MakeSingleTupleTableSlot(tupdesc);
-
- /*
- * Switch to per-tuple memory context and reset it for each tuple
- * produced, so we don't leak memory.
- */
- oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
-
- while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
- {
- ExecStoreTuple(tuple, tupslot, InvalidBuffer, false);
- econtext->ecxt_scantuple = tupslot;
-
- if (!ExecCheck(partqualstate, econtext))
- ereport(ERROR,
- (errcode(ERRCODE_CHECK_VIOLATION),
- errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
- RelationGetRelationName(default_rel))));
-
- ResetExprContext(econtext);
- CHECK_FOR_INTERRUPTS();
- }
-
- MemoryContextSwitchTo(oldCxt);
- heap_endscan(scan);
- UnregisterSnapshot(snapshot);
- ExecDropSingleTupleTableSlot(tupslot);
- FreeExecutorState(estate);
-
- if (RelationGetRelid(default_rel) != RelationGetRelid(part_rel))
- heap_close(part_rel, NoLock); /* keep the lock until commit */
- }
-}
-
-/*
- * get_partition_parent
- * Obtain direct parent of given relation
- *
- * Returns inheritance parent of a partition by scanning pg_inherits
- *
- * Note: Because this function assumes that the relation whose OID is passed
- * as an argument will have precisely one parent, it should only be called
- * when it is known that the relation is a partition.
- */
-Oid
-get_partition_parent(Oid relid)
-{
- Relation catalogRelation;
- Oid result;
-
- catalogRelation = heap_open(InheritsRelationId, AccessShareLock);
-
- result = get_partition_parent_worker(catalogRelation, relid);
-
- if (!OidIsValid(result))
- elog(ERROR, "could not find tuple for parent of relation %u", relid);
-
- heap_close(catalogRelation, AccessShareLock);
-
- return result;
-}
-
-/*
- * get_partition_parent_worker
- * Scan the pg_inherits relation to return the OID of the parent of the
- * given relation
- */
-static Oid
-get_partition_parent_worker(Relation inhRel, Oid relid)
-{
- SysScanDesc scan;
- ScanKeyData key[2];
- Oid result = InvalidOid;
- HeapTuple tuple;
-
- ScanKeyInit(&key[0],
- Anum_pg_inherits_inhrelid,
- BTEqualStrategyNumber, F_OIDEQ,
- ObjectIdGetDatum(relid));
- ScanKeyInit(&key[1],
- Anum_pg_inherits_inhseqno,
- BTEqualStrategyNumber, F_INT4EQ,
- Int32GetDatum(1));
-
- scan = systable_beginscan(inhRel, InheritsRelidSeqnoIndexId, true,
- NULL, 2, key);
- tuple = systable_getnext(scan);
- if (HeapTupleIsValid(tuple))
- {
- Form_pg_inherits form = (Form_pg_inherits) GETSTRUCT(tuple);
-
- result = form->inhparent;
- }
-
- systable_endscan(scan);
-
- return result;
-}
-
-/*
- * get_partition_ancestors
- * Obtain ancestors of given relation
- *
- * Returns a list of ancestors of the given relation.
- *
- * Note: Because this function assumes that the relation whose OID is passed
- * as an argument and each ancestor will have precisely one parent, it should
- * only be called when it is known that the relation is a partition.
- */
-List *
-get_partition_ancestors(Oid relid)
-{
- List *result = NIL;
- Relation inhRel;
-
- inhRel = heap_open(InheritsRelationId, AccessShareLock);
-
- get_partition_ancestors_worker(inhRel, relid, &result);
-
- heap_close(inhRel, AccessShareLock);
-
- return result;
-}
-
-/*
- * get_partition_ancestors_worker
- * recursive worker for get_partition_ancestors
- */
-static void
-get_partition_ancestors_worker(Relation inhRel, Oid relid, List **ancestors)
-{
- Oid parentOid;
-
- /* Recursion ends at the topmost level, ie., when there's no parent */
- parentOid = get_partition_parent_worker(inhRel, relid);
- if (parentOid == InvalidOid)
- return;
-
- *ancestors = lappend_oid(*ancestors, parentOid);
- get_partition_ancestors_worker(inhRel, parentOid, ancestors);
-}
-
-/*
- * get_qual_from_partbound
- * Given a parser node for partition bound, return the list of executable
- * expressions as partition constraint
- */
-List *
-get_qual_from_partbound(Relation rel, Relation parent,
- PartitionBoundSpec *spec)
-{
- PartitionKey key = RelationGetPartitionKey(parent);
- List *my_qual = NIL;
-
- Assert(key != NULL);
-
- switch (key->strategy)
- {
- case PARTITION_STRATEGY_HASH:
- Assert(spec->strategy == PARTITION_STRATEGY_HASH);
- my_qual = get_qual_for_hash(parent, spec);
- break;
-
- case PARTITION_STRATEGY_LIST:
- Assert(spec->strategy == PARTITION_STRATEGY_LIST);
- my_qual = get_qual_for_list(parent, spec);
- break;
-
- case PARTITION_STRATEGY_RANGE:
- Assert(spec->strategy == PARTITION_STRATEGY_RANGE);
- my_qual = get_qual_for_range(parent, spec, false);
- break;
-
- default:
- elog(ERROR, "unexpected partition strategy: %d",
- (int) key->strategy);
- }
-
- return my_qual;
-}
-
-/*
- * map_partition_varattnos - maps varattno of any Vars in expr from the
- * attno's of 'from_rel' to the attno's of 'to_rel' partition, each of which
- * may be either a leaf partition or a partitioned table, but both of which
- * must be from the same partitioning hierarchy.
- *
- * Even though all of the same column names must be present in all relations
- * in the hierarchy, and they must also have the same types, the attnos may
- * be different.
- *
- * If found_whole_row is not NULL, *found_whole_row returns whether a
- * whole-row variable was found in the input expression.
- *
- * Note: this will work on any node tree, so really the argument and result
- * should be declared "Node *". But a substantial majority of the callers
- * are working on Lists, so it's less messy to do the casts internally.
- */
-List *
-map_partition_varattnos(List *expr, int fromrel_varno,
- Relation to_rel, Relation from_rel,
- bool *found_whole_row)
-{
- bool my_found_whole_row = false;
-
- if (expr != NIL)
- {
- AttrNumber *part_attnos;
-
- part_attnos = convert_tuples_by_name_map(RelationGetDescr(to_rel),
- RelationGetDescr(from_rel),
- gettext_noop("could not convert row type"));
- expr = (List *) map_variable_attnos((Node *) expr,
- fromrel_varno, 0,
- part_attnos,
- RelationGetDescr(from_rel)->natts,
- RelationGetForm(to_rel)->reltype,
- &my_found_whole_row);
- }
-
- if (found_whole_row)
- *found_whole_row = my_found_whole_row;
-
- return expr;
-}
-
-/*
- * RelationGetPartitionQual
- *
- * Returns a list of partition quals
+ * If found_whole_row is not NULL, *found_whole_row returns whether a
+ * whole-row variable was found in the input expression.
+ *
+ * Note: this will work on any node tree, so really the argument and result
+ * should be declared "Node *". But a substantial majority of the callers
+ * are working on Lists, so it's less messy to do the casts internally.
*/
List *
-RelationGetPartitionQual(Relation rel)
-{
- /* Quick exit */
- if (!rel->rd_rel->relispartition)
- return NIL;
-
- return generate_partition_qual(rel);
-}
-
-/*
- * get_partition_qual_relid
- *
- * Returns an expression tree describing the passed-in relation's partition
- * constraint. If there is no partition constraint returns NULL; this can
- * happen if the default partition is the only partition.
- */
-Expr *
-get_partition_qual_relid(Oid relid)
-{
- Relation rel = heap_open(relid, AccessShareLock);
- Expr *result = NULL;
- List *and_args;
-
- /* Do the work only if this relation is a partition. */
- if (rel->rd_rel->relispartition)
- {
- and_args = generate_partition_qual(rel);
-
- if (and_args == NIL)
- result = NULL;
- else if (list_length(and_args) > 1)
- result = makeBoolExpr(AND_EXPR, and_args, -1);
- else
- result = linitial(and_args);
- }
-
- /* Keep the lock. */
- heap_close(rel, NoLock);
-
- return result;
-}
-
-
-/*
- * get_partition_operator
- *
- * Return oid of the operator of given strategy for a given partition key
- * column.
- */
-static Oid
-get_partition_operator(PartitionKey key, int col, StrategyNumber strategy,
- bool *need_relabel)
-{
- Oid operoid;
-
- /*
- * First check if there exists an operator of the given strategy, with
- * this column's type as both its lefttype and righttype, in the
- * partitioning operator family specified for the column.
- */
- operoid = get_opfamily_member(key->partopfamily[col],
- key->parttypid[col],
- key->parttypid[col],
- strategy);
-
- /*
- * If one doesn't exist, we must resort to using an operator in the same
- * operator family but with the operator class declared input type. It is
- * OK to do so, because the column's type is known to be binary-coercible
- * with the operator class input type (otherwise, the operator class in
- * question would not have been accepted as the partitioning operator
- * class). We must however inform the caller to wrap the non-Const
- * expression with a RelabelType node to denote the implicit coercion. It
- * ensures that the resulting expression structurally matches similarly
- * processed expressions within the optimizer.
- */
- if (!OidIsValid(operoid))
- {
- operoid = get_opfamily_member(key->partopfamily[col],
- key->partopcintype[col],
- key->partopcintype[col],
- strategy);
- if (!OidIsValid(operoid))
- elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
- strategy, key->partopcintype[col], key->partopcintype[col],
- key->partopfamily[col]);
- *need_relabel = true;
- }
- else
- *need_relabel = false;
-
- return operoid;
-}
-
-/*
- * make_partition_op_expr
- * Returns an Expr for the given partition key column with arg1 and
- * arg2 as its leftop and rightop, respectively
- */
-static Expr *
-make_partition_op_expr(PartitionKey key, int keynum,
- uint16 strategy, Expr *arg1, Expr *arg2)
-{
- Oid operoid;
- bool need_relabel = false;
- Expr *result = NULL;
-
- /* Get the correct btree operator for this partitioning column */
- operoid = get_partition_operator(key, keynum, strategy, &need_relabel);
-
- /*
- * Chosen operator may be such that the non-Const operand needs to be
- * coerced, so apply the same; see the comment in
- * get_partition_operator().
- */
- if (!IsA(arg1, Const) &&
- (need_relabel ||
- key->partcollation[keynum] != key->parttypcoll[keynum]))
- arg1 = (Expr *) makeRelabelType(arg1,
- key->partopcintype[keynum],
- -1,
- key->partcollation[keynum],
- COERCE_EXPLICIT_CAST);
-
- /* Generate the actual expression */
- switch (key->strategy)
- {
- case PARTITION_STRATEGY_LIST:
- {
- List *elems = (List *) arg2;
- int nelems = list_length(elems);
-
- Assert(nelems >= 1);
- Assert(keynum == 0);
-
- if (nelems > 1 &&
- !type_is_array(key->parttypid[keynum]))
- {
- ArrayExpr *arrexpr;
- ScalarArrayOpExpr *saopexpr;
-
- /* Construct an ArrayExpr for the right-hand inputs */
- arrexpr = makeNode(ArrayExpr);
- arrexpr->array_typeid =
- get_array_type(key->parttypid[keynum]);
- arrexpr->array_collid = key->parttypcoll[keynum];
- arrexpr->element_typeid = key->parttypid[keynum];
- arrexpr->elements = elems;
- arrexpr->multidims = false;
- arrexpr->location = -1;
-
- /* Build leftop = ANY (rightop) */
- saopexpr = makeNode(ScalarArrayOpExpr);
- saopexpr->opno = operoid;
- saopexpr->opfuncid = get_opcode(operoid);
- saopexpr->useOr = true;
- saopexpr->inputcollid = key->partcollation[keynum];
- saopexpr->args = list_make2(arg1, arrexpr);
- saopexpr->location = -1;
-
- result = (Expr *) saopexpr;
- }
- else
- {
- List *elemops = NIL;
- ListCell *lc;
-
- foreach (lc, elems)
- {
- Expr *elem = lfirst(lc),
- *elemop;
-
- elemop = make_opclause(operoid,
- BOOLOID,
- false,
- arg1, elem,
- InvalidOid,
- key->partcollation[keynum]);
- elemops = lappend(elemops, elemop);
- }
-
- result = nelems > 1 ? makeBoolExpr(OR_EXPR, elemops, -1) : linitial(elemops);
- }
- break;
- }
-
- case PARTITION_STRATEGY_RANGE:
- result = make_opclause(operoid,
- BOOLOID,
- false,
- arg1, arg2,
- InvalidOid,
- key->partcollation[keynum]);
- break;
-
- default:
- elog(ERROR, "invalid partitioning strategy");
- break;
- }
-
- return result;
-}
-
-/*
- * get_qual_for_hash
- *
- * Returns a CHECK constraint expression to use as a hash partition's
- * constraint, given the parent relation and partition bound structure.
- *
- * The partition constraint for a hash partition is always a call to the
- * built-in function satisfies_hash_partition().
- */
-static List *
-get_qual_for_hash(Relation parent, PartitionBoundSpec *spec)
-{
- PartitionKey key = RelationGetPartitionKey(parent);
- FuncExpr *fexpr;
- Node *relidConst;
- Node *modulusConst;
- Node *remainderConst;
- List *args;
- ListCell *partexprs_item;
- int i;
-
- /* Fixed arguments. */
- relidConst = (Node *) makeConst(OIDOID,
- -1,
- InvalidOid,
- sizeof(Oid),
- ObjectIdGetDatum(RelationGetRelid(parent)),
- false,
- true);
-
- modulusConst = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(spec->modulus),
- false,
- true);
-
- remainderConst = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(spec->remainder),
- false,
- true);
-
- args = list_make3(relidConst, modulusConst, remainderConst);
- partexprs_item = list_head(key->partexprs);
-
- /* Add an argument for each key column. */
- for (i = 0; i < key->partnatts; i++)
- {
- Node *keyCol;
-
- /* Left operand */
- if (key->partattrs[i] != 0)
- {
- keyCol = (Node *) makeVar(1,
- key->partattrs[i],
- key->parttypid[i],
- key->parttypmod[i],
- key->parttypcoll[i],
- 0);
- }
- else
- {
- keyCol = (Node *) copyObject(lfirst(partexprs_item));
- partexprs_item = lnext(partexprs_item);
- }
-
- args = lappend(args, keyCol);
- }
-
- fexpr = makeFuncExpr(F_SATISFIES_HASH_PARTITION,
- BOOLOID,
- args,
- InvalidOid,
- InvalidOid,
- COERCE_EXPLICIT_CALL);
-
- return list_make1(fexpr);
-}
-
-/*
- * get_qual_for_list
- *
- * Returns an implicit-AND list of expressions to use as a list partition's
- * constraint, given the parent relation and partition bound structure.
- *
- * The function returns NIL for a default partition when it's the only
- * partition since in that case there is no constraint.
- */
-static List *
-get_qual_for_list(Relation parent, PartitionBoundSpec *spec)
-{
- PartitionKey key = RelationGetPartitionKey(parent);
- List *result;
- Expr *keyCol;
- Expr *opexpr;
- NullTest *nulltest;
- ListCell *cell;
- List *elems = NIL;
- bool list_has_null = false;
-
- /*
- * Only single-column list partitioning is supported, so we are worried
- * only about the partition key with index 0.
- */
- Assert(key->partnatts == 1);
-
- /* Construct Var or expression representing the partition column */
- if (key->partattrs[0] != 0)
- keyCol = (Expr *) makeVar(1,
- key->partattrs[0],
- key->parttypid[0],
- key->parttypmod[0],
- key->parttypcoll[0],
- 0);
- else
- keyCol = (Expr *) copyObject(linitial(key->partexprs));
-
- /*
- * For default list partition, collect datums for all the partitions. The
- * default partition constraint should check that the partition key is
- * equal to none of those.
- */
- if (spec->is_default)
- {
- int i;
- int ndatums = 0;
- PartitionDesc pdesc = RelationGetPartitionDesc(parent);
- PartitionBoundInfo boundinfo = pdesc->boundinfo;
-
- if (boundinfo)
- {
- ndatums = boundinfo->ndatums;
-
- if (partition_bound_accepts_nulls(boundinfo))
- list_has_null = true;
- }
-
- /*
- * If default is the only partition, there need not be any partition
- * constraint on it.
- */
- if (ndatums == 0 && !list_has_null)
- return NIL;
-
- for (i = 0; i < ndatums; i++)
- {
- Const *val;
-
- /*
- * Construct Const from known-not-null datum. We must be careful
- * to copy the value, because our result has to be able to outlive
- * the relcache entry we're copying from.
- */
- val = makeConst(key->parttypid[0],
- key->parttypmod[0],
- key->parttypcoll[0],
- key->parttyplen[0],
- datumCopy(*boundinfo->datums[i],
- key->parttypbyval[0],
- key->parttyplen[0]),
- false, /* isnull */
- key->parttypbyval[0]);
-
- elems = lappend(elems, val);
- }
- }
- else
- {
- /*
- * Create list of Consts for the allowed values, excluding any nulls.
- */
- foreach(cell, spec->listdatums)
- {
- Const *val = castNode(Const, lfirst(cell));
-
- if (val->constisnull)
- list_has_null = true;
- else
- elems = lappend(elems, copyObject(val));
- }
- }
-
- if (elems)
- {
- /*
- * Generate the operator expression from the non-null partition
- * values.
- */
- opexpr = make_partition_op_expr(key, 0, BTEqualStrategyNumber,
- keyCol, (Expr *) elems);
- }
- else
- {
- /*
- * If there are no partition values, we don't need an operator
- * expression.
- */
- opexpr = NULL;
- }
-
- if (!list_has_null)
- {
- /*
- * Gin up a "col IS NOT NULL" test that will be AND'd with the main
- * expression. This might seem redundant, but the partition routing
- * machinery needs it.
- */
- nulltest = makeNode(NullTest);
- nulltest->arg = keyCol;
- nulltest->nulltesttype = IS_NOT_NULL;
- nulltest->argisrow = false;
- nulltest->location = -1;
-
- result = opexpr ? list_make2(nulltest, opexpr) : list_make1(nulltest);
- }
- else
- {
- /*
- * Gin up a "col IS NULL" test that will be OR'd with the main
- * expression.
- */
- nulltest = makeNode(NullTest);
- nulltest->arg = keyCol;
- nulltest->nulltesttype = IS_NULL;
- nulltest->argisrow = false;
- nulltest->location = -1;
-
- if (opexpr)
- {
- Expr *or;
-
- or = makeBoolExpr(OR_EXPR, list_make2(nulltest, opexpr), -1);
- result = list_make1(or);
- }
- else
- result = list_make1(nulltest);
- }
-
- /*
- * Note that, in general, applying NOT to a constraint expression doesn't
- * necessarily invert the set of rows it accepts, because NOT (NULL) is
- * NULL. However, the partition constraints we construct here never
- * evaluate to NULL, so applying NOT works as intended.
- */
- if (spec->is_default)
- {
- result = list_make1(make_ands_explicit(result));
- result = list_make1(makeBoolExpr(NOT_EXPR, result, -1));
- }
-
- return result;
-}
-
-/*
- * get_range_key_properties
- * Returns range partition key information for a given column
- *
- * This is a subroutine for get_qual_for_range, and its API is pretty
- * specialized to that caller.
- *
- * Constructs an Expr for the key column (returned in *keyCol) and Consts
- * for the lower and upper range limits (returned in *lower_val and
- * *upper_val). For MINVALUE/MAXVALUE limits, NULL is returned instead of
- * a Const. All of these structures are freshly palloc'd.
- *
- * *partexprs_item points to the cell containing the next expression in
- * the key->partexprs list, or NULL. It may be advanced upon return.
- */
-static void
-get_range_key_properties(PartitionKey key, int keynum,
- PartitionRangeDatum *ldatum,
- PartitionRangeDatum *udatum,
- ListCell **partexprs_item,
- Expr **keyCol,
- Const **lower_val, Const **upper_val)
-{
- /* Get partition key expression for this column */
- if (key->partattrs[keynum] != 0)
- {
- *keyCol = (Expr *) makeVar(1,
- key->partattrs[keynum],
- key->parttypid[keynum],
- key->parttypmod[keynum],
- key->parttypcoll[keynum],
- 0);
- }
- else
- {
- if (*partexprs_item == NULL)
- elog(ERROR, "wrong number of partition key expressions");
- *keyCol = copyObject(lfirst(*partexprs_item));
- *partexprs_item = lnext(*partexprs_item);
- }
-
- /* Get appropriate Const nodes for the bounds */
- if (ldatum->kind == PARTITION_RANGE_DATUM_VALUE)
- *lower_val = castNode(Const, copyObject(ldatum->value));
- else
- *lower_val = NULL;
-
- if (udatum->kind == PARTITION_RANGE_DATUM_VALUE)
- *upper_val = castNode(Const, copyObject(udatum->value));
- else
- *upper_val = NULL;
-}
-
- /*
- * get_range_nulltest
- *
- * A non-default range partition table does not currently allow partition
- * keys to be null, so emit an IS NOT NULL expression for each key column.
- */
-static List *
-get_range_nulltest(PartitionKey key)
-{
- List *result = NIL;
- NullTest *nulltest;
- ListCell *partexprs_item;
- int i;
-
- partexprs_item = list_head(key->partexprs);
- for (i = 0; i < key->partnatts; i++)
- {
- Expr *keyCol;
-
- if (key->partattrs[i] != 0)
- {
- keyCol = (Expr *) makeVar(1,
- key->partattrs[i],
- key->parttypid[i],
- key->parttypmod[i],
- key->parttypcoll[i],
- 0);
- }
- else
- {
- if (partexprs_item == NULL)
- elog(ERROR, "wrong number of partition key expressions");
- keyCol = copyObject(lfirst(partexprs_item));
- partexprs_item = lnext(partexprs_item);
- }
-
- nulltest = makeNode(NullTest);
- nulltest->arg = keyCol;
- nulltest->nulltesttype = IS_NOT_NULL;
- nulltest->argisrow = false;
- nulltest->location = -1;
- result = lappend(result, nulltest);
- }
-
- return result;
-}
-
-/*
- * get_qual_for_range
- *
- * Returns an implicit-AND list of expressions to use as a range partition's
- * constraint, given the parent relation and partition bound structure.
- *
- * For a multi-column range partition key, say (a, b, c), with (al, bl, cl)
- * as the lower bound tuple and (au, bu, cu) as the upper bound tuple, we
- * generate an expression tree of the following form:
- *
- * (a IS NOT NULL) and (b IS NOT NULL) and (c IS NOT NULL)
- * AND
- * (a > al OR (a = al AND b > bl) OR (a = al AND b = bl AND c >= cl))
- * AND
- * (a < au OR (a = au AND b < bu) OR (a = au AND b = bu AND c < cu))
- *
- * It is often the case that a prefix of lower and upper bound tuples contains
- * the same values, for example, (al = au), in which case, we will emit an
- * expression tree of the following form:
- *
- * (a IS NOT NULL) and (b IS NOT NULL) and (c IS NOT NULL)
- * AND
- * (a = al)
- * AND
- * (b > bl OR (b = bl AND c >= cl))
- * AND
- * (b < bu) OR (b = bu AND c < cu))
- *
- * If a bound datum is either MINVALUE or MAXVALUE, these expressions are
- * simplified using the fact that any value is greater than MINVALUE and less
- * than MAXVALUE. So, for example, if cu = MAXVALUE, c < cu is automatically
- * true, and we need not emit any expression for it, and the last line becomes
- *
- * (b < bu) OR (b = bu), which is simplified to (b <= bu)
- *
- * In most common cases with only one partition column, say a, the following
- * expression tree will be generated: a IS NOT NULL AND a >= al AND a < au
- *
- * For default partition, it returns the negation of the constraints of all
- * the other partitions.
- *
- * External callers should pass for_default as false; we set it to true only
- * when recursing.
- */
-static List *
-get_qual_for_range(Relation parent, PartitionBoundSpec *spec,
- bool for_default)
-{
- List *result = NIL;
- ListCell *cell1,
- *cell2,
- *partexprs_item,
- *partexprs_item_saved;
- int i,
- j;
- PartitionRangeDatum *ldatum,
- *udatum;
- PartitionKey key = RelationGetPartitionKey(parent);
- Expr *keyCol;
- Const *lower_val,
- *upper_val;
- List *lower_or_arms,
- *upper_or_arms;
- int num_or_arms,
- current_or_arm;
- ListCell *lower_or_start_datum,
- *upper_or_start_datum;
- bool need_next_lower_arm,
- need_next_upper_arm;
-
- if (spec->is_default)
- {
- List *or_expr_args = NIL;
- PartitionDesc pdesc = RelationGetPartitionDesc(parent);
- Oid *inhoids = pdesc->oids;
- int nparts = pdesc->nparts,
- i;
-
- for (i = 0; i < nparts; i++)
- {
- Oid inhrelid = inhoids[i];
- HeapTuple tuple;
- Datum datum;
- bool isnull;
- PartitionBoundSpec *bspec;
-
- tuple = SearchSysCache1(RELOID, inhrelid);
- if (!HeapTupleIsValid(tuple))
- elog(ERROR, "cache lookup failed for relation %u", inhrelid);
-
- datum = SysCacheGetAttr(RELOID, tuple,
- Anum_pg_class_relpartbound,
- &isnull);
-
- Assert(!isnull);
- bspec = (PartitionBoundSpec *)
- stringToNode(TextDatumGetCString(datum));
- if (!IsA(bspec, PartitionBoundSpec))
- elog(ERROR, "expected PartitionBoundSpec");
-
- if (!bspec->is_default)
- {
- List *part_qual;
-
- part_qual = get_qual_for_range(parent, bspec, true);
-
- /*
- * AND the constraints of the partition and add to
- * or_expr_args
- */
- or_expr_args = lappend(or_expr_args, list_length(part_qual) > 1
- ? makeBoolExpr(AND_EXPR, part_qual, -1)
- : linitial(part_qual));
- }
- ReleaseSysCache(tuple);
- }
-
- if (or_expr_args != NIL)
- {
- Expr *other_parts_constr;
-
- /*
- * Combine the constraints obtained for non-default partitions
- * using OR. As requested, each of the OR's args doesn't include
- * the NOT NULL test for partition keys (which is to avoid its
- * useless repetition). Add the same now.
- */
- other_parts_constr =
- makeBoolExpr(AND_EXPR,
- lappend(get_range_nulltest(key),
- list_length(or_expr_args) > 1
- ? makeBoolExpr(OR_EXPR, or_expr_args,
- -1)
- : linitial(or_expr_args)),
- -1);
-
- /*
- * Finally, the default partition contains everything *NOT*
- * contained in the non-default partitions.
- */
- result = list_make1(makeBoolExpr(NOT_EXPR,
- list_make1(other_parts_constr), -1));
- }
-
- return result;
- }
-
- lower_or_start_datum = list_head(spec->lowerdatums);
- upper_or_start_datum = list_head(spec->upperdatums);
- num_or_arms = key->partnatts;
-
- /*
- * If it is the recursive call for default, we skip the get_range_nulltest
- * to avoid accumulating the NullTest on the same keys for each partition.
- */
- if (!for_default)
- result = get_range_nulltest(key);
-
- /*
- * Iterate over the key columns and check if the corresponding lower and
- * upper datums are equal using the btree equality operator for the
- * column's type. If equal, we emit single keyCol = common_value
- * expression. Starting from the first column for which the corresponding
- * lower and upper bound datums are not equal, we generate OR expressions
- * as shown in the function's header comment.
- */
- i = 0;
- partexprs_item = list_head(key->partexprs);
- partexprs_item_saved = partexprs_item; /* placate compiler */
- forboth(cell1, spec->lowerdatums, cell2, spec->upperdatums)
- {
- EState *estate;
- MemoryContext oldcxt;
- Expr *test_expr;
- ExprState *test_exprstate;
- Datum test_result;
- bool isNull;
-
- ldatum = castNode(PartitionRangeDatum, lfirst(cell1));
- udatum = castNode(PartitionRangeDatum, lfirst(cell2));
-
- /*
- * Since get_range_key_properties() modifies partexprs_item, and we
- * might need to start over from the previous expression in the later
- * part of this function, save away the current value.
- */
- partexprs_item_saved = partexprs_item;
-
- get_range_key_properties(key, i, ldatum, udatum,
- &partexprs_item,
- &keyCol,
- &lower_val, &upper_val);
-
- /*
- * If either value is NULL, the corresponding partition bound is
- * either MINVALUE or MAXVALUE, and we treat them as unequal, because
- * even if they're the same, there is no common value to equate the
- * key column with.
- */
- if (!lower_val || !upper_val)
- break;
-
- /* Create the test expression */
- estate = CreateExecutorState();
- oldcxt = MemoryContextSwitchTo(estate->es_query_cxt);
- test_expr = make_partition_op_expr(key, i, BTEqualStrategyNumber,
- (Expr *) lower_val,
- (Expr *) upper_val);
- fix_opfuncids((Node *) test_expr);
- test_exprstate = ExecInitExpr(test_expr, NULL);
- test_result = ExecEvalExprSwitchContext(test_exprstate,
- GetPerTupleExprContext(estate),
- &isNull);
- MemoryContextSwitchTo(oldcxt);
- FreeExecutorState(estate);
-
- /* If not equal, go generate the OR expressions */
- if (!DatumGetBool(test_result))
- break;
-
- /*
- * The bounds for the last key column can't be equal, because such a
- * range partition would never be allowed to be defined (it would have
- * an empty range otherwise).
- */
- if (i == key->partnatts - 1)
- elog(ERROR, "invalid range bound specification");
-
- /* Equal, so generate keyCol = lower_val expression */
- result = lappend(result,
- make_partition_op_expr(key, i, BTEqualStrategyNumber,
- keyCol, (Expr *) lower_val));
-
- i++;
- }
-
- /* First pair of lower_val and upper_val that are not equal. */
- lower_or_start_datum = cell1;
- upper_or_start_datum = cell2;
-
- /* OR will have as many arms as there are key columns left. */
- num_or_arms = key->partnatts - i;
- current_or_arm = 0;
- lower_or_arms = upper_or_arms = NIL;
- need_next_lower_arm = need_next_upper_arm = true;
- while (current_or_arm < num_or_arms)
- {
- List *lower_or_arm_args = NIL,
- *upper_or_arm_args = NIL;
-
- /* Restart scan of columns from the i'th one */
- j = i;
- partexprs_item = partexprs_item_saved;
-
- for_both_cell(cell1, lower_or_start_datum, cell2, upper_or_start_datum)
- {
- PartitionRangeDatum *ldatum_next = NULL,
- *udatum_next = NULL;
-
- ldatum = castNode(PartitionRangeDatum, lfirst(cell1));
- if (lnext(cell1))
- ldatum_next = castNode(PartitionRangeDatum,
- lfirst(lnext(cell1)));
- udatum = castNode(PartitionRangeDatum, lfirst(cell2));
- if (lnext(cell2))
- udatum_next = castNode(PartitionRangeDatum,
- lfirst(lnext(cell2)));
- get_range_key_properties(key, j, ldatum, udatum,
- &partexprs_item,
- &keyCol,
- &lower_val, &upper_val);
-
- if (need_next_lower_arm && lower_val)
- {
- uint16 strategy;
-
- /*
- * For the non-last columns of this arm, use the EQ operator.
- * For the last column of this arm, use GT, unless this is the
- * last column of the whole bound check, or the next bound
- * datum is MINVALUE, in which case use GE.
- */
- if (j - i < current_or_arm)
- strategy = BTEqualStrategyNumber;
- else if (j == key->partnatts - 1 ||
- (ldatum_next &&
- ldatum_next->kind == PARTITION_RANGE_DATUM_MINVALUE))
- strategy = BTGreaterEqualStrategyNumber;
- else
- strategy = BTGreaterStrategyNumber;
-
- lower_or_arm_args = lappend(lower_or_arm_args,
- make_partition_op_expr(key, j,
- strategy,
- keyCol,
- (Expr *) lower_val));
- }
-
- if (need_next_upper_arm && upper_val)
- {
- uint16 strategy;
-
- /*
- * For the non-last columns of this arm, use the EQ operator.
- * For the last column of this arm, use LT, unless the next
- * bound datum is MAXVALUE, in which case use LE.
- */
- if (j - i < current_or_arm)
- strategy = BTEqualStrategyNumber;
- else if (udatum_next &&
- udatum_next->kind == PARTITION_RANGE_DATUM_MAXVALUE)
- strategy = BTLessEqualStrategyNumber;
- else
- strategy = BTLessStrategyNumber;
-
- upper_or_arm_args = lappend(upper_or_arm_args,
- make_partition_op_expr(key, j,
- strategy,
- keyCol,
- (Expr *) upper_val));
- }
-
- /*
- * Did we generate enough of OR's arguments? First arm considers
- * the first of the remaining columns, second arm considers first
- * two of the remaining columns, and so on.
- */
- ++j;
- if (j - i > current_or_arm)
- {
- /*
- * We must not emit any more arms if the new column that will
- * be considered is unbounded, or this one was.
- */
- if (!lower_val || !ldatum_next ||
- ldatum_next->kind != PARTITION_RANGE_DATUM_VALUE)
- need_next_lower_arm = false;
- if (!upper_val || !udatum_next ||
- udatum_next->kind != PARTITION_RANGE_DATUM_VALUE)
- need_next_upper_arm = false;
- break;
- }
- }
-
- if (lower_or_arm_args != NIL)
- lower_or_arms = lappend(lower_or_arms,
- list_length(lower_or_arm_args) > 1
- ? makeBoolExpr(AND_EXPR, lower_or_arm_args, -1)
- : linitial(lower_or_arm_args));
-
- if (upper_or_arm_args != NIL)
- upper_or_arms = lappend(upper_or_arms,
- list_length(upper_or_arm_args) > 1
- ? makeBoolExpr(AND_EXPR, upper_or_arm_args, -1)
- : linitial(upper_or_arm_args));
-
- /* If no work to do in the next iteration, break away. */
- if (!need_next_lower_arm && !need_next_upper_arm)
- break;
-
- ++current_or_arm;
- }
-
- /*
- * Generate the OR expressions for each of lower and upper bounds (if
- * required), and append to the list of implicitly ANDed list of
- * expressions.
- */
- if (lower_or_arms != NIL)
- result = lappend(result,
- list_length(lower_or_arms) > 1
- ? makeBoolExpr(OR_EXPR, lower_or_arms, -1)
- : linitial(lower_or_arms));
- if (upper_or_arms != NIL)
- result = lappend(result,
- list_length(upper_or_arms) > 1
- ? makeBoolExpr(OR_EXPR, upper_or_arms, -1)
- : linitial(upper_or_arms));
-
- /*
- * As noted above, for non-default, we return list with constant TRUE. If
- * the result is NIL during the recursive call for default, it implies
- * this is the only other partition which can hold every value of the key
- * except NULL. Hence we return the NullTest result skipped earlier.
- */
- if (result == NIL)
- result = for_default
- ? get_range_nulltest(key)
- : list_make1(makeBoolConst(true, false));
-
- return result;
-}
-
-/*
- * generate_partition_qual
- *
- * Generate partition predicate from rel's partition bound expression. The
- * function returns a NIL list if there is no predicate.
- *
- * Result expression tree is stored CacheMemoryContext to ensure it survives
- * as long as the relcache entry. But we should be running in a less long-lived
- * working context. To avoid leaking cache memory if this routine fails partway
- * through, we build in working memory and then copy the completed structure
- * into cache memory.
- */
-static List *
-generate_partition_qual(Relation rel)
-{
- HeapTuple tuple;
- MemoryContext oldcxt;
- Datum boundDatum;
- bool isnull;
- PartitionBoundSpec *bound;
- List *my_qual = NIL,
- *result = NIL;
- Relation parent;
- bool found_whole_row;
-
- /* Guard against stack overflow due to overly deep partition tree */
- check_stack_depth();
-
- /* Quick copy */
- if (rel->rd_partcheck != NIL)
- return copyObject(rel->rd_partcheck);
-
- /* Grab at least an AccessShareLock on the parent table */
- parent = heap_open(get_partition_parent(RelationGetRelid(rel)),
- AccessShareLock);
-
- /* Get pg_class.relpartbound */
- tuple = SearchSysCache1(RELOID, RelationGetRelid(rel));
- if (!HeapTupleIsValid(tuple))
- elog(ERROR, "cache lookup failed for relation %u",
- RelationGetRelid(rel));
-
- boundDatum = SysCacheGetAttr(RELOID, tuple,
- Anum_pg_class_relpartbound,
- &isnull);
- if (isnull) /* should not happen */
- elog(ERROR, "relation \"%s\" has relpartbound = null",
- RelationGetRelationName(rel));
- bound = castNode(PartitionBoundSpec,
- stringToNode(TextDatumGetCString(boundDatum)));
- ReleaseSysCache(tuple);
-
- my_qual = get_qual_from_partbound(rel, parent, bound);
-
- /* Add the parent's quals to the list (if any) */
- if (parent->rd_rel->relispartition)
- result = list_concat(generate_partition_qual(parent), my_qual);
- else
- result = my_qual;
-
- /*
- * Change Vars to have partition's attnos instead of the parent's. We do
- * this after we concatenate the parent's quals, because we want every Var
- * in it to bear this relation's attnos. It's safe to assume varno = 1
- * here.
- */
- result = map_partition_varattnos(result, 1, rel, parent,
- &found_whole_row);
- /* There can never be a whole-row reference here */
- if (found_whole_row)
- elog(ERROR, "unexpected whole-row reference found in partition key");
-
- /* Save a copy in the relcache */
- oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
- rel->rd_partcheck = copyObject(result);
- MemoryContextSwitchTo(oldcxt);
-
- /* Keep the parent locked until commit */
- heap_close(parent, NoLock);
-
- return result;
-}
-
-/*
- * get_partition_for_tuple
- * Finds partition of relation which accepts the partition key specified
- * in values and isnull
- *
- * Return value is index of the partition (>= 0 and < partdesc->nparts) if one
- * found or -1 if none found.
- */
-int
-get_partition_for_tuple(Relation relation, Datum *values, bool *isnull)
-{
- int bound_offset;
- int part_index = -1;
- PartitionKey key = RelationGetPartitionKey(relation);
- PartitionDesc partdesc = RelationGetPartitionDesc(relation);
-
- /* Route as appropriate based on partitioning strategy. */
- switch (key->strategy)
- {
- case PARTITION_STRATEGY_HASH:
- {
- PartitionBoundInfo boundinfo = partdesc->boundinfo;
- int greatest_modulus = get_hash_partition_greatest_modulus(boundinfo);
- uint64 rowHash = compute_hash_value(key->partnatts,
- key->partsupfunc,
- values, isnull);
-
- part_index = boundinfo->indexes[rowHash % greatest_modulus];
- }
- break;
-
- case PARTITION_STRATEGY_LIST:
- if (isnull[0])
- {
- if (partition_bound_accepts_nulls(partdesc->boundinfo))
- part_index = partdesc->boundinfo->null_index;
- }
- else
- {
- bool equal = false;
-
- bound_offset = partition_list_bsearch(key->partsupfunc,
- key->partcollation,
- partdesc->boundinfo,
- values[0], &equal);
- if (bound_offset >= 0 && equal)
- part_index = partdesc->boundinfo->indexes[bound_offset];
- }
- break;
-
- case PARTITION_STRATEGY_RANGE:
- {
- bool equal = false,
- range_partkey_has_null = false;
- int i;
-
- /*
- * No range includes NULL, so this will be accepted by the
- * default partition if there is one, and otherwise rejected.
- */
- for (i = 0; i < key->partnatts; i++)
- {
- if (isnull[i])
- {
- range_partkey_has_null = true;
- break;
- }
- }
-
- if (!range_partkey_has_null)
- {
- bound_offset = partition_range_datum_bsearch(key->partsupfunc,
- key->partcollation,
- partdesc->boundinfo,
- key->partnatts,
- values,
- &equal);
+map_partition_varattnos(List *expr, int fromrel_varno,
+ Relation to_rel, Relation from_rel,
+ bool *found_whole_row)
+{
+ bool my_found_whole_row = false;
- /*
- * The bound at bound_offset is less than or equal to the
- * tuple value, so the bound at offset+1 is the upper
- * bound of the partition we're looking for, if there
- * actually exists one.
- */
- part_index = partdesc->boundinfo->indexes[bound_offset + 1];
- }
- }
- break;
+ if (expr != NIL)
+ {
+ AttrNumber *part_attnos;
- default:
- elog(ERROR, "unexpected partition strategy: %d",
- (int) key->strategy);
+ part_attnos = convert_tuples_by_name_map(RelationGetDescr(to_rel),
+ RelationGetDescr(from_rel),
+ gettext_noop("could not convert row type"));
+ expr = (List *) map_variable_attnos((Node *) expr,
+ fromrel_varno, 0,
+ part_attnos,
+ RelationGetDescr(from_rel)->natts,
+ RelationGetForm(to_rel)->reltype,
+ &my_found_whole_row);
}
- /*
- * part_index < 0 means we failed to find a partition of this parent. Use
- * the default partition, if there is one.
- */
- if (part_index < 0)
- part_index = partdesc->boundinfo->default_index;
+ if (found_whole_row)
+ *found_whole_row = my_found_whole_row;
- return part_index;
+ return expr;
}
/*
* text.
*/
bool
-has_partition_attrs(Relation rel, Bitmapset *attnums,
- bool *used_in_expr)
+has_partition_attrs(Relation rel, Bitmapset *attnums, bool *used_in_expr)
{
- PartitionKey key;
+ PartitionKey key;
int partnatts;
List *partexprs;
ListCell *partexprs_item;
return false;
}
-/*
- * qsort_partition_hbound_cmp
- *
- * We sort hash bounds by modulus, then by remainder.
- */
-static int32
-qsort_partition_hbound_cmp(const void *a, const void *b)
-{
- PartitionHashBound *h1 = (*(PartitionHashBound *const *) a);
- PartitionHashBound *h2 = (*(PartitionHashBound *const *) b);
-
- return partition_hbound_cmp(h1->modulus, h1->remainder,
- h2->modulus, h2->remainder);
-}
-
-/*
- * partition_hbound_cmp
- *
- * Compares modulus first, then remainder if modulus are equal.
- */
-static int32
-partition_hbound_cmp(int modulus1, int remainder1, int modulus2, int remainder2)
-{
- if (modulus1 < modulus2)
- return -1;
- if (modulus1 > modulus2)
- return 1;
- if (modulus1 == modulus2 && remainder1 != remainder2)
- return (remainder1 > remainder2) ? 1 : -1;
- return 0;
-}
-
-/*
- * qsort_partition_list_value_cmp
- *
- * Compare two list partition bound datums
- */
-static int32
-qsort_partition_list_value_cmp(const void *a, const void *b, void *arg)
-{
- Datum val1 = (*(const PartitionListValue **) a)->value,
- val2 = (*(const PartitionListValue **) b)->value;
- PartitionKey key = (PartitionKey) arg;
-
- return DatumGetInt32(FunctionCall2Coll(&key->partsupfunc[0],
- key->partcollation[0],
- val1, val2));
-}
-
-/*
- * make_one_range_bound
- *
- * Return a PartitionRangeBound given a list of PartitionRangeDatum elements
- * and a flag telling whether the bound is lower or not. Made into a function
- * because there are multiple sites that want to use this facility.
- */
-static PartitionRangeBound *
-make_one_range_bound(PartitionKey key, int index, List *datums, bool lower)
-{
- PartitionRangeBound *bound;
- ListCell *lc;
- int i;
-
- Assert(datums != NIL);
-
- bound = (PartitionRangeBound *) palloc0(sizeof(PartitionRangeBound));
- bound->index = index;
- bound->datums = (Datum *) palloc0(key->partnatts * sizeof(Datum));
- bound->kind = (PartitionRangeDatumKind *) palloc0(key->partnatts *
- sizeof(PartitionRangeDatumKind));
- bound->lower = lower;
-
- i = 0;
- foreach(lc, datums)
- {
- PartitionRangeDatum *datum = castNode(PartitionRangeDatum, lfirst(lc));
-
- /* What's contained in this range datum? */
- bound->kind[i] = datum->kind;
-
- if (datum->kind == PARTITION_RANGE_DATUM_VALUE)
- {
- Const *val = castNode(Const, datum->value);
-
- if (val->constisnull)
- elog(ERROR, "invalid range bound datum");
- bound->datums[i] = val->constvalue;
- }
-
- i++;
- }
-
- return bound;
-}
-
-/* Used when sorting range bounds across all range partitions */
-static int32
-qsort_partition_rbound_cmp(const void *a, const void *b, void *arg)
-{
- PartitionRangeBound *b1 = (*(PartitionRangeBound *const *) a);
- PartitionRangeBound *b2 = (*(PartitionRangeBound *const *) b);
- PartitionKey key = (PartitionKey) arg;
-
- return partition_rbound_cmp(key->partnatts, key->partsupfunc,
- key->partcollation, b1->datums, b1->kind,
- b1->lower, b2);
-}
-
-/*
- * partition_rbound_cmp
- *
- * Return for two range bounds whether the 1st one (specified in datums1,
- * kind1, and lower1) is <, =, or > the bound specified in *b2.
- *
- * partnatts, partsupfunc and partcollation give the number of attributes in the
- * bounds to be compared, comparison function to be used and the collations of
- * attributes, respectively.
- *
- * Note that if the values of the two range bounds compare equal, then we take
- * into account whether they are upper or lower bounds, and an upper bound is
- * considered to be smaller than a lower bound. This is important to the way
- * that RelationBuildPartitionDesc() builds the PartitionBoundInfoData
- * structure, which only stores the upper bound of a common boundary between
- * two contiguous partitions.
- */
-static int32
-partition_rbound_cmp(int partnatts, FmgrInfo *partsupfunc, Oid *partcollation,
- Datum *datums1, PartitionRangeDatumKind *kind1,
- bool lower1, PartitionRangeBound *b2)
-{
- int32 cmpval = 0; /* placate compiler */
- int i;
- Datum *datums2 = b2->datums;
- PartitionRangeDatumKind *kind2 = b2->kind;
- bool lower2 = b2->lower;
-
- for (i = 0; i < partnatts; i++)
- {
- /*
- * First, handle cases where the column is unbounded, which should not
- * invoke the comparison procedure, and should not consider any later
- * columns. Note that the PartitionRangeDatumKind enum elements
- * compare the same way as the values they represent.
- */
- if (kind1[i] < kind2[i])
- return -1;
- else if (kind1[i] > kind2[i])
- return 1;
- else if (kind1[i] != PARTITION_RANGE_DATUM_VALUE)
-
- /*
- * The column bounds are both MINVALUE or both MAXVALUE. No later
- * columns should be considered, but we still need to compare
- * whether they are upper or lower bounds.
- */
- break;
-
- cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[i],
- partcollation[i],
- datums1[i],
- datums2[i]));
- if (cmpval != 0)
- break;
- }
-
- /*
- * If the comparison is anything other than equal, we're done. If they
- * compare equal though, we still have to consider whether the boundaries
- * are inclusive or exclusive. Exclusive one is considered smaller of the
- * two.
- */
- if (cmpval == 0 && lower1 != lower2)
- cmpval = lower1 ? 1 : -1;
-
- return cmpval;
-}
-
-/*
- * partition_rbound_datum_cmp
- *
- * Return whether range bound (specified in rb_datums, rb_kind, and rb_lower)
- * is <, =, or > partition key of tuple (tuple_datums)
- *
- * n_tuple_datums, partsupfunc and partcollation give number of attributes in
- * the bounds to be compared, comparison function to be used and the collations
- * of attributes resp.
- *
- */
-int32
-partition_rbound_datum_cmp(FmgrInfo *partsupfunc, Oid *partcollation,
- Datum *rb_datums, PartitionRangeDatumKind *rb_kind,
- Datum *tuple_datums, int n_tuple_datums)
-{
- int i;
- int32 cmpval = -1;
-
- for (i = 0; i < n_tuple_datums; i++)
- {
- if (rb_kind[i] == PARTITION_RANGE_DATUM_MINVALUE)
- return -1;
- else if (rb_kind[i] == PARTITION_RANGE_DATUM_MAXVALUE)
- return 1;
-
- cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[i],
- partcollation[i],
- rb_datums[i],
- tuple_datums[i]));
- if (cmpval != 0)
- break;
- }
-
- return cmpval;
-}
-
-/*
- * partition_list_bsearch
- * Returns the index of the greatest bound datum that is less than equal
- * to the given value or -1 if all of the bound datums are greater
- *
- * *is_equal is set to true if the bound datum at the returned index is equal
- * to the input value.
- */
-int
-partition_list_bsearch(FmgrInfo *partsupfunc, Oid *partcollation,
- PartitionBoundInfo boundinfo,
- Datum value, bool *is_equal)
-{
- int lo,
- hi,
- mid;
-
- lo = -1;
- hi = boundinfo->ndatums - 1;
- while (lo < hi)
- {
- int32 cmpval;
-
- mid = (lo + hi + 1) / 2;
- cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[0],
- partcollation[0],
- boundinfo->datums[mid][0],
- value));
- if (cmpval <= 0)
- {
- lo = mid;
- *is_equal = (cmpval == 0);
- if (*is_equal)
- break;
- }
- else
- hi = mid - 1;
- }
-
- return lo;
-}
-
-/*
- * partition_range_bsearch
- * Returns the index of the greatest range bound that is less than or
- * equal to the given range bound or -1 if all of the range bounds are
- * greater
- *
- * *is_equal is set to true if the range bound at the returned index is equal
- * to the input range bound
- */
-int
-partition_range_bsearch(int partnatts, FmgrInfo *partsupfunc,
- Oid *partcollation,
- PartitionBoundInfo boundinfo,
- PartitionRangeBound *probe, bool *is_equal)
-{
- int lo,
- hi,
- mid;
-
- lo = -1;
- hi = boundinfo->ndatums - 1;
- while (lo < hi)
- {
- int32 cmpval;
-
- mid = (lo + hi + 1) / 2;
- cmpval = partition_rbound_cmp(partnatts, partsupfunc, partcollation,
- boundinfo->datums[mid],
- boundinfo->kind[mid],
- (boundinfo->indexes[mid] == -1),
- probe);
- if (cmpval <= 0)
- {
- lo = mid;
- *is_equal = (cmpval == 0);
-
- if (*is_equal)
- break;
- }
- else
- hi = mid - 1;
- }
-
- return lo;
-}
-
-/*
- * partition_range_bsearch
- * Returns the index of the greatest range bound that is less than or
- * equal to the given tuple or -1 if all of the range bounds are greater
- *
- * *is_equal is set to true if the range bound at the returned index is equal
- * to the input tuple.
- */
-int
-partition_range_datum_bsearch(FmgrInfo *partsupfunc, Oid *partcollation,
- PartitionBoundInfo boundinfo,
- int nvalues, Datum *values, bool *is_equal)
-{
- int lo,
- hi,
- mid;
-
- lo = -1;
- hi = boundinfo->ndatums - 1;
- while (lo < hi)
- {
- int32 cmpval;
-
- mid = (lo + hi + 1) / 2;
- cmpval = partition_rbound_datum_cmp(partsupfunc,
- partcollation,
- boundinfo->datums[mid],
- boundinfo->kind[mid],
- values,
- nvalues);
- if (cmpval <= 0)
- {
- lo = mid;
- *is_equal = (cmpval == 0);
-
- if (*is_equal)
- break;
- }
- else
- hi = mid - 1;
- }
-
- return lo;
-}
-
-/*
- * partition_hash_bsearch
- * Returns the index of the greatest (modulus, remainder) pair that is
- * less than or equal to the given (modulus, remainder) pair or -1 if
- * all of them are greater
- */
-int
-partition_hash_bsearch(PartitionBoundInfo boundinfo,
- int modulus, int remainder)
-{
- int lo,
- hi,
- mid;
-
- lo = -1;
- hi = boundinfo->ndatums - 1;
- while (lo < hi)
- {
- int32 cmpval,
- bound_modulus,
- bound_remainder;
-
- mid = (lo + hi + 1) / 2;
- bound_modulus = DatumGetInt32(boundinfo->datums[mid][0]);
- bound_remainder = DatumGetInt32(boundinfo->datums[mid][1]);
- cmpval = partition_hbound_cmp(bound_modulus, bound_remainder,
- modulus, remainder);
- if (cmpval <= 0)
- {
- lo = mid;
-
- if (cmpval == 0)
- break;
- }
- else
- hi = mid - 1;
- }
-
- return lo;
-}
-
/*
* get_default_oid_from_partdesc
*
return make_ands_implicit(defPartConstraint);
}
-
-/*
- * get_partition_bound_num_indexes
- *
- * Returns the number of the entries in the partition bound indexes array.
- */
-static int
-get_partition_bound_num_indexes(PartitionBoundInfo bound)
-{
- int num_indexes;
-
- Assert(bound);
-
- switch (bound->strategy)
- {
- case PARTITION_STRATEGY_HASH:
-
- /*
- * The number of the entries in the indexes array is same as the
- * greatest modulus.
- */
- num_indexes = get_hash_partition_greatest_modulus(bound);
- break;
-
- case PARTITION_STRATEGY_LIST:
- num_indexes = bound->ndatums;
- break;
-
- case PARTITION_STRATEGY_RANGE:
- /* Range partitioned table has an extra index. */
- num_indexes = bound->ndatums + 1;
- break;
-
- default:
- elog(ERROR, "unexpected partition strategy: %d",
- (int) bound->strategy);
- }
-
- return num_indexes;
-}
-
-/*
- * get_hash_partition_greatest_modulus
- *
- * Returns the greatest modulus of the hash partition bound. The greatest
- * modulus will be at the end of the datums array because hash partitions are
- * arranged in the ascending order of their modulus and remainders.
- */
-int
-get_hash_partition_greatest_modulus(PartitionBoundInfo bound)
-{
- Assert(bound && bound->strategy == PARTITION_STRATEGY_HASH);
- Assert(bound->datums && bound->ndatums > 0);
- Assert(DatumGetInt32(bound->datums[bound->ndatums - 1][0]) > 0);
-
- return DatumGetInt32(bound->datums[bound->ndatums - 1][0]);
-}
-
-/*
- * compute_hash_value
- *
- * Compute the hash value for given not null partition key values.
- */
-uint64
-compute_hash_value(int partnatts, FmgrInfo *partsupfunc,
- Datum *values, bool *isnull)
-{
- int i;
- uint64 rowHash = 0;
- Datum seed = UInt64GetDatum(HASH_PARTITION_SEED);
-
- for (i = 0; i < partnatts; i++)
- {
- if (!isnull[i])
- {
- Datum hash;
-
- Assert(OidIsValid(partsupfunc[i].fn_oid));
-
- /*
- * Compute hash for each datum value by calling respective
- * datatype-specific hash functions of each partition key
- * attribute.
- */
- hash = FunctionCall2(&partsupfunc[i], values[i], seed);
-
- /* Form a single 64-bit hash value */
- rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
- }
- }
-
- return rowHash;
-}
-
-/*
- * satisfies_hash_partition
- *
- * This is an SQL-callable function for use in hash partition constraints.
- * The first three arguments are the parent table OID, modulus, and remainder.
- * The remaining arguments are the value of the partitioning columns (or
- * expressions); these are hashed and the results are combined into a single
- * hash value by calling hash_combine64.
- *
- * Returns true if remainder produced when this computed single hash value is
- * divided by the given modulus is equal to given remainder, otherwise false.
- *
- * See get_qual_for_hash() for usage.
- */
-Datum
-satisfies_hash_partition(PG_FUNCTION_ARGS)
-{
- typedef struct ColumnsHashData
- {
- Oid relid;
- int nkeys;
- Oid variadic_type;
- int16 variadic_typlen;
- bool variadic_typbyval;
- char variadic_typalign;
- FmgrInfo partsupfunc[PARTITION_MAX_KEYS];
- } ColumnsHashData;
- Oid parentId;
- int modulus;
- int remainder;
- Datum seed = UInt64GetDatum(HASH_PARTITION_SEED);
- ColumnsHashData *my_extra;
- uint64 rowHash = 0;
-
- /* Return null if the parent OID, modulus, or remainder is NULL. */
- if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(2))
- PG_RETURN_NULL();
- parentId = PG_GETARG_OID(0);
- modulus = PG_GETARG_INT32(1);
- remainder = PG_GETARG_INT32(2);
-
- /* Sanity check modulus and remainder. */
- if (modulus <= 0)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("modulus for hash partition must be a positive integer")));
- if (remainder < 0)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("remainder for hash partition must be a non-negative integer")));
- if (remainder >= modulus)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("remainder for hash partition must be less than modulus")));
-
- /*
- * Cache hash function information.
- */
- my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
- if (my_extra == NULL || my_extra->relid != parentId)
- {
- Relation parent;
- PartitionKey key;
- int j;
-
- /* Open parent relation and fetch partition keyinfo */
- parent = try_relation_open(parentId, AccessShareLock);
- if (parent == NULL)
- PG_RETURN_NULL();
- key = RelationGetPartitionKey(parent);
-
- /* Reject parent table that is not hash-partitioned. */
- if (parent->rd_rel->relkind != RELKIND_PARTITIONED_TABLE ||
- key->strategy != PARTITION_STRATEGY_HASH)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("\"%s\" is not a hash partitioned table",
- get_rel_name(parentId))));
-
- if (!get_fn_expr_variadic(fcinfo->flinfo))
- {
- int nargs = PG_NARGS() - 3;
-
- /* complain if wrong number of column values */
- if (key->partnatts != nargs)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("number of partitioning columns (%d) does not match number of partition keys provided (%d)",
- key->partnatts, nargs)));
-
- /* allocate space for our cache */
- fcinfo->flinfo->fn_extra =
- MemoryContextAllocZero(fcinfo->flinfo->fn_mcxt,
- offsetof(ColumnsHashData, partsupfunc) +
- sizeof(FmgrInfo) * nargs);
- my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
- my_extra->relid = parentId;
- my_extra->nkeys = key->partnatts;
-
- /* check argument types and save fmgr_infos */
- for (j = 0; j < key->partnatts; ++j)
- {
- Oid argtype = get_fn_expr_argtype(fcinfo->flinfo, j + 3);
-
- if (argtype != key->parttypid[j] && !IsBinaryCoercible(argtype, key->parttypid[j]))
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("column %d of the partition key has type \"%s\", but supplied value is of type \"%s\"",
- j + 1, format_type_be(key->parttypid[j]), format_type_be(argtype))));
-
- fmgr_info_copy(&my_extra->partsupfunc[j],
- &key->partsupfunc[j],
- fcinfo->flinfo->fn_mcxt);
- }
-
- }
- else
- {
- ArrayType *variadic_array = PG_GETARG_ARRAYTYPE_P(3);
-
- /* allocate space for our cache -- just one FmgrInfo in this case */
- fcinfo->flinfo->fn_extra =
- MemoryContextAllocZero(fcinfo->flinfo->fn_mcxt,
- offsetof(ColumnsHashData, partsupfunc) +
- sizeof(FmgrInfo));
- my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
- my_extra->relid = parentId;
- my_extra->nkeys = key->partnatts;
- my_extra->variadic_type = ARR_ELEMTYPE(variadic_array);
- get_typlenbyvalalign(my_extra->variadic_type,
- &my_extra->variadic_typlen,
- &my_extra->variadic_typbyval,
- &my_extra->variadic_typalign);
-
- /* check argument types */
- for (j = 0; j < key->partnatts; ++j)
- if (key->parttypid[j] != my_extra->variadic_type)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("column %d of the partition key has type \"%s\", but supplied value is of type \"%s\"",
- j + 1,
- format_type_be(key->parttypid[j]),
- format_type_be(my_extra->variadic_type))));
-
- fmgr_info_copy(&my_extra->partsupfunc[0],
- &key->partsupfunc[0],
- fcinfo->flinfo->fn_mcxt);
- }
-
- /* Hold lock until commit */
- relation_close(parent, NoLock);
- }
-
- if (!OidIsValid(my_extra->variadic_type))
- {
- int nkeys = my_extra->nkeys;
- int i;
-
- /*
- * For a non-variadic call, neither the number of arguments nor their
- * types can change across calls, so avoid the expense of rechecking
- * here.
- */
-
- for (i = 0; i < nkeys; i++)
- {
- Datum hash;
-
- /* keys start from fourth argument of function. */
- int argno = i + 3;
-
- if (PG_ARGISNULL(argno))
- continue;
-
- Assert(OidIsValid(my_extra->partsupfunc[i].fn_oid));
-
- hash = FunctionCall2(&my_extra->partsupfunc[i],
- PG_GETARG_DATUM(argno),
- seed);
-
- /* Form a single 64-bit hash value */
- rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
- }
- }
- else
- {
- ArrayType *variadic_array = PG_GETARG_ARRAYTYPE_P(3);
- int i;
- int nelems;
- Datum *datum;
- bool *isnull;
-
- deconstruct_array(variadic_array,
- my_extra->variadic_type,
- my_extra->variadic_typlen,
- my_extra->variadic_typbyval,
- my_extra->variadic_typalign,
- &datum, &isnull, &nelems);
-
- /* complain if wrong number of column values */
- if (nelems != my_extra->nkeys)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
- errmsg("number of partitioning columns (%d) does not match number of partition keys provided (%d)",
- my_extra->nkeys, nelems)));
-
- for (i = 0; i < nelems; i++)
- {
- Datum hash;
-
- if (isnull[i])
- continue;
-
- Assert(OidIsValid(my_extra->partsupfunc[0].fn_oid));
-
- hash = FunctionCall2(&my_extra->partsupfunc[0],
- datum[i],
- seed);
-
- /* Form a single 64-bit hash value */
- rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
- }
- }
-
- PG_RETURN_BOOL(rowHash % modulus == remainder);
-}
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
+#include "access/tupconvert.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
+#include "catalog/partition.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_type.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/partcache.h"
#include "utils/regproc.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "parser/parse_type.h"
#include "parser/parse_utilcmd.h"
#include "parser/parser.h"
+#include "partitioning/partbounds.h"
#include "pgstat.h"
#include "rewrite/rewriteDefine.h"
#include "rewrite/rewriteHandler.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/partcache.h"
#include "utils/relcache.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
#include "catalog/index.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
+#include "catalog/partition.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_proc.h"
#include "access/transam.h"
#include "access/xact.h"
#include "catalog/namespace.h"
-#include "catalog/partition.h"
#include "catalog/pg_publication.h"
#include "commands/matview.h"
#include "commands/trigger.h"
#include "utils/acl.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/partcache.h"
#include "utils/rls.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
*
*-------------------------------------------------------------------------
*/
-
#include "postgres.h"
+#include "catalog/partition.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_type.h"
#include "executor/execPartition.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
+#include "partitioning/partbounds.h"
+#include "partitioning/partprune.h"
#include "utils/lsyscache.h"
+#include "utils/partcache.h"
+#include "utils/rel.h"
#include "utils/rls.h"
#include "utils/ruleutils.h"
+
static PartitionDispatch *RelationGetPartitionDispatchInfo(Relation rel,
int *num_parted, List **leaf_part_oids);
static void get_partition_dispatch_recurse(Relation rel, Relation parent,
EState *estate,
Datum *values,
bool *isnull);
+static int get_partition_for_tuple(Relation relation, Datum *values,
+ bool *isnull);
static char *ExecBuildSlotPartitionKeyDescription(Relation rel,
Datum *values,
bool *isnull,
elog(ERROR, "wrong number of partition key expressions");
}
+/*
+ * get_partition_for_tuple
+ * Finds partition of relation which accepts the partition key specified
+ * in values and isnull
+ *
+ * Return value is index of the partition (>= 0 and < partdesc->nparts) if one
+ * found or -1 if none found.
+ */
+int
+get_partition_for_tuple(Relation relation, Datum *values, bool *isnull)
+{
+ int bound_offset;
+ int part_index = -1;
+ PartitionKey key = RelationGetPartitionKey(relation);
+ PartitionDesc partdesc = RelationGetPartitionDesc(relation);
+
+ /* Route as appropriate based on partitioning strategy. */
+ switch (key->strategy)
+ {
+ case PARTITION_STRATEGY_HASH:
+ {
+ PartitionBoundInfo boundinfo = partdesc->boundinfo;
+ int greatest_modulus = get_hash_partition_greatest_modulus(boundinfo);
+ uint64 rowHash = compute_hash_value(key->partnatts,
+ key->partsupfunc,
+ values, isnull);
+
+ part_index = boundinfo->indexes[rowHash % greatest_modulus];
+ }
+ break;
+
+ case PARTITION_STRATEGY_LIST:
+ if (isnull[0])
+ {
+ if (partition_bound_accepts_nulls(partdesc->boundinfo))
+ part_index = partdesc->boundinfo->null_index;
+ }
+ else
+ {
+ bool equal = false;
+
+ bound_offset = partition_list_bsearch(key->partsupfunc,
+ key->partcollation,
+ partdesc->boundinfo,
+ values[0], &equal);
+ if (bound_offset >= 0 && equal)
+ part_index = partdesc->boundinfo->indexes[bound_offset];
+ }
+ break;
+
+ case PARTITION_STRATEGY_RANGE:
+ {
+ bool equal = false,
+ range_partkey_has_null = false;
+ int i;
+
+ /*
+ * No range includes NULL, so this will be accepted by the
+ * default partition if there is one, and otherwise rejected.
+ */
+ for (i = 0; i < key->partnatts; i++)
+ {
+ if (isnull[i])
+ {
+ range_partkey_has_null = true;
+ break;
+ }
+ }
+
+ if (!range_partkey_has_null)
+ {
+ bound_offset = partition_range_datum_bsearch(key->partsupfunc,
+ key->partcollation,
+ partdesc->boundinfo,
+ key->partnatts,
+ values,
+ &equal);
+
+ /*
+ * The bound at bound_offset is less than or equal to the
+ * tuple value, so the bound at offset+1 is the upper
+ * bound of the partition we're looking for, if there
+ * actually exists one.
+ */
+ part_index = partdesc->boundinfo->indexes[bound_offset + 1];
+ }
+ }
+ break;
+
+ default:
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) key->strategy);
+ }
+
+ /*
+ * part_index < 0 means we failed to find a partition of this parent. Use
+ * the default partition, if there is one.
+ */
+ if (part_index < 0)
+ part_index = partdesc->boundinfo->default_index;
+
+ return part_index;
+}
+
/*
* ExecBuildSlotPartitionKeyDescription
*
#include "postgres.h"
#include "miscadmin.h"
-#include "catalog/partition.h"
#include "optimizer/clauses.h"
#include "optimizer/joininfo.h"
#include "optimizer/pathnode.h"
#include "optimizer/paths.h"
#include "optimizer/prep.h"
+#include "partitioning/partbounds.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "optimizer/plancat.h"
#include "optimizer/predtest.h"
#include "optimizer/prep.h"
+#include "partitioning/partbounds.h"
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "rewrite/rewriteManip.h"
#include "storage/bufmgr.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
-#include "utils/syscache.h"
+#include "utils/partcache.h"
#include "utils/rel.h"
+#include "utils/syscache.h"
#include "utils/snapmgr.h"
#include <limits.h>
#include "miscadmin.h"
-#include "catalog/partition.h"
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
#include "optimizer/tlist.h"
+#include "partitioning/partbounds.h"
#include "utils/hsearch.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
+#include "utils/partcache.h"
#include "utils/rel.h"
#include "utils/ruleutils.h"
#include "utils/syscache.h"
top_builddir = ../../..
include $(top_builddir)/src/Makefile.global
-OBJS = partprune.o
+OBJS = partprune.o partbounds.o
include $(top_srcdir)/src/backend/common.mk
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * partbounds.c
+ * Support routines for manipulating partition bounds
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ * src/backend/partitioning/partbounds.c
+ *
+ *-------------------------------------------------------------------------
+*/
+#include "postgres.h"
+
+#include "catalog/partition.h"
+#include "catalog/pg_inherits.h"
+#include "catalog/pg_type.h"
+#include "commands/tablecmds.h"
+#include "executor/executor.h"
+#include "miscadmin.h"
+#include "nodes/makefuncs.h"
+#include "nodes/nodeFuncs.h"
+#include "optimizer/clauses.h"
+#include "parser/parse_coerce.h"
+#include "partitioning/partprune.h"
+#include "partitioning/partbounds.h"
+#include "utils/builtins.h"
+#include "utils/datum.h"
+#include "utils/fmgroids.h"
+#include "utils/hashutils.h"
+#include "utils/lsyscache.h"
+#include "utils/partcache.h"
+#include "utils/rel.h"
+#include "utils/snapmgr.h"
+#include "utils/ruleutils.h"
+#include "utils/syscache.h"
+
+static int get_partition_bound_num_indexes(PartitionBoundInfo b);
+static Expr *make_partition_op_expr(PartitionKey key, int keynum,
+ uint16 strategy, Expr *arg1, Expr *arg2);
+static Oid get_partition_operator(PartitionKey key, int col,
+ StrategyNumber strategy, bool *need_relabel);
+static List *get_qual_for_hash(Relation parent, PartitionBoundSpec *spec);
+static List *get_qual_for_list(Relation parent, PartitionBoundSpec *spec);
+static List *get_qual_for_range(Relation parent, PartitionBoundSpec *spec,
+ bool for_default);
+static void get_range_key_properties(PartitionKey key, int keynum,
+ PartitionRangeDatum *ldatum,
+ PartitionRangeDatum *udatum,
+ ListCell **partexprs_item,
+ Expr **keyCol,
+ Const **lower_val, Const **upper_val);
+static List *get_range_nulltest(PartitionKey key);
+
+/*
+ * get_qual_from_partbound
+ * Given a parser node for partition bound, return the list of executable
+ * expressions as partition constraint
+ */
+List *
+get_qual_from_partbound(Relation rel, Relation parent,
+ PartitionBoundSpec *spec)
+{
+ PartitionKey key = RelationGetPartitionKey(parent);
+ List *my_qual = NIL;
+
+ Assert(key != NULL);
+
+ switch (key->strategy)
+ {
+ case PARTITION_STRATEGY_HASH:
+ Assert(spec->strategy == PARTITION_STRATEGY_HASH);
+ my_qual = get_qual_for_hash(parent, spec);
+ break;
+
+ case PARTITION_STRATEGY_LIST:
+ Assert(spec->strategy == PARTITION_STRATEGY_LIST);
+ my_qual = get_qual_for_list(parent, spec);
+ break;
+
+ case PARTITION_STRATEGY_RANGE:
+ Assert(spec->strategy == PARTITION_STRATEGY_RANGE);
+ my_qual = get_qual_for_range(parent, spec, false);
+ break;
+
+ default:
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) key->strategy);
+ }
+
+ return my_qual;
+}
+
+/*
+ * Are two partition bound collections logically equal?
+ *
+ * Used in the keep logic of relcache.c (ie, in RelationClearRelation()).
+ * This is also useful when b1 and b2 are bound collections of two separate
+ * relations, respectively, because PartitionBoundInfo is a canonical
+ * representation of partition bounds.
+ */
+bool
+partition_bounds_equal(int partnatts, int16 *parttyplen, bool *parttypbyval,
+ PartitionBoundInfo b1, PartitionBoundInfo b2)
+{
+ int i;
+
+ if (b1->strategy != b2->strategy)
+ return false;
+
+ if (b1->ndatums != b2->ndatums)
+ return false;
+
+ if (b1->null_index != b2->null_index)
+ return false;
+
+ if (b1->default_index != b2->default_index)
+ return false;
+
+ if (b1->strategy == PARTITION_STRATEGY_HASH)
+ {
+ int greatest_modulus = get_hash_partition_greatest_modulus(b1);
+
+ /*
+ * If two hash partitioned tables have different greatest moduli,
+ * their partition schemes don't match.
+ */
+ if (greatest_modulus != get_hash_partition_greatest_modulus(b2))
+ return false;
+
+ /*
+ * We arrange the partitions in the ascending order of their modulus
+ * and remainders. Also every modulus is factor of next larger
+ * modulus. Therefore we can safely store index of a given partition
+ * in indexes array at remainder of that partition. Also entries at
+ * (remainder + N * modulus) positions in indexes array are all same
+ * for (modulus, remainder) specification for any partition. Thus
+ * datums array from both the given bounds are same, if and only if
+ * their indexes array will be same. So, it suffices to compare
+ * indexes array.
+ */
+ for (i = 0; i < greatest_modulus; i++)
+ if (b1->indexes[i] != b2->indexes[i])
+ return false;
+
+#ifdef USE_ASSERT_CHECKING
+
+ /*
+ * Nonetheless make sure that the bounds are indeed same when the
+ * indexes match. Hash partition bound stores modulus and remainder
+ * at b1->datums[i][0] and b1->datums[i][1] position respectively.
+ */
+ for (i = 0; i < b1->ndatums; i++)
+ Assert((b1->datums[i][0] == b2->datums[i][0] &&
+ b1->datums[i][1] == b2->datums[i][1]));
+#endif
+ }
+ else
+ {
+ for (i = 0; i < b1->ndatums; i++)
+ {
+ int j;
+
+ for (j = 0; j < partnatts; j++)
+ {
+ /* For range partitions, the bounds might not be finite. */
+ if (b1->kind != NULL)
+ {
+ /* The different kinds of bound all differ from each other */
+ if (b1->kind[i][j] != b2->kind[i][j])
+ return false;
+
+ /*
+ * Non-finite bounds are equal without further
+ * examination.
+ */
+ if (b1->kind[i][j] != PARTITION_RANGE_DATUM_VALUE)
+ continue;
+ }
+
+ /*
+ * Compare the actual values. Note that it would be both
+ * incorrect and unsafe to invoke the comparison operator
+ * derived from the partitioning specification here. It would
+ * be incorrect because we want the relcache entry to be
+ * updated for ANY change to the partition bounds, not just
+ * those that the partitioning operator thinks are
+ * significant. It would be unsafe because we might reach
+ * this code in the context of an aborted transaction, and an
+ * arbitrary partitioning operator might not be safe in that
+ * context. datumIsEqual() should be simple enough to be
+ * safe.
+ */
+ if (!datumIsEqual(b1->datums[i][j], b2->datums[i][j],
+ parttypbyval[j], parttyplen[j]))
+ return false;
+ }
+
+ if (b1->indexes[i] != b2->indexes[i])
+ return false;
+ }
+
+ /* There are ndatums+1 indexes in case of range partitions */
+ if (b1->strategy == PARTITION_STRATEGY_RANGE &&
+ b1->indexes[i] != b2->indexes[i])
+ return false;
+ }
+ return true;
+}
+
+/*
+ * Return a copy of given PartitionBoundInfo structure. The data types of bounds
+ * are described by given partition key specification.
+ */
+PartitionBoundInfo
+partition_bounds_copy(PartitionBoundInfo src,
+ PartitionKey key)
+{
+ PartitionBoundInfo dest;
+ int i;
+ int ndatums;
+ int partnatts;
+ int num_indexes;
+
+ dest = (PartitionBoundInfo) palloc(sizeof(PartitionBoundInfoData));
+
+ dest->strategy = src->strategy;
+ ndatums = dest->ndatums = src->ndatums;
+ partnatts = key->partnatts;
+
+ num_indexes = get_partition_bound_num_indexes(src);
+
+ /* List partitioned tables have only a single partition key. */
+ Assert(key->strategy != PARTITION_STRATEGY_LIST || partnatts == 1);
+
+ dest->datums = (Datum **) palloc(sizeof(Datum *) * ndatums);
+
+ if (src->kind != NULL)
+ {
+ dest->kind = (PartitionRangeDatumKind **) palloc(ndatums *
+ sizeof(PartitionRangeDatumKind *));
+ for (i = 0; i < ndatums; i++)
+ {
+ dest->kind[i] = (PartitionRangeDatumKind *) palloc(partnatts *
+ sizeof(PartitionRangeDatumKind));
+
+ memcpy(dest->kind[i], src->kind[i],
+ sizeof(PartitionRangeDatumKind) * key->partnatts);
+ }
+ }
+ else
+ dest->kind = NULL;
+
+ for (i = 0; i < ndatums; i++)
+ {
+ int j;
+
+ /*
+ * For a corresponding to hash partition, datums array will have two
+ * elements - modulus and remainder.
+ */
+ bool hash_part = (key->strategy == PARTITION_STRATEGY_HASH);
+ int natts = hash_part ? 2 : partnatts;
+
+ dest->datums[i] = (Datum *) palloc(sizeof(Datum) * natts);
+
+ for (j = 0; j < natts; j++)
+ {
+ bool byval;
+ int typlen;
+
+ if (hash_part)
+ {
+ typlen = sizeof(int32); /* Always int4 */
+ byval = true; /* int4 is pass-by-value */
+ }
+ else
+ {
+ byval = key->parttypbyval[j];
+ typlen = key->parttyplen[j];
+ }
+
+ if (dest->kind == NULL ||
+ dest->kind[i][j] == PARTITION_RANGE_DATUM_VALUE)
+ dest->datums[i][j] = datumCopy(src->datums[i][j],
+ byval, typlen);
+ }
+ }
+
+ dest->indexes = (int *) palloc(sizeof(int) * num_indexes);
+ memcpy(dest->indexes, src->indexes, sizeof(int) * num_indexes);
+
+ dest->null_index = src->null_index;
+ dest->default_index = src->default_index;
+
+ return dest;
+}
+
+/*
+ * check_new_partition_bound
+ *
+ * Checks if the new partition's bound overlaps any of the existing partitions
+ * of parent. Also performs additional checks as necessary per strategy.
+ */
+void
+check_new_partition_bound(char *relname, Relation parent,
+ PartitionBoundSpec *spec)
+{
+ PartitionKey key = RelationGetPartitionKey(parent);
+ PartitionDesc partdesc = RelationGetPartitionDesc(parent);
+ PartitionBoundInfo boundinfo = partdesc->boundinfo;
+ ParseState *pstate = make_parsestate(NULL);
+ int with = -1;
+ bool overlap = false;
+
+ if (spec->is_default)
+ {
+ /*
+ * The default partition bound never conflicts with any other
+ * partition's; if that's what we're attaching, the only possible
+ * problem is that one already exists, so check for that and we're
+ * done.
+ */
+ if (boundinfo == NULL || !partition_bound_has_default(boundinfo))
+ return;
+
+ /* Default partition already exists, error out. */
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
+ errmsg("partition \"%s\" conflicts with existing default partition \"%s\"",
+ relname, get_rel_name(partdesc->oids[boundinfo->default_index])),
+ parser_errposition(pstate, spec->location)));
+ }
+
+ switch (key->strategy)
+ {
+ case PARTITION_STRATEGY_HASH:
+ {
+ Assert(spec->strategy == PARTITION_STRATEGY_HASH);
+ Assert(spec->remainder >= 0 && spec->remainder < spec->modulus);
+
+ if (partdesc->nparts > 0)
+ {
+ Datum **datums = boundinfo->datums;
+ int ndatums = boundinfo->ndatums;
+ int greatest_modulus;
+ int remainder;
+ int offset;
+ bool valid_modulus = true;
+ int prev_modulus, /* Previous largest modulus */
+ next_modulus; /* Next largest modulus */
+
+ /*
+ * Check rule that every modulus must be a factor of the
+ * next larger modulus. For example, if you have a bunch
+ * of partitions that all have modulus 5, you can add a
+ * new partition with modulus 10 or a new partition with
+ * modulus 15, but you cannot add both a partition with
+ * modulus 10 and a partition with modulus 15, because 10
+ * is not a factor of 15.
+ *
+ * Get the greatest (modulus, remainder) pair contained in
+ * boundinfo->datums that is less than or equal to the
+ * (spec->modulus, spec->remainder) pair.
+ */
+ offset = partition_hash_bsearch(boundinfo,
+ spec->modulus,
+ spec->remainder);
+ if (offset < 0)
+ {
+ next_modulus = DatumGetInt32(datums[0][0]);
+ valid_modulus = (next_modulus % spec->modulus) == 0;
+ }
+ else
+ {
+ prev_modulus = DatumGetInt32(datums[offset][0]);
+ valid_modulus = (spec->modulus % prev_modulus) == 0;
+
+ if (valid_modulus && (offset + 1) < ndatums)
+ {
+ next_modulus = DatumGetInt32(datums[offset + 1][0]);
+ valid_modulus = (next_modulus % spec->modulus) == 0;
+ }
+ }
+
+ if (!valid_modulus)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
+ errmsg("every hash partition modulus must be a factor of the next larger modulus")));
+
+ greatest_modulus = get_hash_partition_greatest_modulus(boundinfo);
+ remainder = spec->remainder;
+
+ /*
+ * Normally, the lowest remainder that could conflict with
+ * the new partition is equal to the remainder specified
+ * for the new partition, but when the new partition has a
+ * modulus higher than any used so far, we need to adjust.
+ */
+ if (remainder >= greatest_modulus)
+ remainder = remainder % greatest_modulus;
+
+ /* Check every potentially-conflicting remainder. */
+ do
+ {
+ if (boundinfo->indexes[remainder] != -1)
+ {
+ overlap = true;
+ with = boundinfo->indexes[remainder];
+ break;
+ }
+ remainder += spec->modulus;
+ } while (remainder < greatest_modulus);
+ }
+
+ break;
+ }
+
+ case PARTITION_STRATEGY_LIST:
+ {
+ Assert(spec->strategy == PARTITION_STRATEGY_LIST);
+
+ if (partdesc->nparts > 0)
+ {
+ ListCell *cell;
+
+ Assert(boundinfo &&
+ boundinfo->strategy == PARTITION_STRATEGY_LIST &&
+ (boundinfo->ndatums > 0 ||
+ partition_bound_accepts_nulls(boundinfo) ||
+ partition_bound_has_default(boundinfo)));
+
+ foreach(cell, spec->listdatums)
+ {
+ Const *val = castNode(Const, lfirst(cell));
+
+ if (!val->constisnull)
+ {
+ int offset;
+ bool equal;
+
+ offset = partition_list_bsearch(&key->partsupfunc[0],
+ key->partcollation,
+ boundinfo,
+ val->constvalue,
+ &equal);
+ if (offset >= 0 && equal)
+ {
+ overlap = true;
+ with = boundinfo->indexes[offset];
+ break;
+ }
+ }
+ else if (partition_bound_accepts_nulls(boundinfo))
+ {
+ overlap = true;
+ with = boundinfo->null_index;
+ break;
+ }
+ }
+ }
+
+ break;
+ }
+
+ case PARTITION_STRATEGY_RANGE:
+ {
+ PartitionRangeBound *lower,
+ *upper;
+
+ Assert(spec->strategy == PARTITION_STRATEGY_RANGE);
+ lower = make_one_range_bound(key, -1, spec->lowerdatums, true);
+ upper = make_one_range_bound(key, -1, spec->upperdatums, false);
+
+ /*
+ * First check if the resulting range would be empty with
+ * specified lower and upper bounds
+ */
+ if (partition_rbound_cmp(key->partnatts, key->partsupfunc,
+ key->partcollation, lower->datums,
+ lower->kind, true, upper) >= 0)
+ {
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
+ errmsg("empty range bound specified for partition \"%s\"",
+ relname),
+ errdetail("Specified lower bound %s is greater than or equal to upper bound %s.",
+ get_range_partbound_string(spec->lowerdatums),
+ get_range_partbound_string(spec->upperdatums)),
+ parser_errposition(pstate, spec->location)));
+ }
+
+ if (partdesc->nparts > 0)
+ {
+ int offset;
+ bool equal;
+
+ Assert(boundinfo &&
+ boundinfo->strategy == PARTITION_STRATEGY_RANGE &&
+ (boundinfo->ndatums > 0 ||
+ partition_bound_has_default(boundinfo)));
+
+ /*
+ * Test whether the new lower bound (which is treated
+ * inclusively as part of the new partition) lies inside
+ * an existing partition, or in a gap.
+ *
+ * If it's inside an existing partition, the bound at
+ * offset + 1 will be the upper bound of that partition,
+ * and its index will be >= 0.
+ *
+ * If it's in a gap, the bound at offset + 1 will be the
+ * lower bound of the next partition, and its index will
+ * be -1. This is also true if there is no next partition,
+ * since the index array is initialised with an extra -1
+ * at the end.
+ */
+ offset = partition_range_bsearch(key->partnatts,
+ key->partsupfunc,
+ key->partcollation,
+ boundinfo, lower,
+ &equal);
+
+ if (boundinfo->indexes[offset + 1] < 0)
+ {
+ /*
+ * Check that the new partition will fit in the gap.
+ * For it to fit, the new upper bound must be less
+ * than or equal to the lower bound of the next
+ * partition, if there is one.
+ */
+ if (offset + 1 < boundinfo->ndatums)
+ {
+ int32 cmpval;
+ Datum *datums;
+ PartitionRangeDatumKind *kind;
+ bool is_lower;
+
+ datums = boundinfo->datums[offset + 1];
+ kind = boundinfo->kind[offset + 1];
+ is_lower = (boundinfo->indexes[offset + 1] == -1);
+
+ cmpval = partition_rbound_cmp(key->partnatts,
+ key->partsupfunc,
+ key->partcollation,
+ datums, kind,
+ is_lower, upper);
+ if (cmpval < 0)
+ {
+ /*
+ * The new partition overlaps with the
+ * existing partition between offset + 1 and
+ * offset + 2.
+ */
+ overlap = true;
+ with = boundinfo->indexes[offset + 2];
+ }
+ }
+ }
+ else
+ {
+ /*
+ * The new partition overlaps with the existing
+ * partition between offset and offset + 1.
+ */
+ overlap = true;
+ with = boundinfo->indexes[offset + 1];
+ }
+ }
+
+ break;
+ }
+
+ default:
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) key->strategy);
+ }
+
+ if (overlap)
+ {
+ Assert(with >= 0);
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
+ errmsg("partition \"%s\" would overlap partition \"%s\"",
+ relname, get_rel_name(partdesc->oids[with])),
+ parser_errposition(pstate, spec->location)));
+ }
+}
+
+/*
+ * check_default_allows_bound
+ *
+ * This function checks if there exists a row in the default partition that
+ * would properly belong to the new partition being added. If it finds one,
+ * it throws an error.
+ */
+void
+check_default_allows_bound(Relation parent, Relation default_rel,
+ PartitionBoundSpec *new_spec)
+{
+ List *new_part_constraints;
+ List *def_part_constraints;
+ List *all_parts;
+ ListCell *lc;
+
+ new_part_constraints = (new_spec->strategy == PARTITION_STRATEGY_LIST)
+ ? get_qual_for_list(parent, new_spec)
+ : get_qual_for_range(parent, new_spec, false);
+ def_part_constraints =
+ get_proposed_default_constraint(new_part_constraints);
+
+ /*
+ * If the existing constraints on the default partition imply that it will
+ * not contain any row that would belong to the new partition, we can
+ * avoid scanning the default partition.
+ */
+ if (PartConstraintImpliedByRelConstraint(default_rel, def_part_constraints))
+ {
+ ereport(INFO,
+ (errmsg("updated partition constraint for default partition \"%s\" is implied by existing constraints",
+ RelationGetRelationName(default_rel))));
+ return;
+ }
+
+ /*
+ * Scan the default partition and its subpartitions, and check for rows
+ * that do not satisfy the revised partition constraints.
+ */
+ if (default_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
+ all_parts = find_all_inheritors(RelationGetRelid(default_rel),
+ AccessExclusiveLock, NULL);
+ else
+ all_parts = list_make1_oid(RelationGetRelid(default_rel));
+
+ foreach(lc, all_parts)
+ {
+ Oid part_relid = lfirst_oid(lc);
+ Relation part_rel;
+ Expr *constr;
+ Expr *partition_constraint;
+ EState *estate;
+ HeapTuple tuple;
+ ExprState *partqualstate = NULL;
+ Snapshot snapshot;
+ TupleDesc tupdesc;
+ ExprContext *econtext;
+ HeapScanDesc scan;
+ MemoryContext oldCxt;
+ TupleTableSlot *tupslot;
+
+ /* Lock already taken above. */
+ if (part_relid != RelationGetRelid(default_rel))
+ {
+ part_rel = heap_open(part_relid, NoLock);
+
+ /*
+ * If the partition constraints on default partition child imply
+ * that it will not contain any row that would belong to the new
+ * partition, we can avoid scanning the child table.
+ */
+ if (PartConstraintImpliedByRelConstraint(part_rel,
+ def_part_constraints))
+ {
+ ereport(INFO,
+ (errmsg("updated partition constraint for default partition \"%s\" is implied by existing constraints",
+ RelationGetRelationName(part_rel))));
+
+ heap_close(part_rel, NoLock);
+ continue;
+ }
+ }
+ else
+ part_rel = default_rel;
+
+ /*
+ * Only RELKIND_RELATION relations (i.e. leaf partitions) need to be
+ * scanned.
+ */
+ if (part_rel->rd_rel->relkind != RELKIND_RELATION)
+ {
+ if (part_rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
+ ereport(WARNING,
+ (errcode(ERRCODE_CHECK_VIOLATION),
+ errmsg("skipped scanning foreign table \"%s\" which is a partition of default partition \"%s\"",
+ RelationGetRelationName(part_rel),
+ RelationGetRelationName(default_rel))));
+
+ if (RelationGetRelid(default_rel) != RelationGetRelid(part_rel))
+ heap_close(part_rel, NoLock);
+
+ continue;
+ }
+
+ tupdesc = CreateTupleDescCopy(RelationGetDescr(part_rel));
+ constr = linitial(def_part_constraints);
+ partition_constraint = (Expr *)
+ map_partition_varattnos((List *) constr,
+ 1, part_rel, parent, NULL);
+ estate = CreateExecutorState();
+
+ /* Build expression execution states for partition check quals */
+ partqualstate = ExecPrepareExpr(partition_constraint, estate);
+
+ econtext = GetPerTupleExprContext(estate);
+ snapshot = RegisterSnapshot(GetLatestSnapshot());
+ scan = heap_beginscan(part_rel, snapshot, 0, NULL);
+ tupslot = MakeSingleTupleTableSlot(tupdesc);
+
+ /*
+ * Switch to per-tuple memory context and reset it for each tuple
+ * produced, so we don't leak memory.
+ */
+ oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
+
+ while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
+ {
+ ExecStoreTuple(tuple, tupslot, InvalidBuffer, false);
+ econtext->ecxt_scantuple = tupslot;
+
+ if (!ExecCheck(partqualstate, econtext))
+ ereport(ERROR,
+ (errcode(ERRCODE_CHECK_VIOLATION),
+ errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
+ RelationGetRelationName(default_rel))));
+
+ ResetExprContext(econtext);
+ CHECK_FOR_INTERRUPTS();
+ }
+
+ MemoryContextSwitchTo(oldCxt);
+ heap_endscan(scan);
+ UnregisterSnapshot(snapshot);
+ ExecDropSingleTupleTableSlot(tupslot);
+ FreeExecutorState(estate);
+
+ if (RelationGetRelid(default_rel) != RelationGetRelid(part_rel))
+ heap_close(part_rel, NoLock); /* keep the lock until commit */
+ }
+}
+
+/*
+ * get_hash_partition_greatest_modulus
+ *
+ * Returns the greatest modulus of the hash partition bound. The greatest
+ * modulus will be at the end of the datums array because hash partitions are
+ * arranged in the ascending order of their modulus and remainders.
+ */
+int
+get_hash_partition_greatest_modulus(PartitionBoundInfo bound)
+{
+ Assert(bound && bound->strategy == PARTITION_STRATEGY_HASH);
+ Assert(bound->datums && bound->ndatums > 0);
+ Assert(DatumGetInt32(bound->datums[bound->ndatums - 1][0]) > 0);
+
+ return DatumGetInt32(bound->datums[bound->ndatums - 1][0]);
+}
+
+/*
+ * make_one_range_bound
+ *
+ * Return a PartitionRangeBound given a list of PartitionRangeDatum elements
+ * and a flag telling whether the bound is lower or not. Made into a function
+ * because there are multiple sites that want to use this facility.
+ */
+PartitionRangeBound *
+make_one_range_bound(PartitionKey key, int index, List *datums, bool lower)
+{
+ PartitionRangeBound *bound;
+ ListCell *lc;
+ int i;
+
+ Assert(datums != NIL);
+
+ bound = (PartitionRangeBound *) palloc0(sizeof(PartitionRangeBound));
+ bound->index = index;
+ bound->datums = (Datum *) palloc0(key->partnatts * sizeof(Datum));
+ bound->kind = (PartitionRangeDatumKind *) palloc0(key->partnatts *
+ sizeof(PartitionRangeDatumKind));
+ bound->lower = lower;
+
+ i = 0;
+ foreach(lc, datums)
+ {
+ PartitionRangeDatum *datum = castNode(PartitionRangeDatum, lfirst(lc));
+
+ /* What's contained in this range datum? */
+ bound->kind[i] = datum->kind;
+
+ if (datum->kind == PARTITION_RANGE_DATUM_VALUE)
+ {
+ Const *val = castNode(Const, datum->value);
+
+ if (val->constisnull)
+ elog(ERROR, "invalid range bound datum");
+ bound->datums[i] = val->constvalue;
+ }
+
+ i++;
+ }
+
+ return bound;
+}
+
+/*
+ * partition_rbound_cmp
+ *
+ * Return for two range bounds whether the 1st one (specified in datums1,
+ * kind1, and lower1) is <, =, or > the bound specified in *b2.
+ *
+ * partnatts, partsupfunc and partcollation give the number of attributes in the
+ * bounds to be compared, comparison function to be used and the collations of
+ * attributes, respectively.
+ *
+ * Note that if the values of the two range bounds compare equal, then we take
+ * into account whether they are upper or lower bounds, and an upper bound is
+ * considered to be smaller than a lower bound. This is important to the way
+ * that RelationBuildPartitionDesc() builds the PartitionBoundInfoData
+ * structure, which only stores the upper bound of a common boundary between
+ * two contiguous partitions.
+ */
+int32
+partition_rbound_cmp(int partnatts, FmgrInfo *partsupfunc,
+ Oid *partcollation,
+ Datum *datums1, PartitionRangeDatumKind *kind1,
+ bool lower1, PartitionRangeBound *b2)
+{
+ int32 cmpval = 0; /* placate compiler */
+ int i;
+ Datum *datums2 = b2->datums;
+ PartitionRangeDatumKind *kind2 = b2->kind;
+ bool lower2 = b2->lower;
+
+ for (i = 0; i < partnatts; i++)
+ {
+ /*
+ * First, handle cases where the column is unbounded, which should not
+ * invoke the comparison procedure, and should not consider any later
+ * columns. Note that the PartitionRangeDatumKind enum elements
+ * compare the same way as the values they represent.
+ */
+ if (kind1[i] < kind2[i])
+ return -1;
+ else if (kind1[i] > kind2[i])
+ return 1;
+ else if (kind1[i] != PARTITION_RANGE_DATUM_VALUE)
+
+ /*
+ * The column bounds are both MINVALUE or both MAXVALUE. No later
+ * columns should be considered, but we still need to compare
+ * whether they are upper or lower bounds.
+ */
+ break;
+
+ cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[i],
+ partcollation[i],
+ datums1[i],
+ datums2[i]));
+ if (cmpval != 0)
+ break;
+ }
+
+ /*
+ * If the comparison is anything other than equal, we're done. If they
+ * compare equal though, we still have to consider whether the boundaries
+ * are inclusive or exclusive. Exclusive one is considered smaller of the
+ * two.
+ */
+ if (cmpval == 0 && lower1 != lower2)
+ cmpval = lower1 ? 1 : -1;
+
+ return cmpval;
+}
+
+/*
+ * partition_rbound_datum_cmp
+ *
+ * Return whether range bound (specified in rb_datums, rb_kind, and rb_lower)
+ * is <, =, or > partition key of tuple (tuple_datums)
+ *
+ * n_tuple_datums, partsupfunc and partcollation give number of attributes in
+ * the bounds to be compared, comparison function to be used and the collations
+ * of attributes resp.
+ *
+ */
+int32
+partition_rbound_datum_cmp(FmgrInfo *partsupfunc, Oid *partcollation,
+ Datum *rb_datums, PartitionRangeDatumKind *rb_kind,
+ Datum *tuple_datums, int n_tuple_datums)
+{
+ int i;
+ int32 cmpval = -1;
+
+ for (i = 0; i < n_tuple_datums; i++)
+ {
+ if (rb_kind[i] == PARTITION_RANGE_DATUM_MINVALUE)
+ return -1;
+ else if (rb_kind[i] == PARTITION_RANGE_DATUM_MAXVALUE)
+ return 1;
+
+ cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[i],
+ partcollation[i],
+ rb_datums[i],
+ tuple_datums[i]));
+ if (cmpval != 0)
+ break;
+ }
+
+ return cmpval;
+}
+
+/*
+ * partition_hbound_cmp
+ *
+ * Compares modulus first, then remainder if modulus are equal.
+ */
+int32
+partition_hbound_cmp(int modulus1, int remainder1, int modulus2, int remainder2)
+{
+ if (modulus1 < modulus2)
+ return -1;
+ if (modulus1 > modulus2)
+ return 1;
+ if (modulus1 == modulus2 && remainder1 != remainder2)
+ return (remainder1 > remainder2) ? 1 : -1;
+ return 0;
+}
+
+/*
+ * partition_list_bsearch
+ * Returns the index of the greatest bound datum that is less than equal
+ * to the given value or -1 if all of the bound datums are greater
+ *
+ * *is_equal is set to true if the bound datum at the returned index is equal
+ * to the input value.
+ */
+int
+partition_list_bsearch(FmgrInfo *partsupfunc, Oid *partcollation,
+ PartitionBoundInfo boundinfo,
+ Datum value, bool *is_equal)
+{
+ int lo,
+ hi,
+ mid;
+
+ lo = -1;
+ hi = boundinfo->ndatums - 1;
+ while (lo < hi)
+ {
+ int32 cmpval;
+
+ mid = (lo + hi + 1) / 2;
+ cmpval = DatumGetInt32(FunctionCall2Coll(&partsupfunc[0],
+ partcollation[0],
+ boundinfo->datums[mid][0],
+ value));
+ if (cmpval <= 0)
+ {
+ lo = mid;
+ *is_equal = (cmpval == 0);
+ if (*is_equal)
+ break;
+ }
+ else
+ hi = mid - 1;
+ }
+
+ return lo;
+}
+
+/*
+ * partition_range_bsearch
+ * Returns the index of the greatest range bound that is less than or
+ * equal to the given range bound or -1 if all of the range bounds are
+ * greater
+ *
+ * *is_equal is set to true if the range bound at the returned index is equal
+ * to the input range bound
+ */
+int
+partition_range_bsearch(int partnatts, FmgrInfo *partsupfunc,
+ Oid *partcollation,
+ PartitionBoundInfo boundinfo,
+ PartitionRangeBound *probe, bool *is_equal)
+{
+ int lo,
+ hi,
+ mid;
+
+ lo = -1;
+ hi = boundinfo->ndatums - 1;
+ while (lo < hi)
+ {
+ int32 cmpval;
+
+ mid = (lo + hi + 1) / 2;
+ cmpval = partition_rbound_cmp(partnatts, partsupfunc,
+ partcollation,
+ boundinfo->datums[mid],
+ boundinfo->kind[mid],
+ (boundinfo->indexes[mid] == -1),
+ probe);
+ if (cmpval <= 0)
+ {
+ lo = mid;
+ *is_equal = (cmpval == 0);
+
+ if (*is_equal)
+ break;
+ }
+ else
+ hi = mid - 1;
+ }
+
+ return lo;
+}
+
+/*
+ * partition_range_bsearch
+ * Returns the index of the greatest range bound that is less than or
+ * equal to the given tuple or -1 if all of the range bounds are greater
+ *
+ * *is_equal is set to true if the range bound at the returned index is equal
+ * to the input tuple.
+ */
+int
+partition_range_datum_bsearch(FmgrInfo *partsupfunc, Oid *partcollation,
+ PartitionBoundInfo boundinfo,
+ int nvalues, Datum *values, bool *is_equal)
+{
+ int lo,
+ hi,
+ mid;
+
+ lo = -1;
+ hi = boundinfo->ndatums - 1;
+ while (lo < hi)
+ {
+ int32 cmpval;
+
+ mid = (lo + hi + 1) / 2;
+ cmpval = partition_rbound_datum_cmp(partsupfunc,
+ partcollation,
+ boundinfo->datums[mid],
+ boundinfo->kind[mid],
+ values,
+ nvalues);
+ if (cmpval <= 0)
+ {
+ lo = mid;
+ *is_equal = (cmpval == 0);
+
+ if (*is_equal)
+ break;
+ }
+ else
+ hi = mid - 1;
+ }
+
+ return lo;
+}
+
+/*
+ * partition_hash_bsearch
+ * Returns the index of the greatest (modulus, remainder) pair that is
+ * less than or equal to the given (modulus, remainder) pair or -1 if
+ * all of them are greater
+ */
+int
+partition_hash_bsearch(PartitionBoundInfo boundinfo,
+ int modulus, int remainder)
+{
+ int lo,
+ hi,
+ mid;
+
+ lo = -1;
+ hi = boundinfo->ndatums - 1;
+ while (lo < hi)
+ {
+ int32 cmpval,
+ bound_modulus,
+ bound_remainder;
+
+ mid = (lo + hi + 1) / 2;
+ bound_modulus = DatumGetInt32(boundinfo->datums[mid][0]);
+ bound_remainder = DatumGetInt32(boundinfo->datums[mid][1]);
+ cmpval = partition_hbound_cmp(bound_modulus, bound_remainder,
+ modulus, remainder);
+ if (cmpval <= 0)
+ {
+ lo = mid;
+
+ if (cmpval == 0)
+ break;
+ }
+ else
+ hi = mid - 1;
+ }
+
+ return lo;
+}
+
+/*
+ * get_partition_bound_num_indexes
+ *
+ * Returns the number of the entries in the partition bound indexes array.
+ */
+static int
+get_partition_bound_num_indexes(PartitionBoundInfo bound)
+{
+ int num_indexes;
+
+ Assert(bound);
+
+ switch (bound->strategy)
+ {
+ case PARTITION_STRATEGY_HASH:
+
+ /*
+ * The number of the entries in the indexes array is same as the
+ * greatest modulus.
+ */
+ num_indexes = get_hash_partition_greatest_modulus(bound);
+ break;
+
+ case PARTITION_STRATEGY_LIST:
+ num_indexes = bound->ndatums;
+ break;
+
+ case PARTITION_STRATEGY_RANGE:
+ /* Range partitioned table has an extra index. */
+ num_indexes = bound->ndatums + 1;
+ break;
+
+ default:
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) bound->strategy);
+ }
+
+ return num_indexes;
+}
+
+/*
+ * get_partition_operator
+ *
+ * Return oid of the operator of given strategy for a given partition key
+ * column.
+ */
+static Oid
+get_partition_operator(PartitionKey key, int col, StrategyNumber strategy,
+ bool *need_relabel)
+{
+ Oid operoid;
+
+ /*
+ * First check if there exists an operator of the given strategy, with
+ * this column's type as both its lefttype and righttype, in the
+ * partitioning operator family specified for the column.
+ */
+ operoid = get_opfamily_member(key->partopfamily[col],
+ key->parttypid[col],
+ key->parttypid[col],
+ strategy);
+
+ /*
+ * If one doesn't exist, we must resort to using an operator in the same
+ * operator family but with the operator class declared input type. It is
+ * OK to do so, because the column's type is known to be binary-coercible
+ * with the operator class input type (otherwise, the operator class in
+ * question would not have been accepted as the partitioning operator
+ * class). We must however inform the caller to wrap the non-Const
+ * expression with a RelabelType node to denote the implicit coercion. It
+ * ensures that the resulting expression structurally matches similarly
+ * processed expressions within the optimizer.
+ */
+ if (!OidIsValid(operoid))
+ {
+ operoid = get_opfamily_member(key->partopfamily[col],
+ key->partopcintype[col],
+ key->partopcintype[col],
+ strategy);
+ if (!OidIsValid(operoid))
+ elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
+ strategy, key->partopcintype[col], key->partopcintype[col],
+ key->partopfamily[col]);
+ *need_relabel = true;
+ }
+ else
+ *need_relabel = false;
+
+ return operoid;
+}
+
+/*
+ * make_partition_op_expr
+ * Returns an Expr for the given partition key column with arg1 and
+ * arg2 as its leftop and rightop, respectively
+ */
+static Expr *
+make_partition_op_expr(PartitionKey key, int keynum,
+ uint16 strategy, Expr *arg1, Expr *arg2)
+{
+ Oid operoid;
+ bool need_relabel = false;
+ Expr *result = NULL;
+
+ /* Get the correct btree operator for this partitioning column */
+ operoid = get_partition_operator(key, keynum, strategy, &need_relabel);
+
+ /*
+ * Chosen operator may be such that the non-Const operand needs to be
+ * coerced, so apply the same; see the comment in
+ * get_partition_operator().
+ */
+ if (!IsA(arg1, Const) &&
+ (need_relabel ||
+ key->partcollation[keynum] != key->parttypcoll[keynum]))
+ arg1 = (Expr *) makeRelabelType(arg1,
+ key->partopcintype[keynum],
+ -1,
+ key->partcollation[keynum],
+ COERCE_EXPLICIT_CAST);
+
+ /* Generate the actual expression */
+ switch (key->strategy)
+ {
+ case PARTITION_STRATEGY_LIST:
+ {
+ List *elems = (List *) arg2;
+ int nelems = list_length(elems);
+
+ Assert(nelems >= 1);
+ Assert(keynum == 0);
+
+ if (nelems > 1 &&
+ !type_is_array(key->parttypid[keynum]))
+ {
+ ArrayExpr *arrexpr;
+ ScalarArrayOpExpr *saopexpr;
+
+ /* Construct an ArrayExpr for the right-hand inputs */
+ arrexpr = makeNode(ArrayExpr);
+ arrexpr->array_typeid =
+ get_array_type(key->parttypid[keynum]);
+ arrexpr->array_collid = key->parttypcoll[keynum];
+ arrexpr->element_typeid = key->parttypid[keynum];
+ arrexpr->elements = elems;
+ arrexpr->multidims = false;
+ arrexpr->location = -1;
+
+ /* Build leftop = ANY (rightop) */
+ saopexpr = makeNode(ScalarArrayOpExpr);
+ saopexpr->opno = operoid;
+ saopexpr->opfuncid = get_opcode(operoid);
+ saopexpr->useOr = true;
+ saopexpr->inputcollid = key->partcollation[keynum];
+ saopexpr->args = list_make2(arg1, arrexpr);
+ saopexpr->location = -1;
+
+ result = (Expr *) saopexpr;
+ }
+ else
+ {
+ List *elemops = NIL;
+ ListCell *lc;
+
+ foreach(lc, elems)
+ {
+ Expr *elem = lfirst(lc),
+ *elemop;
+
+ elemop = make_opclause(operoid,
+ BOOLOID,
+ false,
+ arg1, elem,
+ InvalidOid,
+ key->partcollation[keynum]);
+ elemops = lappend(elemops, elemop);
+ }
+
+ result = nelems > 1 ? makeBoolExpr(OR_EXPR, elemops, -1) : linitial(elemops);
+ }
+ break;
+ }
+
+ case PARTITION_STRATEGY_RANGE:
+ result = make_opclause(operoid,
+ BOOLOID,
+ false,
+ arg1, arg2,
+ InvalidOid,
+ key->partcollation[keynum]);
+ break;
+
+ default:
+ elog(ERROR, "invalid partitioning strategy");
+ break;
+ }
+
+ return result;
+}
+
+/*
+ * get_qual_for_hash
+ *
+ * Returns a CHECK constraint expression to use as a hash partition's
+ * constraint, given the parent relation and partition bound structure.
+ *
+ * The partition constraint for a hash partition is always a call to the
+ * built-in function satisfies_hash_partition().
+ */
+static List *
+get_qual_for_hash(Relation parent, PartitionBoundSpec *spec)
+{
+ PartitionKey key = RelationGetPartitionKey(parent);
+ FuncExpr *fexpr;
+ Node *relidConst;
+ Node *modulusConst;
+ Node *remainderConst;
+ List *args;
+ ListCell *partexprs_item;
+ int i;
+
+ /* Fixed arguments. */
+ relidConst = (Node *) makeConst(OIDOID,
+ -1,
+ InvalidOid,
+ sizeof(Oid),
+ ObjectIdGetDatum(RelationGetRelid(parent)),
+ false,
+ true);
+
+ modulusConst = (Node *) makeConst(INT4OID,
+ -1,
+ InvalidOid,
+ sizeof(int32),
+ Int32GetDatum(spec->modulus),
+ false,
+ true);
+
+ remainderConst = (Node *) makeConst(INT4OID,
+ -1,
+ InvalidOid,
+ sizeof(int32),
+ Int32GetDatum(spec->remainder),
+ false,
+ true);
+
+ args = list_make3(relidConst, modulusConst, remainderConst);
+ partexprs_item = list_head(key->partexprs);
+
+ /* Add an argument for each key column. */
+ for (i = 0; i < key->partnatts; i++)
+ {
+ Node *keyCol;
+
+ /* Left operand */
+ if (key->partattrs[i] != 0)
+ {
+ keyCol = (Node *) makeVar(1,
+ key->partattrs[i],
+ key->parttypid[i],
+ key->parttypmod[i],
+ key->parttypcoll[i],
+ 0);
+ }
+ else
+ {
+ keyCol = (Node *) copyObject(lfirst(partexprs_item));
+ partexprs_item = lnext(partexprs_item);
+ }
+
+ args = lappend(args, keyCol);
+ }
+
+ fexpr = makeFuncExpr(F_SATISFIES_HASH_PARTITION,
+ BOOLOID,
+ args,
+ InvalidOid,
+ InvalidOid,
+ COERCE_EXPLICIT_CALL);
+
+ return list_make1(fexpr);
+}
+
+/*
+ * get_qual_for_list
+ *
+ * Returns an implicit-AND list of expressions to use as a list partition's
+ * constraint, given the parent relation and partition bound structure.
+ *
+ * The function returns NIL for a default partition when it's the only
+ * partition since in that case there is no constraint.
+ */
+static List *
+get_qual_for_list(Relation parent, PartitionBoundSpec *spec)
+{
+ PartitionKey key = RelationGetPartitionKey(parent);
+ List *result;
+ Expr *keyCol;
+ Expr *opexpr;
+ NullTest *nulltest;
+ ListCell *cell;
+ List *elems = NIL;
+ bool list_has_null = false;
+
+ /*
+ * Only single-column list partitioning is supported, so we are worried
+ * only about the partition key with index 0.
+ */
+ Assert(key->partnatts == 1);
+
+ /* Construct Var or expression representing the partition column */
+ if (key->partattrs[0] != 0)
+ keyCol = (Expr *) makeVar(1,
+ key->partattrs[0],
+ key->parttypid[0],
+ key->parttypmod[0],
+ key->parttypcoll[0],
+ 0);
+ else
+ keyCol = (Expr *) copyObject(linitial(key->partexprs));
+
+ /*
+ * For default list partition, collect datums for all the partitions. The
+ * default partition constraint should check that the partition key is
+ * equal to none of those.
+ */
+ if (spec->is_default)
+ {
+ int i;
+ int ndatums = 0;
+ PartitionDesc pdesc = RelationGetPartitionDesc(parent);
+ PartitionBoundInfo boundinfo = pdesc->boundinfo;
+
+ if (boundinfo)
+ {
+ ndatums = boundinfo->ndatums;
+
+ if (partition_bound_accepts_nulls(boundinfo))
+ list_has_null = true;
+ }
+
+ /*
+ * If default is the only partition, there need not be any partition
+ * constraint on it.
+ */
+ if (ndatums == 0 && !list_has_null)
+ return NIL;
+
+ for (i = 0; i < ndatums; i++)
+ {
+ Const *val;
+
+ /*
+ * Construct Const from known-not-null datum. We must be careful
+ * to copy the value, because our result has to be able to outlive
+ * the relcache entry we're copying from.
+ */
+ val = makeConst(key->parttypid[0],
+ key->parttypmod[0],
+ key->parttypcoll[0],
+ key->parttyplen[0],
+ datumCopy(*boundinfo->datums[i],
+ key->parttypbyval[0],
+ key->parttyplen[0]),
+ false, /* isnull */
+ key->parttypbyval[0]);
+
+ elems = lappend(elems, val);
+ }
+ }
+ else
+ {
+ /*
+ * Create list of Consts for the allowed values, excluding any nulls.
+ */
+ foreach(cell, spec->listdatums)
+ {
+ Const *val = castNode(Const, lfirst(cell));
+
+ if (val->constisnull)
+ list_has_null = true;
+ else
+ elems = lappend(elems, copyObject(val));
+ }
+ }
+
+ if (elems)
+ {
+ /*
+ * Generate the operator expression from the non-null partition
+ * values.
+ */
+ opexpr = make_partition_op_expr(key, 0, BTEqualStrategyNumber,
+ keyCol, (Expr *) elems);
+ }
+ else
+ {
+ /*
+ * If there are no partition values, we don't need an operator
+ * expression.
+ */
+ opexpr = NULL;
+ }
+
+ if (!list_has_null)
+ {
+ /*
+ * Gin up a "col IS NOT NULL" test that will be AND'd with the main
+ * expression. This might seem redundant, but the partition routing
+ * machinery needs it.
+ */
+ nulltest = makeNode(NullTest);
+ nulltest->arg = keyCol;
+ nulltest->nulltesttype = IS_NOT_NULL;
+ nulltest->argisrow = false;
+ nulltest->location = -1;
+
+ result = opexpr ? list_make2(nulltest, opexpr) : list_make1(nulltest);
+ }
+ else
+ {
+ /*
+ * Gin up a "col IS NULL" test that will be OR'd with the main
+ * expression.
+ */
+ nulltest = makeNode(NullTest);
+ nulltest->arg = keyCol;
+ nulltest->nulltesttype = IS_NULL;
+ nulltest->argisrow = false;
+ nulltest->location = -1;
+
+ if (opexpr)
+ {
+ Expr *or;
+
+ or = makeBoolExpr(OR_EXPR, list_make2(nulltest, opexpr), -1);
+ result = list_make1(or);
+ }
+ else
+ result = list_make1(nulltest);
+ }
+
+ /*
+ * Note that, in general, applying NOT to a constraint expression doesn't
+ * necessarily invert the set of rows it accepts, because NOT (NULL) is
+ * NULL. However, the partition constraints we construct here never
+ * evaluate to NULL, so applying NOT works as intended.
+ */
+ if (spec->is_default)
+ {
+ result = list_make1(make_ands_explicit(result));
+ result = list_make1(makeBoolExpr(NOT_EXPR, result, -1));
+ }
+
+ return result;
+}
+
+/*
+ * get_qual_for_range
+ *
+ * Returns an implicit-AND list of expressions to use as a range partition's
+ * constraint, given the parent relation and partition bound structure.
+ *
+ * For a multi-column range partition key, say (a, b, c), with (al, bl, cl)
+ * as the lower bound tuple and (au, bu, cu) as the upper bound tuple, we
+ * generate an expression tree of the following form:
+ *
+ * (a IS NOT NULL) and (b IS NOT NULL) and (c IS NOT NULL)
+ * AND
+ * (a > al OR (a = al AND b > bl) OR (a = al AND b = bl AND c >= cl))
+ * AND
+ * (a < au OR (a = au AND b < bu) OR (a = au AND b = bu AND c < cu))
+ *
+ * It is often the case that a prefix of lower and upper bound tuples contains
+ * the same values, for example, (al = au), in which case, we will emit an
+ * expression tree of the following form:
+ *
+ * (a IS NOT NULL) and (b IS NOT NULL) and (c IS NOT NULL)
+ * AND
+ * (a = al)
+ * AND
+ * (b > bl OR (b = bl AND c >= cl))
+ * AND
+ * (b < bu) OR (b = bu AND c < cu))
+ *
+ * If a bound datum is either MINVALUE or MAXVALUE, these expressions are
+ * simplified using the fact that any value is greater than MINVALUE and less
+ * than MAXVALUE. So, for example, if cu = MAXVALUE, c < cu is automatically
+ * true, and we need not emit any expression for it, and the last line becomes
+ *
+ * (b < bu) OR (b = bu), which is simplified to (b <= bu)
+ *
+ * In most common cases with only one partition column, say a, the following
+ * expression tree will be generated: a IS NOT NULL AND a >= al AND a < au
+ *
+ * For default partition, it returns the negation of the constraints of all
+ * the other partitions.
+ *
+ * External callers should pass for_default as false; we set it to true only
+ * when recursing.
+ */
+static List *
+get_qual_for_range(Relation parent, PartitionBoundSpec *spec,
+ bool for_default)
+{
+ List *result = NIL;
+ ListCell *cell1,
+ *cell2,
+ *partexprs_item,
+ *partexprs_item_saved;
+ int i,
+ j;
+ PartitionRangeDatum *ldatum,
+ *udatum;
+ PartitionKey key = RelationGetPartitionKey(parent);
+ Expr *keyCol;
+ Const *lower_val,
+ *upper_val;
+ List *lower_or_arms,
+ *upper_or_arms;
+ int num_or_arms,
+ current_or_arm;
+ ListCell *lower_or_start_datum,
+ *upper_or_start_datum;
+ bool need_next_lower_arm,
+ need_next_upper_arm;
+
+ if (spec->is_default)
+ {
+ List *or_expr_args = NIL;
+ PartitionDesc pdesc = RelationGetPartitionDesc(parent);
+ Oid *inhoids = pdesc->oids;
+ int nparts = pdesc->nparts,
+ i;
+
+ for (i = 0; i < nparts; i++)
+ {
+ Oid inhrelid = inhoids[i];
+ HeapTuple tuple;
+ Datum datum;
+ bool isnull;
+ PartitionBoundSpec *bspec;
+
+ tuple = SearchSysCache1(RELOID, inhrelid);
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "cache lookup failed for relation %u", inhrelid);
+
+ datum = SysCacheGetAttr(RELOID, tuple,
+ Anum_pg_class_relpartbound,
+ &isnull);
+
+ Assert(!isnull);
+ bspec = (PartitionBoundSpec *)
+ stringToNode(TextDatumGetCString(datum));
+ if (!IsA(bspec, PartitionBoundSpec))
+ elog(ERROR, "expected PartitionBoundSpec");
+
+ if (!bspec->is_default)
+ {
+ List *part_qual;
+
+ part_qual = get_qual_for_range(parent, bspec, true);
+
+ /*
+ * AND the constraints of the partition and add to
+ * or_expr_args
+ */
+ or_expr_args = lappend(or_expr_args, list_length(part_qual) > 1
+ ? makeBoolExpr(AND_EXPR, part_qual, -1)
+ : linitial(part_qual));
+ }
+ ReleaseSysCache(tuple);
+ }
+
+ if (or_expr_args != NIL)
+ {
+ Expr *other_parts_constr;
+
+ /*
+ * Combine the constraints obtained for non-default partitions
+ * using OR. As requested, each of the OR's args doesn't include
+ * the NOT NULL test for partition keys (which is to avoid its
+ * useless repetition). Add the same now.
+ */
+ other_parts_constr =
+ makeBoolExpr(AND_EXPR,
+ lappend(get_range_nulltest(key),
+ list_length(or_expr_args) > 1
+ ? makeBoolExpr(OR_EXPR, or_expr_args,
+ -1)
+ : linitial(or_expr_args)),
+ -1);
+
+ /*
+ * Finally, the default partition contains everything *NOT*
+ * contained in the non-default partitions.
+ */
+ result = list_make1(makeBoolExpr(NOT_EXPR,
+ list_make1(other_parts_constr), -1));
+ }
+
+ return result;
+ }
+
+ lower_or_start_datum = list_head(spec->lowerdatums);
+ upper_or_start_datum = list_head(spec->upperdatums);
+ num_or_arms = key->partnatts;
+
+ /*
+ * If it is the recursive call for default, we skip the get_range_nulltest
+ * to avoid accumulating the NullTest on the same keys for each partition.
+ */
+ if (!for_default)
+ result = get_range_nulltest(key);
+
+ /*
+ * Iterate over the key columns and check if the corresponding lower and
+ * upper datums are equal using the btree equality operator for the
+ * column's type. If equal, we emit single keyCol = common_value
+ * expression. Starting from the first column for which the corresponding
+ * lower and upper bound datums are not equal, we generate OR expressions
+ * as shown in the function's header comment.
+ */
+ i = 0;
+ partexprs_item = list_head(key->partexprs);
+ partexprs_item_saved = partexprs_item; /* placate compiler */
+ forboth(cell1, spec->lowerdatums, cell2, spec->upperdatums)
+ {
+ EState *estate;
+ MemoryContext oldcxt;
+ Expr *test_expr;
+ ExprState *test_exprstate;
+ Datum test_result;
+ bool isNull;
+
+ ldatum = castNode(PartitionRangeDatum, lfirst(cell1));
+ udatum = castNode(PartitionRangeDatum, lfirst(cell2));
+
+ /*
+ * Since get_range_key_properties() modifies partexprs_item, and we
+ * might need to start over from the previous expression in the later
+ * part of this function, save away the current value.
+ */
+ partexprs_item_saved = partexprs_item;
+
+ get_range_key_properties(key, i, ldatum, udatum,
+ &partexprs_item,
+ &keyCol,
+ &lower_val, &upper_val);
+
+ /*
+ * If either value is NULL, the corresponding partition bound is
+ * either MINVALUE or MAXVALUE, and we treat them as unequal, because
+ * even if they're the same, there is no common value to equate the
+ * key column with.
+ */
+ if (!lower_val || !upper_val)
+ break;
+
+ /* Create the test expression */
+ estate = CreateExecutorState();
+ oldcxt = MemoryContextSwitchTo(estate->es_query_cxt);
+ test_expr = make_partition_op_expr(key, i, BTEqualStrategyNumber,
+ (Expr *) lower_val,
+ (Expr *) upper_val);
+ fix_opfuncids((Node *) test_expr);
+ test_exprstate = ExecInitExpr(test_expr, NULL);
+ test_result = ExecEvalExprSwitchContext(test_exprstate,
+ GetPerTupleExprContext(estate),
+ &isNull);
+ MemoryContextSwitchTo(oldcxt);
+ FreeExecutorState(estate);
+
+ /* If not equal, go generate the OR expressions */
+ if (!DatumGetBool(test_result))
+ break;
+
+ /*
+ * The bounds for the last key column can't be equal, because such a
+ * range partition would never be allowed to be defined (it would have
+ * an empty range otherwise).
+ */
+ if (i == key->partnatts - 1)
+ elog(ERROR, "invalid range bound specification");
+
+ /* Equal, so generate keyCol = lower_val expression */
+ result = lappend(result,
+ make_partition_op_expr(key, i, BTEqualStrategyNumber,
+ keyCol, (Expr *) lower_val));
+
+ i++;
+ }
+
+ /* First pair of lower_val and upper_val that are not equal. */
+ lower_or_start_datum = cell1;
+ upper_or_start_datum = cell2;
+
+ /* OR will have as many arms as there are key columns left. */
+ num_or_arms = key->partnatts - i;
+ current_or_arm = 0;
+ lower_or_arms = upper_or_arms = NIL;
+ need_next_lower_arm = need_next_upper_arm = true;
+ while (current_or_arm < num_or_arms)
+ {
+ List *lower_or_arm_args = NIL,
+ *upper_or_arm_args = NIL;
+
+ /* Restart scan of columns from the i'th one */
+ j = i;
+ partexprs_item = partexprs_item_saved;
+
+ for_both_cell(cell1, lower_or_start_datum, cell2, upper_or_start_datum)
+ {
+ PartitionRangeDatum *ldatum_next = NULL,
+ *udatum_next = NULL;
+
+ ldatum = castNode(PartitionRangeDatum, lfirst(cell1));
+ if (lnext(cell1))
+ ldatum_next = castNode(PartitionRangeDatum,
+ lfirst(lnext(cell1)));
+ udatum = castNode(PartitionRangeDatum, lfirst(cell2));
+ if (lnext(cell2))
+ udatum_next = castNode(PartitionRangeDatum,
+ lfirst(lnext(cell2)));
+ get_range_key_properties(key, j, ldatum, udatum,
+ &partexprs_item,
+ &keyCol,
+ &lower_val, &upper_val);
+
+ if (need_next_lower_arm && lower_val)
+ {
+ uint16 strategy;
+
+ /*
+ * For the non-last columns of this arm, use the EQ operator.
+ * For the last column of this arm, use GT, unless this is the
+ * last column of the whole bound check, or the next bound
+ * datum is MINVALUE, in which case use GE.
+ */
+ if (j - i < current_or_arm)
+ strategy = BTEqualStrategyNumber;
+ else if (j == key->partnatts - 1 ||
+ (ldatum_next &&
+ ldatum_next->kind == PARTITION_RANGE_DATUM_MINVALUE))
+ strategy = BTGreaterEqualStrategyNumber;
+ else
+ strategy = BTGreaterStrategyNumber;
+
+ lower_or_arm_args = lappend(lower_or_arm_args,
+ make_partition_op_expr(key, j,
+ strategy,
+ keyCol,
+ (Expr *) lower_val));
+ }
+
+ if (need_next_upper_arm && upper_val)
+ {
+ uint16 strategy;
+
+ /*
+ * For the non-last columns of this arm, use the EQ operator.
+ * For the last column of this arm, use LT, unless the next
+ * bound datum is MAXVALUE, in which case use LE.
+ */
+ if (j - i < current_or_arm)
+ strategy = BTEqualStrategyNumber;
+ else if (udatum_next &&
+ udatum_next->kind == PARTITION_RANGE_DATUM_MAXVALUE)
+ strategy = BTLessEqualStrategyNumber;
+ else
+ strategy = BTLessStrategyNumber;
+
+ upper_or_arm_args = lappend(upper_or_arm_args,
+ make_partition_op_expr(key, j,
+ strategy,
+ keyCol,
+ (Expr *) upper_val));
+ }
+
+ /*
+ * Did we generate enough of OR's arguments? First arm considers
+ * the first of the remaining columns, second arm considers first
+ * two of the remaining columns, and so on.
+ */
+ ++j;
+ if (j - i > current_or_arm)
+ {
+ /*
+ * We must not emit any more arms if the new column that will
+ * be considered is unbounded, or this one was.
+ */
+ if (!lower_val || !ldatum_next ||
+ ldatum_next->kind != PARTITION_RANGE_DATUM_VALUE)
+ need_next_lower_arm = false;
+ if (!upper_val || !udatum_next ||
+ udatum_next->kind != PARTITION_RANGE_DATUM_VALUE)
+ need_next_upper_arm = false;
+ break;
+ }
+ }
+
+ if (lower_or_arm_args != NIL)
+ lower_or_arms = lappend(lower_or_arms,
+ list_length(lower_or_arm_args) > 1
+ ? makeBoolExpr(AND_EXPR, lower_or_arm_args, -1)
+ : linitial(lower_or_arm_args));
+
+ if (upper_or_arm_args != NIL)
+ upper_or_arms = lappend(upper_or_arms,
+ list_length(upper_or_arm_args) > 1
+ ? makeBoolExpr(AND_EXPR, upper_or_arm_args, -1)
+ : linitial(upper_or_arm_args));
+
+ /* If no work to do in the next iteration, break away. */
+ if (!need_next_lower_arm && !need_next_upper_arm)
+ break;
+
+ ++current_or_arm;
+ }
+
+ /*
+ * Generate the OR expressions for each of lower and upper bounds (if
+ * required), and append to the list of implicitly ANDed list of
+ * expressions.
+ */
+ if (lower_or_arms != NIL)
+ result = lappend(result,
+ list_length(lower_or_arms) > 1
+ ? makeBoolExpr(OR_EXPR, lower_or_arms, -1)
+ : linitial(lower_or_arms));
+ if (upper_or_arms != NIL)
+ result = lappend(result,
+ list_length(upper_or_arms) > 1
+ ? makeBoolExpr(OR_EXPR, upper_or_arms, -1)
+ : linitial(upper_or_arms));
+
+ /*
+ * As noted above, for non-default, we return list with constant TRUE. If
+ * the result is NIL during the recursive call for default, it implies
+ * this is the only other partition which can hold every value of the key
+ * except NULL. Hence we return the NullTest result skipped earlier.
+ */
+ if (result == NIL)
+ result = for_default
+ ? get_range_nulltest(key)
+ : list_make1(makeBoolConst(true, false));
+
+ return result;
+}
+
+/*
+ * get_range_key_properties
+ * Returns range partition key information for a given column
+ *
+ * This is a subroutine for get_qual_for_range, and its API is pretty
+ * specialized to that caller.
+ *
+ * Constructs an Expr for the key column (returned in *keyCol) and Consts
+ * for the lower and upper range limits (returned in *lower_val and
+ * *upper_val). For MINVALUE/MAXVALUE limits, NULL is returned instead of
+ * a Const. All of these structures are freshly palloc'd.
+ *
+ * *partexprs_item points to the cell containing the next expression in
+ * the key->partexprs list, or NULL. It may be advanced upon return.
+ */
+static void
+get_range_key_properties(PartitionKey key, int keynum,
+ PartitionRangeDatum *ldatum,
+ PartitionRangeDatum *udatum,
+ ListCell **partexprs_item,
+ Expr **keyCol,
+ Const **lower_val, Const **upper_val)
+{
+ /* Get partition key expression for this column */
+ if (key->partattrs[keynum] != 0)
+ {
+ *keyCol = (Expr *) makeVar(1,
+ key->partattrs[keynum],
+ key->parttypid[keynum],
+ key->parttypmod[keynum],
+ key->parttypcoll[keynum],
+ 0);
+ }
+ else
+ {
+ if (*partexprs_item == NULL)
+ elog(ERROR, "wrong number of partition key expressions");
+ *keyCol = copyObject(lfirst(*partexprs_item));
+ *partexprs_item = lnext(*partexprs_item);
+ }
+
+ /* Get appropriate Const nodes for the bounds */
+ if (ldatum->kind == PARTITION_RANGE_DATUM_VALUE)
+ *lower_val = castNode(Const, copyObject(ldatum->value));
+ else
+ *lower_val = NULL;
+
+ if (udatum->kind == PARTITION_RANGE_DATUM_VALUE)
+ *upper_val = castNode(Const, copyObject(udatum->value));
+ else
+ *upper_val = NULL;
+}
+
+/*
+ * get_range_nulltest
+ *
+ * A non-default range partition table does not currently allow partition
+ * keys to be null, so emit an IS NOT NULL expression for each key column.
+ */
+static List *
+get_range_nulltest(PartitionKey key)
+{
+ List *result = NIL;
+ NullTest *nulltest;
+ ListCell *partexprs_item;
+ int i;
+
+ partexprs_item = list_head(key->partexprs);
+ for (i = 0; i < key->partnatts; i++)
+ {
+ Expr *keyCol;
+
+ if (key->partattrs[i] != 0)
+ {
+ keyCol = (Expr *) makeVar(1,
+ key->partattrs[i],
+ key->parttypid[i],
+ key->parttypmod[i],
+ key->parttypcoll[i],
+ 0);
+ }
+ else
+ {
+ if (partexprs_item == NULL)
+ elog(ERROR, "wrong number of partition key expressions");
+ keyCol = copyObject(lfirst(partexprs_item));
+ partexprs_item = lnext(partexprs_item);
+ }
+
+ nulltest = makeNode(NullTest);
+ nulltest->arg = keyCol;
+ nulltest->nulltesttype = IS_NOT_NULL;
+ nulltest->argisrow = false;
+ nulltest->location = -1;
+ result = lappend(result, nulltest);
+ }
+
+ return result;
+}
+
+/*
+ * compute_hash_value
+ *
+ * Compute the hash value for given not null partition key values.
+ */
+uint64
+compute_hash_value(int partnatts, FmgrInfo *partsupfunc,
+ Datum *values, bool *isnull)
+{
+ int i;
+ uint64 rowHash = 0;
+ Datum seed = UInt64GetDatum(HASH_PARTITION_SEED);
+
+ for (i = 0; i < partnatts; i++)
+ {
+ if (!isnull[i])
+ {
+ Datum hash;
+
+ Assert(OidIsValid(partsupfunc[i].fn_oid));
+
+ /*
+ * Compute hash for each datum value by calling respective
+ * datatype-specific hash functions of each partition key
+ * attribute.
+ */
+ hash = FunctionCall2(&partsupfunc[i], values[i], seed);
+
+ /* Form a single 64-bit hash value */
+ rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
+ }
+ }
+
+ return rowHash;
+}
+
+/*
+ * satisfies_hash_partition
+ *
+ * This is an SQL-callable function for use in hash partition constraints.
+ * The first three arguments are the parent table OID, modulus, and remainder.
+ * The remaining arguments are the value of the partitioning columns (or
+ * expressions); these are hashed and the results are combined into a single
+ * hash value by calling hash_combine64.
+ *
+ * Returns true if remainder produced when this computed single hash value is
+ * divided by the given modulus is equal to given remainder, otherwise false.
+ *
+ * See get_qual_for_hash() for usage.
+ */
+Datum
+satisfies_hash_partition(PG_FUNCTION_ARGS)
+{
+ typedef struct ColumnsHashData
+ {
+ Oid relid;
+ int nkeys;
+ Oid variadic_type;
+ int16 variadic_typlen;
+ bool variadic_typbyval;
+ char variadic_typalign;
+ FmgrInfo partsupfunc[PARTITION_MAX_KEYS];
+ } ColumnsHashData;
+ Oid parentId;
+ int modulus;
+ int remainder;
+ Datum seed = UInt64GetDatum(HASH_PARTITION_SEED);
+ ColumnsHashData *my_extra;
+ uint64 rowHash = 0;
+
+ /* Return null if the parent OID, modulus, or remainder is NULL. */
+ if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(2))
+ PG_RETURN_NULL();
+ parentId = PG_GETARG_OID(0);
+ modulus = PG_GETARG_INT32(1);
+ remainder = PG_GETARG_INT32(2);
+
+ /* Sanity check modulus and remainder. */
+ if (modulus <= 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("modulus for hash partition must be a positive integer")));
+ if (remainder < 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("remainder for hash partition must be a non-negative integer")));
+ if (remainder >= modulus)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("remainder for hash partition must be less than modulus")));
+
+ /*
+ * Cache hash function information.
+ */
+ my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
+ if (my_extra == NULL || my_extra->relid != parentId)
+ {
+ Relation parent;
+ PartitionKey key;
+ int j;
+
+ /* Open parent relation and fetch partition keyinfo */
+ parent = try_relation_open(parentId, AccessShareLock);
+ if (parent == NULL)
+ PG_RETURN_NULL();
+ key = RelationGetPartitionKey(parent);
+
+ /* Reject parent table that is not hash-partitioned. */
+ if (parent->rd_rel->relkind != RELKIND_PARTITIONED_TABLE ||
+ key->strategy != PARTITION_STRATEGY_HASH)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("\"%s\" is not a hash partitioned table",
+ get_rel_name(parentId))));
+
+ if (!get_fn_expr_variadic(fcinfo->flinfo))
+ {
+ int nargs = PG_NARGS() - 3;
+
+ /* complain if wrong number of column values */
+ if (key->partnatts != nargs)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("number of partitioning columns (%d) does not match number of partition keys provided (%d)",
+ key->partnatts, nargs)));
+
+ /* allocate space for our cache */
+ fcinfo->flinfo->fn_extra =
+ MemoryContextAllocZero(fcinfo->flinfo->fn_mcxt,
+ offsetof(ColumnsHashData, partsupfunc) +
+ sizeof(FmgrInfo) * nargs);
+ my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
+ my_extra->relid = parentId;
+ my_extra->nkeys = key->partnatts;
+
+ /* check argument types and save fmgr_infos */
+ for (j = 0; j < key->partnatts; ++j)
+ {
+ Oid argtype = get_fn_expr_argtype(fcinfo->flinfo, j + 3);
+
+ if (argtype != key->parttypid[j] && !IsBinaryCoercible(argtype, key->parttypid[j]))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("column %d of the partition key has type \"%s\", but supplied value is of type \"%s\"",
+ j + 1, format_type_be(key->parttypid[j]), format_type_be(argtype))));
+
+ fmgr_info_copy(&my_extra->partsupfunc[j],
+ &key->partsupfunc[j],
+ fcinfo->flinfo->fn_mcxt);
+ }
+
+ }
+ else
+ {
+ ArrayType *variadic_array = PG_GETARG_ARRAYTYPE_P(3);
+
+ /* allocate space for our cache -- just one FmgrInfo in this case */
+ fcinfo->flinfo->fn_extra =
+ MemoryContextAllocZero(fcinfo->flinfo->fn_mcxt,
+ offsetof(ColumnsHashData, partsupfunc) +
+ sizeof(FmgrInfo));
+ my_extra = (ColumnsHashData *) fcinfo->flinfo->fn_extra;
+ my_extra->relid = parentId;
+ my_extra->nkeys = key->partnatts;
+ my_extra->variadic_type = ARR_ELEMTYPE(variadic_array);
+ get_typlenbyvalalign(my_extra->variadic_type,
+ &my_extra->variadic_typlen,
+ &my_extra->variadic_typbyval,
+ &my_extra->variadic_typalign);
+
+ /* check argument types */
+ for (j = 0; j < key->partnatts; ++j)
+ if (key->parttypid[j] != my_extra->variadic_type)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("column %d of the partition key has type \"%s\", but supplied value is of type \"%s\"",
+ j + 1,
+ format_type_be(key->parttypid[j]),
+ format_type_be(my_extra->variadic_type))));
+
+ fmgr_info_copy(&my_extra->partsupfunc[0],
+ &key->partsupfunc[0],
+ fcinfo->flinfo->fn_mcxt);
+ }
+
+ /* Hold lock until commit */
+ relation_close(parent, NoLock);
+ }
+
+ if (!OidIsValid(my_extra->variadic_type))
+ {
+ int nkeys = my_extra->nkeys;
+ int i;
+
+ /*
+ * For a non-variadic call, neither the number of arguments nor their
+ * types can change across calls, so avoid the expense of rechecking
+ * here.
+ */
+
+ for (i = 0; i < nkeys; i++)
+ {
+ Datum hash;
+
+ /* keys start from fourth argument of function. */
+ int argno = i + 3;
+
+ if (PG_ARGISNULL(argno))
+ continue;
+
+ Assert(OidIsValid(my_extra->partsupfunc[i].fn_oid));
+
+ hash = FunctionCall2(&my_extra->partsupfunc[i],
+ PG_GETARG_DATUM(argno),
+ seed);
+
+ /* Form a single 64-bit hash value */
+ rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
+ }
+ }
+ else
+ {
+ ArrayType *variadic_array = PG_GETARG_ARRAYTYPE_P(3);
+ int i;
+ int nelems;
+ Datum *datum;
+ bool *isnull;
+
+ deconstruct_array(variadic_array,
+ my_extra->variadic_type,
+ my_extra->variadic_typlen,
+ my_extra->variadic_typbyval,
+ my_extra->variadic_typalign,
+ &datum, &isnull, &nelems);
+
+ /* complain if wrong number of column values */
+ if (nelems != my_extra->nkeys)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("number of partitioning columns (%d) does not match number of partition keys provided (%d)",
+ my_extra->nkeys, nelems)));
+
+ for (i = 0; i < nelems; i++)
+ {
+ Datum hash;
+
+ if (isnull[i])
+ continue;
+
+ Assert(OidIsValid(my_extra->partsupfunc[0].fn_oid));
+
+ hash = FunctionCall2(&my_extra->partsupfunc[0],
+ datum[i],
+ seed);
+
+ /* Form a single 64-bit hash value */
+ rowHash = hash_combine64(rowHash, DatumGetUInt64(hash));
+ }
+ }
+
+ PG_RETURN_BOOL(rowHash % modulus == remainder);
+}
#include "utils/acl.h"
#include "utils/guc.h"
#include "utils/syscache.h"
+#include "utils/rel.h"
/* Hook for plugins to get control in ProcessUtility() */
#include "access/sysattr.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
-#include "catalog/partition.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_am.h"
#include "catalog/pg_authid.h"
#include "utils/guc.h"
#include "utils/hsearch.h"
#include "utils/lsyscache.h"
+#include "utils/partcache.h"
#include "utils/rel.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
top_builddir = ../../../..
include $(top_builddir)/src/Makefile.global
-OBJS = attoptcache.o catcache.o evtcache.o inval.o plancache.o relcache.o \
- relmapper.o relfilenodemap.o spccache.o syscache.o lsyscache.o \
- typcache.o ts_cache.o
+OBJS = attoptcache.o catcache.o evtcache.o inval.o lsyscache.o \
+ partcache.o plancache.o relcache.o relmapper.o relfilenodemap.o \
+ spccache.o syscache.o ts_cache.o typcache.o
include $(top_srcdir)/src/backend/common.mk
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * partcache.c
+ * Support routines for manipulating partition information cached in
+ * relcache
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ * src/backend/utils/cache/partcache.c
+ *
+ *-------------------------------------------------------------------------
+*/
+#include "postgres.h"
+
+#include "access/hash.h"
+#include "access/heapam.h"
+#include "access/htup_details.h"
+#include "access/nbtree.h"
+#include "catalog/partition.h"
+#include "catalog/pg_inherits.h"
+#include "catalog/pg_opclass.h"
+#include "catalog/pg_partitioned_table.h"
+#include "miscadmin.h"
+#include "nodes/makefuncs.h"
+#include "nodes/nodeFuncs.h"
+#include "optimizer/clauses.h"
+#include "optimizer/planner.h"
+#include "partitioning/partbounds.h"
+#include "utils/builtins.h"
+#include "utils/datum.h"
+#include "utils/lsyscache.h"
+#include "utils/memutils.h"
+#include "utils/partcache.h"
+#include "utils/rel.h"
+#include "utils/syscache.h"
+
+
+static List *generate_partition_qual(Relation rel);
+static int32 qsort_partition_hbound_cmp(const void *a, const void *b);
+static int32 qsort_partition_list_value_cmp(const void *a, const void *b,
+ void *arg);
+static int32 qsort_partition_rbound_cmp(const void *a, const void *b,
+ void *arg);
+
+
+/*
+ * RelationBuildPartitionKey
+ * Build and attach to relcache partition key data of relation
+ *
+ * Partitioning key data is a complex structure; to avoid complicated logic to
+ * free individual elements whenever the relcache entry is flushed, we give it
+ * its own memory context, child of CacheMemoryContext, which can easily be
+ * deleted on its own. To avoid leaking memory in that context in case of an
+ * error partway through this function, the context is initially created as a
+ * child of CurTransactionContext and only re-parented to CacheMemoryContext
+ * at the end, when no further errors are possible. Also, we don't make this
+ * context the current context except in very brief code sections, out of fear
+ * that some of our callees allocate memory on their own which would be leaked
+ * permanently.
+ */
+void
+RelationBuildPartitionKey(Relation relation)
+{
+ Form_pg_partitioned_table form;
+ HeapTuple tuple;
+ bool isnull;
+ int i;
+ PartitionKey key;
+ AttrNumber *attrs;
+ oidvector *opclass;
+ oidvector *collation;
+ ListCell *partexprs_item;
+ Datum datum;
+ MemoryContext partkeycxt,
+ oldcxt;
+ int16 procnum;
+
+ tuple = SearchSysCache1(PARTRELID,
+ ObjectIdGetDatum(RelationGetRelid(relation)));
+
+ /*
+ * The following happens when we have created our pg_class entry but not
+ * the pg_partitioned_table entry yet.
+ */
+ if (!HeapTupleIsValid(tuple))
+ return;
+
+ partkeycxt = AllocSetContextCreate(CurTransactionContext,
+ "partition key",
+ ALLOCSET_SMALL_SIZES);
+ MemoryContextCopyAndSetIdentifier(partkeycxt,
+ RelationGetRelationName(relation));
+
+ key = (PartitionKey) MemoryContextAllocZero(partkeycxt,
+ sizeof(PartitionKeyData));
+
+ /* Fixed-length attributes */
+ form = (Form_pg_partitioned_table) GETSTRUCT(tuple);
+ key->strategy = form->partstrat;
+ key->partnatts = form->partnatts;
+
+ /*
+ * We can rely on the first variable-length attribute being mapped to the
+ * relevant field of the catalog's C struct, because all previous
+ * attributes are non-nullable and fixed-length.
+ */
+ attrs = form->partattrs.values;
+
+ /* But use the hard way to retrieve further variable-length attributes */
+ /* Operator class */
+ datum = SysCacheGetAttr(PARTRELID, tuple,
+ Anum_pg_partitioned_table_partclass, &isnull);
+ Assert(!isnull);
+ opclass = (oidvector *) DatumGetPointer(datum);
+
+ /* Collation */
+ datum = SysCacheGetAttr(PARTRELID, tuple,
+ Anum_pg_partitioned_table_partcollation, &isnull);
+ Assert(!isnull);
+ collation = (oidvector *) DatumGetPointer(datum);
+
+ /* Expressions */
+ datum = SysCacheGetAttr(PARTRELID, tuple,
+ Anum_pg_partitioned_table_partexprs, &isnull);
+ if (!isnull)
+ {
+ char *exprString;
+ Node *expr;
+
+ exprString = TextDatumGetCString(datum);
+ expr = stringToNode(exprString);
+ pfree(exprString);
+
+ /*
+ * Run the expressions through const-simplification since the planner
+ * will be comparing them to similarly-processed qual clause operands,
+ * and may fail to detect valid matches without this step; fix
+ * opfuncids while at it. We don't need to bother with
+ * canonicalize_qual() though, because partition expressions should be
+ * in canonical form already (ie, no need for OR-merging or constant
+ * elimination).
+ */
+ expr = eval_const_expressions(NULL, expr);
+ fix_opfuncids(expr);
+
+ oldcxt = MemoryContextSwitchTo(partkeycxt);
+ key->partexprs = (List *) copyObject(expr);
+ MemoryContextSwitchTo(oldcxt);
+ }
+
+ oldcxt = MemoryContextSwitchTo(partkeycxt);
+ key->partattrs = (AttrNumber *) palloc0(key->partnatts * sizeof(AttrNumber));
+ key->partopfamily = (Oid *) palloc0(key->partnatts * sizeof(Oid));
+ key->partopcintype = (Oid *) palloc0(key->partnatts * sizeof(Oid));
+ key->partsupfunc = (FmgrInfo *) palloc0(key->partnatts * sizeof(FmgrInfo));
+
+ key->partcollation = (Oid *) palloc0(key->partnatts * sizeof(Oid));
+
+ /* Gather type and collation info as well */
+ key->parttypid = (Oid *) palloc0(key->partnatts * sizeof(Oid));
+ key->parttypmod = (int32 *) palloc0(key->partnatts * sizeof(int32));
+ key->parttyplen = (int16 *) palloc0(key->partnatts * sizeof(int16));
+ key->parttypbyval = (bool *) palloc0(key->partnatts * sizeof(bool));
+ key->parttypalign = (char *) palloc0(key->partnatts * sizeof(char));
+ key->parttypcoll = (Oid *) palloc0(key->partnatts * sizeof(Oid));
+ MemoryContextSwitchTo(oldcxt);
+
+ /* determine support function number to search for */
+ procnum = (key->strategy == PARTITION_STRATEGY_HASH) ?
+ HASHEXTENDED_PROC : BTORDER_PROC;
+
+ /* Copy partattrs and fill other per-attribute info */
+ memcpy(key->partattrs, attrs, key->partnatts * sizeof(int16));
+ partexprs_item = list_head(key->partexprs);
+ for (i = 0; i < key->partnatts; i++)
+ {
+ AttrNumber attno = key->partattrs[i];
+ HeapTuple opclasstup;
+ Form_pg_opclass opclassform;
+ Oid funcid;
+
+ /* Collect opfamily information */
+ opclasstup = SearchSysCache1(CLAOID,
+ ObjectIdGetDatum(opclass->values[i]));
+ if (!HeapTupleIsValid(opclasstup))
+ elog(ERROR, "cache lookup failed for opclass %u", opclass->values[i]);
+
+ opclassform = (Form_pg_opclass) GETSTRUCT(opclasstup);
+ key->partopfamily[i] = opclassform->opcfamily;
+ key->partopcintype[i] = opclassform->opcintype;
+
+ /* Get a support function for the specified opfamily and datatypes */
+ funcid = get_opfamily_proc(opclassform->opcfamily,
+ opclassform->opcintype,
+ opclassform->opcintype,
+ procnum);
+ if (!OidIsValid(funcid))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
+ errmsg("operator class \"%s\" of access method %s is missing support function %d for type %s",
+ NameStr(opclassform->opcname),
+ (key->strategy == PARTITION_STRATEGY_HASH) ?
+ "hash" : "btree",
+ procnum,
+ format_type_be(opclassform->opcintype))));
+
+ fmgr_info_cxt(funcid, &key->partsupfunc[i], partkeycxt);
+
+ /* Collation */
+ key->partcollation[i] = collation->values[i];
+
+ /* Collect type information */
+ if (attno != 0)
+ {
+ Form_pg_attribute att = TupleDescAttr(relation->rd_att, attno - 1);
+
+ key->parttypid[i] = att->atttypid;
+ key->parttypmod[i] = att->atttypmod;
+ key->parttypcoll[i] = att->attcollation;
+ }
+ else
+ {
+ if (partexprs_item == NULL)
+ elog(ERROR, "wrong number of partition key expressions");
+
+ key->parttypid[i] = exprType(lfirst(partexprs_item));
+ key->parttypmod[i] = exprTypmod(lfirst(partexprs_item));
+ key->parttypcoll[i] = exprCollation(lfirst(partexprs_item));
+
+ partexprs_item = lnext(partexprs_item);
+ }
+ get_typlenbyvalalign(key->parttypid[i],
+ &key->parttyplen[i],
+ &key->parttypbyval[i],
+ &key->parttypalign[i]);
+
+ ReleaseSysCache(opclasstup);
+ }
+
+ ReleaseSysCache(tuple);
+
+ /*
+ * Success --- reparent our context and make the relcache point to the
+ * newly constructed key
+ */
+ MemoryContextSetParent(partkeycxt, CacheMemoryContext);
+ relation->rd_partkeycxt = partkeycxt;
+ relation->rd_partkey = key;
+}
+
+/*
+ * RelationBuildPartitionDesc
+ * Form rel's partition descriptor
+ *
+ * Not flushed from the cache by RelationClearRelation() unless changed because
+ * of addition or removal of partition.
+ */
+void
+RelationBuildPartitionDesc(Relation rel)
+{
+ List *inhoids,
+ *partoids;
+ Oid *oids = NULL;
+ List *boundspecs = NIL;
+ ListCell *cell;
+ int i,
+ nparts;
+ PartitionKey key = RelationGetPartitionKey(rel);
+ PartitionDesc result;
+ MemoryContext oldcxt;
+
+ int ndatums = 0;
+ int default_index = -1;
+
+ /* Hash partitioning specific */
+ PartitionHashBound **hbounds = NULL;
+
+ /* List partitioning specific */
+ PartitionListValue **all_values = NULL;
+ int null_index = -1;
+
+ /* Range partitioning specific */
+ PartitionRangeBound **rbounds = NULL;
+
+ /* Get partition oids from pg_inherits */
+ inhoids = find_inheritance_children(RelationGetRelid(rel), NoLock);
+
+ /* Collect bound spec nodes in a list */
+ i = 0;
+ partoids = NIL;
+ foreach(cell, inhoids)
+ {
+ Oid inhrelid = lfirst_oid(cell);
+ HeapTuple tuple;
+ Datum datum;
+ bool isnull;
+ Node *boundspec;
+
+ tuple = SearchSysCache1(RELOID, inhrelid);
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "cache lookup failed for relation %u", inhrelid);
+
+ /*
+ * It is possible that the pg_class tuple of a partition has not been
+ * updated yet to set its relpartbound field. The only case where
+ * this happens is when we open the parent relation to check using its
+ * partition descriptor that a new partition's bound does not overlap
+ * some existing partition.
+ */
+ if (!((Form_pg_class) GETSTRUCT(tuple))->relispartition)
+ {
+ ReleaseSysCache(tuple);
+ continue;
+ }
+
+ datum = SysCacheGetAttr(RELOID, tuple,
+ Anum_pg_class_relpartbound,
+ &isnull);
+ Assert(!isnull);
+ boundspec = (Node *) stringToNode(TextDatumGetCString(datum));
+
+ /*
+ * Sanity check: If the PartitionBoundSpec says this is the default
+ * partition, its OID should correspond to whatever's stored in
+ * pg_partitioned_table.partdefid; if not, the catalog is corrupt.
+ */
+ if (castNode(PartitionBoundSpec, boundspec)->is_default)
+ {
+ Oid partdefid;
+
+ partdefid = get_default_partition_oid(RelationGetRelid(rel));
+ if (partdefid != inhrelid)
+ elog(ERROR, "expected partdefid %u, but got %u",
+ inhrelid, partdefid);
+ }
+
+ boundspecs = lappend(boundspecs, boundspec);
+ partoids = lappend_oid(partoids, inhrelid);
+ ReleaseSysCache(tuple);
+ }
+
+ nparts = list_length(partoids);
+
+ if (nparts > 0)
+ {
+ oids = (Oid *) palloc(nparts * sizeof(Oid));
+ i = 0;
+ foreach(cell, partoids)
+ oids[i++] = lfirst_oid(cell);
+
+ /* Convert from node to the internal representation */
+ if (key->strategy == PARTITION_STRATEGY_HASH)
+ {
+ ndatums = nparts;
+ hbounds = (PartitionHashBound **)
+ palloc(nparts * sizeof(PartitionHashBound *));
+
+ i = 0;
+ foreach(cell, boundspecs)
+ {
+ PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
+ lfirst(cell));
+
+ if (spec->strategy != PARTITION_STRATEGY_HASH)
+ elog(ERROR, "invalid strategy in partition bound spec");
+
+ hbounds[i] = (PartitionHashBound *)
+ palloc(sizeof(PartitionHashBound));
+
+ hbounds[i]->modulus = spec->modulus;
+ hbounds[i]->remainder = spec->remainder;
+ hbounds[i]->index = i;
+ i++;
+ }
+
+ /* Sort all the bounds in ascending order */
+ qsort(hbounds, nparts, sizeof(PartitionHashBound *),
+ qsort_partition_hbound_cmp);
+ }
+ else if (key->strategy == PARTITION_STRATEGY_LIST)
+ {
+ List *non_null_values = NIL;
+
+ /*
+ * Create a unified list of non-null values across all partitions.
+ */
+ i = 0;
+ null_index = -1;
+ foreach(cell, boundspecs)
+ {
+ PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
+ lfirst(cell));
+ ListCell *c;
+
+ if (spec->strategy != PARTITION_STRATEGY_LIST)
+ elog(ERROR, "invalid strategy in partition bound spec");
+
+ /*
+ * Note the index of the partition bound spec for the default
+ * partition. There's no datum to add to the list of non-null
+ * datums for this partition.
+ */
+ if (spec->is_default)
+ {
+ default_index = i;
+ i++;
+ continue;
+ }
+
+ foreach(c, spec->listdatums)
+ {
+ Const *val = castNode(Const, lfirst(c));
+ PartitionListValue *list_value = NULL;
+
+ if (!val->constisnull)
+ {
+ list_value = (PartitionListValue *)
+ palloc0(sizeof(PartitionListValue));
+ list_value->index = i;
+ list_value->value = val->constvalue;
+ }
+ else
+ {
+ /*
+ * Never put a null into the values array, flag
+ * instead for the code further down below where we
+ * construct the actual relcache struct.
+ */
+ if (null_index != -1)
+ elog(ERROR, "found null more than once");
+ null_index = i;
+ }
+
+ if (list_value)
+ non_null_values = lappend(non_null_values,
+ list_value);
+ }
+
+ i++;
+ }
+
+ ndatums = list_length(non_null_values);
+
+ /*
+ * Collect all list values in one array. Alongside the value, we
+ * also save the index of partition the value comes from.
+ */
+ all_values = (PartitionListValue **) palloc(ndatums *
+ sizeof(PartitionListValue *));
+ i = 0;
+ foreach(cell, non_null_values)
+ {
+ PartitionListValue *src = lfirst(cell);
+
+ all_values[i] = (PartitionListValue *)
+ palloc(sizeof(PartitionListValue));
+ all_values[i]->value = src->value;
+ all_values[i]->index = src->index;
+ i++;
+ }
+
+ qsort_arg(all_values, ndatums, sizeof(PartitionListValue *),
+ qsort_partition_list_value_cmp, (void *) key);
+ }
+ else if (key->strategy == PARTITION_STRATEGY_RANGE)
+ {
+ int k;
+ PartitionRangeBound **all_bounds,
+ *prev;
+
+ all_bounds = (PartitionRangeBound **) palloc0(2 * nparts *
+ sizeof(PartitionRangeBound *));
+
+ /*
+ * Create a unified list of range bounds across all the
+ * partitions.
+ */
+ i = ndatums = 0;
+ foreach(cell, boundspecs)
+ {
+ PartitionBoundSpec *spec = castNode(PartitionBoundSpec,
+ lfirst(cell));
+ PartitionRangeBound *lower,
+ *upper;
+
+ if (spec->strategy != PARTITION_STRATEGY_RANGE)
+ elog(ERROR, "invalid strategy in partition bound spec");
+
+ /*
+ * Note the index of the partition bound spec for the default
+ * partition. There's no datum to add to the allbounds array
+ * for this partition.
+ */
+ if (spec->is_default)
+ {
+ default_index = i++;
+ continue;
+ }
+
+ lower = make_one_range_bound(key, i, spec->lowerdatums,
+ true);
+ upper = make_one_range_bound(key, i, spec->upperdatums,
+ false);
+ all_bounds[ndatums++] = lower;
+ all_bounds[ndatums++] = upper;
+ i++;
+ }
+
+ Assert(ndatums == nparts * 2 ||
+ (default_index != -1 && ndatums == (nparts - 1) * 2));
+
+ /* Sort all the bounds in ascending order */
+ qsort_arg(all_bounds, ndatums,
+ sizeof(PartitionRangeBound *),
+ qsort_partition_rbound_cmp,
+ (void *) key);
+
+ /* Save distinct bounds from all_bounds into rbounds. */
+ rbounds = (PartitionRangeBound **)
+ palloc(ndatums * sizeof(PartitionRangeBound *));
+ k = 0;
+ prev = NULL;
+ for (i = 0; i < ndatums; i++)
+ {
+ PartitionRangeBound *cur = all_bounds[i];
+ bool is_distinct = false;
+ int j;
+
+ /* Is the current bound distinct from the previous one? */
+ for (j = 0; j < key->partnatts; j++)
+ {
+ Datum cmpval;
+
+ if (prev == NULL || cur->kind[j] != prev->kind[j])
+ {
+ is_distinct = true;
+ break;
+ }
+
+ /*
+ * If the bounds are both MINVALUE or MAXVALUE, stop now
+ * and treat them as equal, since any values after this
+ * point must be ignored.
+ */
+ if (cur->kind[j] != PARTITION_RANGE_DATUM_VALUE)
+ break;
+
+ cmpval = FunctionCall2Coll(&key->partsupfunc[j],
+ key->partcollation[j],
+ cur->datums[j],
+ prev->datums[j]);
+ if (DatumGetInt32(cmpval) != 0)
+ {
+ is_distinct = true;
+ break;
+ }
+ }
+
+ /*
+ * Only if the bound is distinct save it into a temporary
+ * array i.e. rbounds which is later copied into boundinfo
+ * datums array.
+ */
+ if (is_distinct)
+ rbounds[k++] = all_bounds[i];
+
+ prev = cur;
+ }
+
+ /* Update ndatums to hold the count of distinct datums. */
+ ndatums = k;
+ }
+ else
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) key->strategy);
+ }
+
+ /* Now build the actual relcache partition descriptor */
+ rel->rd_pdcxt = AllocSetContextCreate(CacheMemoryContext,
+ "partition descriptor",
+ ALLOCSET_DEFAULT_SIZES);
+ MemoryContextCopyAndSetIdentifier(rel->rd_pdcxt, RelationGetRelationName(rel));
+
+ oldcxt = MemoryContextSwitchTo(rel->rd_pdcxt);
+
+ result = (PartitionDescData *) palloc0(sizeof(PartitionDescData));
+ result->nparts = nparts;
+ if (nparts > 0)
+ {
+ PartitionBoundInfo boundinfo;
+ int *mapping;
+ int next_index = 0;
+
+ result->oids = (Oid *) palloc0(nparts * sizeof(Oid));
+
+ boundinfo = (PartitionBoundInfoData *)
+ palloc0(sizeof(PartitionBoundInfoData));
+ boundinfo->strategy = key->strategy;
+ boundinfo->default_index = -1;
+ boundinfo->ndatums = ndatums;
+ boundinfo->null_index = -1;
+ boundinfo->datums = (Datum **) palloc0(ndatums * sizeof(Datum *));
+
+ /* Initialize mapping array with invalid values */
+ mapping = (int *) palloc(sizeof(int) * nparts);
+ for (i = 0; i < nparts; i++)
+ mapping[i] = -1;
+
+ switch (key->strategy)
+ {
+ case PARTITION_STRATEGY_HASH:
+ {
+ /* Modulus are stored in ascending order */
+ int greatest_modulus = hbounds[ndatums - 1]->modulus;
+
+ boundinfo->indexes = (int *) palloc(greatest_modulus *
+ sizeof(int));
+
+ for (i = 0; i < greatest_modulus; i++)
+ boundinfo->indexes[i] = -1;
+
+ for (i = 0; i < nparts; i++)
+ {
+ int modulus = hbounds[i]->modulus;
+ int remainder = hbounds[i]->remainder;
+
+ boundinfo->datums[i] = (Datum *) palloc(2 *
+ sizeof(Datum));
+ boundinfo->datums[i][0] = Int32GetDatum(modulus);
+ boundinfo->datums[i][1] = Int32GetDatum(remainder);
+
+ while (remainder < greatest_modulus)
+ {
+ /* overlap? */
+ Assert(boundinfo->indexes[remainder] == -1);
+ boundinfo->indexes[remainder] = i;
+ remainder += modulus;
+ }
+
+ mapping[hbounds[i]->index] = i;
+ pfree(hbounds[i]);
+ }
+ pfree(hbounds);
+ break;
+ }
+
+ case PARTITION_STRATEGY_LIST:
+ {
+ boundinfo->indexes = (int *) palloc(ndatums * sizeof(int));
+
+ /*
+ * Copy values. Indexes of individual values are mapped
+ * to canonical values so that they match for any two list
+ * partitioned tables with same number of partitions and
+ * same lists per partition. One way to canonicalize is
+ * to assign the index in all_values[] of the smallest
+ * value of each partition, as the index of all of the
+ * partition's values.
+ */
+ for (i = 0; i < ndatums; i++)
+ {
+ boundinfo->datums[i] = (Datum *) palloc(sizeof(Datum));
+ boundinfo->datums[i][0] = datumCopy(all_values[i]->value,
+ key->parttypbyval[0],
+ key->parttyplen[0]);
+
+ /* If the old index has no mapping, assign one */
+ if (mapping[all_values[i]->index] == -1)
+ mapping[all_values[i]->index] = next_index++;
+
+ boundinfo->indexes[i] = mapping[all_values[i]->index];
+ }
+
+ /*
+ * If null-accepting partition has no mapped index yet,
+ * assign one. This could happen if such partition
+ * accepts only null and hence not covered in the above
+ * loop which only handled non-null values.
+ */
+ if (null_index != -1)
+ {
+ Assert(null_index >= 0);
+ if (mapping[null_index] == -1)
+ mapping[null_index] = next_index++;
+ boundinfo->null_index = mapping[null_index];
+ }
+
+ /* Assign mapped index for the default partition. */
+ if (default_index != -1)
+ {
+ /*
+ * The default partition accepts any value not
+ * specified in the lists of other partitions, hence
+ * it should not get mapped index while assigning
+ * those for non-null datums.
+ */
+ Assert(default_index >= 0 &&
+ mapping[default_index] == -1);
+ mapping[default_index] = next_index++;
+ boundinfo->default_index = mapping[default_index];
+ }
+
+ /* All partition must now have a valid mapping */
+ Assert(next_index == nparts);
+ break;
+ }
+
+ case PARTITION_STRATEGY_RANGE:
+ {
+ boundinfo->kind = (PartitionRangeDatumKind **)
+ palloc(ndatums *
+ sizeof(PartitionRangeDatumKind *));
+ boundinfo->indexes = (int *) palloc((ndatums + 1) *
+ sizeof(int));
+
+ for (i = 0; i < ndatums; i++)
+ {
+ int j;
+
+ boundinfo->datums[i] = (Datum *) palloc(key->partnatts *
+ sizeof(Datum));
+ boundinfo->kind[i] = (PartitionRangeDatumKind *)
+ palloc(key->partnatts *
+ sizeof(PartitionRangeDatumKind));
+ for (j = 0; j < key->partnatts; j++)
+ {
+ if (rbounds[i]->kind[j] == PARTITION_RANGE_DATUM_VALUE)
+ boundinfo->datums[i][j] =
+ datumCopy(rbounds[i]->datums[j],
+ key->parttypbyval[j],
+ key->parttyplen[j]);
+ boundinfo->kind[i][j] = rbounds[i]->kind[j];
+ }
+
+ /*
+ * There is no mapping for invalid indexes.
+ *
+ * Any lower bounds in the rbounds array have invalid
+ * indexes assigned, because the values between the
+ * previous bound (if there is one) and this (lower)
+ * bound are not part of the range of any existing
+ * partition.
+ */
+ if (rbounds[i]->lower)
+ boundinfo->indexes[i] = -1;
+ else
+ {
+ int orig_index = rbounds[i]->index;
+
+ /* If the old index has no mapping, assign one */
+ if (mapping[orig_index] == -1)
+ mapping[orig_index] = next_index++;
+
+ boundinfo->indexes[i] = mapping[orig_index];
+ }
+ }
+
+ /* Assign mapped index for the default partition. */
+ if (default_index != -1)
+ {
+ Assert(default_index >= 0 && mapping[default_index] == -1);
+ mapping[default_index] = next_index++;
+ boundinfo->default_index = mapping[default_index];
+ }
+ boundinfo->indexes[i] = -1;
+ break;
+ }
+
+ default:
+ elog(ERROR, "unexpected partition strategy: %d",
+ (int) key->strategy);
+ }
+
+ result->boundinfo = boundinfo;
+
+ /*
+ * Now assign OIDs from the original array into mapped indexes of the
+ * result array. Order of OIDs in the former is defined by the
+ * catalog scan that retrieved them, whereas that in the latter is
+ * defined by canonicalized representation of the partition bounds.
+ */
+ for (i = 0; i < nparts; i++)
+ result->oids[mapping[i]] = oids[i];
+ pfree(mapping);
+ }
+
+ MemoryContextSwitchTo(oldcxt);
+ rel->rd_partdesc = result;
+}
+
+/*
+ * RelationGetPartitionQual
+ *
+ * Returns a list of partition quals
+ */
+List *
+RelationGetPartitionQual(Relation rel)
+{
+ /* Quick exit */
+ if (!rel->rd_rel->relispartition)
+ return NIL;
+
+ return generate_partition_qual(rel);
+}
+
+/*
+ * get_partition_qual_relid
+ *
+ * Returns an expression tree describing the passed-in relation's partition
+ * constraint. If there is no partition constraint returns NULL; this can
+ * happen if the default partition is the only partition.
+ */
+Expr *
+get_partition_qual_relid(Oid relid)
+{
+ Relation rel = heap_open(relid, AccessShareLock);
+ Expr *result = NULL;
+ List *and_args;
+
+ /* Do the work only if this relation is a partition. */
+ if (rel->rd_rel->relispartition)
+ {
+ and_args = generate_partition_qual(rel);
+
+ if (and_args == NIL)
+ result = NULL;
+ else if (list_length(and_args) > 1)
+ result = makeBoolExpr(AND_EXPR, and_args, -1);
+ else
+ result = linitial(and_args);
+ }
+
+ /* Keep the lock. */
+ heap_close(rel, NoLock);
+
+ return result;
+}
+
+/*
+ * generate_partition_qual
+ *
+ * Generate partition predicate from rel's partition bound expression. The
+ * function returns a NIL list if there is no predicate.
+ *
+ * Result expression tree is stored CacheMemoryContext to ensure it survives
+ * as long as the relcache entry. But we should be running in a less long-lived
+ * working context. To avoid leaking cache memory if this routine fails partway
+ * through, we build in working memory and then copy the completed structure
+ * into cache memory.
+ */
+static List *
+generate_partition_qual(Relation rel)
+{
+ HeapTuple tuple;
+ MemoryContext oldcxt;
+ Datum boundDatum;
+ bool isnull;
+ PartitionBoundSpec *bound;
+ List *my_qual = NIL,
+ *result = NIL;
+ Relation parent;
+ bool found_whole_row;
+
+ /* Guard against stack overflow due to overly deep partition tree */
+ check_stack_depth();
+
+ /* Quick copy */
+ if (rel->rd_partcheck != NIL)
+ return copyObject(rel->rd_partcheck);
+
+ /* Grab at least an AccessShareLock on the parent table */
+ parent = heap_open(get_partition_parent(RelationGetRelid(rel)),
+ AccessShareLock);
+
+ /* Get pg_class.relpartbound */
+ tuple = SearchSysCache1(RELOID, RelationGetRelid(rel));
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "cache lookup failed for relation %u",
+ RelationGetRelid(rel));
+
+ boundDatum = SysCacheGetAttr(RELOID, tuple,
+ Anum_pg_class_relpartbound,
+ &isnull);
+ if (isnull) /* should not happen */
+ elog(ERROR, "relation \"%s\" has relpartbound = null",
+ RelationGetRelationName(rel));
+ bound = castNode(PartitionBoundSpec,
+ stringToNode(TextDatumGetCString(boundDatum)));
+ ReleaseSysCache(tuple);
+
+ my_qual = get_qual_from_partbound(rel, parent, bound);
+
+ /* Add the parent's quals to the list (if any) */
+ if (parent->rd_rel->relispartition)
+ result = list_concat(generate_partition_qual(parent), my_qual);
+ else
+ result = my_qual;
+
+ /*
+ * Change Vars to have partition's attnos instead of the parent's. We do
+ * this after we concatenate the parent's quals, because we want every Var
+ * in it to bear this relation's attnos. It's safe to assume varno = 1
+ * here.
+ */
+ result = map_partition_varattnos(result, 1, rel, parent,
+ &found_whole_row);
+ /* There can never be a whole-row reference here */
+ if (found_whole_row)
+ elog(ERROR, "unexpected whole-row reference found in partition key");
+
+ /* Save a copy in the relcache */
+ oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+ rel->rd_partcheck = copyObject(result);
+ MemoryContextSwitchTo(oldcxt);
+
+ /* Keep the parent locked until commit */
+ heap_close(parent, NoLock);
+
+ return result;
+}
+
+/*
+ * qsort_partition_hbound_cmp
+ *
+ * We sort hash bounds by modulus, then by remainder.
+ */
+static int32
+qsort_partition_hbound_cmp(const void *a, const void *b)
+{
+ PartitionHashBound *h1 = (*(PartitionHashBound *const *) a);
+ PartitionHashBound *h2 = (*(PartitionHashBound *const *) b);
+
+ return partition_hbound_cmp(h1->modulus, h1->remainder,
+ h2->modulus, h2->remainder);
+}
+
+/*
+ * qsort_partition_list_value_cmp
+ *
+ * Compare two list partition bound datums
+ */
+static int32
+qsort_partition_list_value_cmp(const void *a, const void *b, void *arg)
+{
+ Datum val1 = (*(const PartitionListValue **) a)->value,
+ val2 = (*(const PartitionListValue **) b)->value;
+ PartitionKey key = (PartitionKey) arg;
+
+ return DatumGetInt32(FunctionCall2Coll(&key->partsupfunc[0],
+ key->partcollation[0],
+ val1, val2));
+}
+
+/* Used when sorting range bounds across all range partitions */
+static int32
+qsort_partition_rbound_cmp(const void *a, const void *b, void *arg)
+{
+ PartitionRangeBound *b1 = (*(PartitionRangeBound *const *) a);
+ PartitionRangeBound *b2 = (*(PartitionRangeBound *const *) b);
+ PartitionKey key = (PartitionKey) arg;
+
+ return partition_rbound_cmp(key->partnatts, key->partsupfunc,
+ key->partcollation, b1->datums, b1->kind,
+ b1->lower, b2);
+}
#include "optimizer/cost.h"
#include "optimizer/prep.h"
#include "optimizer/var.h"
+#include "partitioning/partbounds.h"
#include "pgstat.h"
#include "rewrite/rewriteDefine.h"
#include "rewrite/rowsecurity.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/partcache.h"
#include "utils/relmapper.h"
#include "utils/resowner_private.h"
#include "utils/snapmgr.h"
static Relation AllocateRelationDesc(Form_pg_class relp);
static void RelationParseRelOptions(Relation relation, HeapTuple tuple);
static void RelationBuildTupleDesc(Relation relation);
-static void RelationBuildPartitionKey(Relation relation);
static Relation RelationBuildDesc(Oid targetRelId, bool insertIt);
static void RelationInitPhysicalAddr(Relation relation);
static void load_critical_index(Oid indexoid, Oid heapoid);
relation->rd_rules = rulelock;
}
-/*
- * RelationBuildPartitionKey
- * Build and attach to relcache partition key data of relation
- *
- * Partitioning key data is a complex structure; to avoid complicated logic to
- * free individual elements whenever the relcache entry is flushed, we give it
- * its own memory context, child of CacheMemoryContext, which can easily be
- * deleted on its own. To avoid leaking memory in that context in case of an
- * error partway through this function, the context is initially created as a
- * child of CurTransactionContext and only re-parented to CacheMemoryContext
- * at the end, when no further errors are possible. Also, we don't make this
- * context the current context except in very brief code sections, out of fear
- * that some of our callees allocate memory on their own which would be leaked
- * permanently.
- */
-static void
-RelationBuildPartitionKey(Relation relation)
-{
- Form_pg_partitioned_table form;
- HeapTuple tuple;
- bool isnull;
- int i;
- PartitionKey key;
- AttrNumber *attrs;
- oidvector *opclass;
- oidvector *collation;
- ListCell *partexprs_item;
- Datum datum;
- MemoryContext partkeycxt,
- oldcxt;
- int16 procnum;
-
- tuple = SearchSysCache1(PARTRELID,
- ObjectIdGetDatum(RelationGetRelid(relation)));
-
- /*
- * The following happens when we have created our pg_class entry but not
- * the pg_partitioned_table entry yet.
- */
- if (!HeapTupleIsValid(tuple))
- return;
-
- partkeycxt = AllocSetContextCreate(CurTransactionContext,
- "partition key",
- ALLOCSET_SMALL_SIZES);
- MemoryContextCopyAndSetIdentifier(partkeycxt,
- RelationGetRelationName(relation));
-
- key = (PartitionKey) MemoryContextAllocZero(partkeycxt,
- sizeof(PartitionKeyData));
-
- /* Fixed-length attributes */
- form = (Form_pg_partitioned_table) GETSTRUCT(tuple);
- key->strategy = form->partstrat;
- key->partnatts = form->partnatts;
-
- /*
- * We can rely on the first variable-length attribute being mapped to the
- * relevant field of the catalog's C struct, because all previous
- * attributes are non-nullable and fixed-length.
- */
- attrs = form->partattrs.values;
-
- /* But use the hard way to retrieve further variable-length attributes */
- /* Operator class */
- datum = SysCacheGetAttr(PARTRELID, tuple,
- Anum_pg_partitioned_table_partclass, &isnull);
- Assert(!isnull);
- opclass = (oidvector *) DatumGetPointer(datum);
-
- /* Collation */
- datum = SysCacheGetAttr(PARTRELID, tuple,
- Anum_pg_partitioned_table_partcollation, &isnull);
- Assert(!isnull);
- collation = (oidvector *) DatumGetPointer(datum);
-
- /* Expressions */
- datum = SysCacheGetAttr(PARTRELID, tuple,
- Anum_pg_partitioned_table_partexprs, &isnull);
- if (!isnull)
- {
- char *exprString;
- Node *expr;
-
- exprString = TextDatumGetCString(datum);
- expr = stringToNode(exprString);
- pfree(exprString);
-
- /*
- * Run the expressions through const-simplification since the planner
- * will be comparing them to similarly-processed qual clause operands,
- * and may fail to detect valid matches without this step; fix
- * opfuncids while at it. We don't need to bother with
- * canonicalize_qual() though, because partition expressions should be
- * in canonical form already (ie, no need for OR-merging or constant
- * elimination).
- */
- expr = eval_const_expressions(NULL, expr);
- fix_opfuncids(expr);
-
- oldcxt = MemoryContextSwitchTo(partkeycxt);
- key->partexprs = (List *) copyObject(expr);
- MemoryContextSwitchTo(oldcxt);
- }
-
- oldcxt = MemoryContextSwitchTo(partkeycxt);
- key->partattrs = (AttrNumber *) palloc0(key->partnatts * sizeof(AttrNumber));
- key->partopfamily = (Oid *) palloc0(key->partnatts * sizeof(Oid));
- key->partopcintype = (Oid *) palloc0(key->partnatts * sizeof(Oid));
- key->partsupfunc = (FmgrInfo *) palloc0(key->partnatts * sizeof(FmgrInfo));
-
- key->partcollation = (Oid *) palloc0(key->partnatts * sizeof(Oid));
-
- /* Gather type and collation info as well */
- key->parttypid = (Oid *) palloc0(key->partnatts * sizeof(Oid));
- key->parttypmod = (int32 *) palloc0(key->partnatts * sizeof(int32));
- key->parttyplen = (int16 *) palloc0(key->partnatts * sizeof(int16));
- key->parttypbyval = (bool *) palloc0(key->partnatts * sizeof(bool));
- key->parttypalign = (char *) palloc0(key->partnatts * sizeof(char));
- key->parttypcoll = (Oid *) palloc0(key->partnatts * sizeof(Oid));
- MemoryContextSwitchTo(oldcxt);
-
- /* determine support function number to search for */
- procnum = (key->strategy == PARTITION_STRATEGY_HASH) ?
- HASHEXTENDED_PROC : BTORDER_PROC;
-
- /* Copy partattrs and fill other per-attribute info */
- memcpy(key->partattrs, attrs, key->partnatts * sizeof(int16));
- partexprs_item = list_head(key->partexprs);
- for (i = 0; i < key->partnatts; i++)
- {
- AttrNumber attno = key->partattrs[i];
- HeapTuple opclasstup;
- Form_pg_opclass opclassform;
- Oid funcid;
-
- /* Collect opfamily information */
- opclasstup = SearchSysCache1(CLAOID,
- ObjectIdGetDatum(opclass->values[i]));
- if (!HeapTupleIsValid(opclasstup))
- elog(ERROR, "cache lookup failed for opclass %u", opclass->values[i]);
-
- opclassform = (Form_pg_opclass) GETSTRUCT(opclasstup);
- key->partopfamily[i] = opclassform->opcfamily;
- key->partopcintype[i] = opclassform->opcintype;
-
- /* Get a support function for the specified opfamily and datatypes */
- funcid = get_opfamily_proc(opclassform->opcfamily,
- opclassform->opcintype,
- opclassform->opcintype,
- procnum);
- if (!OidIsValid(funcid))
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
- errmsg("operator class \"%s\" of access method %s is missing support function %d for type %s",
- NameStr(opclassform->opcname),
- (key->strategy == PARTITION_STRATEGY_HASH) ?
- "hash" : "btree",
- procnum,
- format_type_be(opclassform->opcintype))));
-
- fmgr_info_cxt(funcid, &key->partsupfunc[i], partkeycxt);
-
- /* Collation */
- key->partcollation[i] = collation->values[i];
-
- /* Collect type information */
- if (attno != 0)
- {
- Form_pg_attribute att = TupleDescAttr(relation->rd_att, attno - 1);
-
- key->parttypid[i] = att->atttypid;
- key->parttypmod[i] = att->atttypmod;
- key->parttypcoll[i] = att->attcollation;
- }
- else
- {
- if (partexprs_item == NULL)
- elog(ERROR, "wrong number of partition key expressions");
-
- key->parttypid[i] = exprType(lfirst(partexprs_item));
- key->parttypmod[i] = exprTypmod(lfirst(partexprs_item));
- key->parttypcoll[i] = exprCollation(lfirst(partexprs_item));
-
- partexprs_item = lnext(partexprs_item);
- }
- get_typlenbyvalalign(key->parttypid[i],
- &key->parttyplen[i],
- &key->parttypbyval[i],
- &key->parttypalign[i]);
-
- ReleaseSysCache(opclasstup);
- }
-
- ReleaseSysCache(tuple);
-
- /*
- * Success --- reparent our context and make the relcache point to the
- * newly constructed key
- */
- MemoryContextSetParent(partkeycxt, CacheMemoryContext);
- relation->rd_partkeycxt = partkeycxt;
- relation->rd_partkey = key;
-}
-
/*
* equalRuleLocks
*
#include "postgres.h"
-#include "funcapi.h"
-#include "miscadmin.h"
#include "access/htup_details.h"
#include "access/xlog_internal.h"
+#include "access/xlog.h"
#include "catalog/pg_control.h"
#include "catalog/pg_type.h"
#include "common/controldata_utils.h"
+#include "funcapi.h"
+#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/timestamp.h"
#define PARTITION_H
#include "fmgr.h"
-#include "executor/tuptable.h"
-#include "nodes/execnodes.h"
-#include "parser/parse_node.h"
-#include "utils/rel.h"
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
/* Seed for the extended hash function */
#define HASH_PARTITION_SEED UINT64CONST(0x7A5B22367996DCFD)
-/*
- * PartitionBoundInfo encapsulates a set of partition bounds. It is usually
- * associated with partitioned tables as part of its partition descriptor.
- *
- * The internal structure appears in partbounds.h.
- */
-typedef struct PartitionBoundInfoData *PartitionBoundInfo;
-
/*
* Information about partitions of a partitioned table.
*/
PartitionBoundInfo boundinfo; /* collection of partition bounds */
} PartitionDescData;
-typedef struct PartitionDescData *PartitionDesc;
-
-extern void RelationBuildPartitionDesc(Relation relation);
-extern bool partition_bounds_equal(int partnatts, int16 *parttyplen,
- bool *parttypbyval, PartitionBoundInfo b1,
- PartitionBoundInfo b2);
-extern PartitionBoundInfo partition_bounds_copy(PartitionBoundInfo src,
- PartitionKey key);
-
-extern void check_new_partition_bound(char *relname, Relation parent,
- PartitionBoundSpec *spec);
extern Oid get_partition_parent(Oid relid);
extern List *get_partition_ancestors(Oid relid);
-extern List *get_qual_from_partbound(Relation rel, Relation parent,
- PartitionBoundSpec *spec);
extern List *map_partition_varattnos(List *expr, int fromrel_varno,
Relation to_rel, Relation from_rel,
bool *found_whole_row);
-extern List *RelationGetPartitionQual(Relation rel);
-extern Expr *get_partition_qual_relid(Oid relid);
extern bool has_partition_attrs(Relation rel, Bitmapset *attnums,
bool *used_in_expr);
extern Oid get_default_oid_from_partdesc(PartitionDesc partdesc);
extern Oid get_default_partition_oid(Oid parentId);
extern void update_default_partition_oid(Oid parentId, Oid defaultPartId);
-extern void check_default_allows_bound(Relation parent, Relation defaultRel,
- PartitionBoundSpec *new_spec);
extern List *get_proposed_default_constraint(List *new_part_constaints);
-extern int get_partition_for_tuple(Relation relation, Datum *values,
- bool *isnull);
-
#endif /* PARTITION_H */
#include "catalog/dependency.h"
#include "catalog/objectaddress.h"
#include "nodes/parsenodes.h"
-#include "catalog/partition.h"
#include "storage/lock.h"
#include "utils/relcache.h"
#ifndef EXECPARTITION_H
#define EXECPARTITION_H
-#include "catalog/partition.h"
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#ifndef EXECUTOR_H
#define EXECUTOR_H
-#include "catalog/partition.h"
#include "executor/execdesc.h"
#include "nodes/parsenodes.h"
#include "utils/memutils.h"
#include "nodes/lockoptions.h"
#include "nodes/primnodes.h"
#include "nodes/value.h"
+#include "partitioning/partdefs.h"
+
typedef enum OverridingKind
{
* This represents the portion of the partition key space assigned to a
* particular partition. These are stored on disk in pg_class.relpartbound.
*/
-typedef struct PartitionBoundSpec
+struct PartitionBoundSpec
{
NodeTag type;
List *upperdatums; /* List of PartitionRangeDatums */
int location; /* token location, or -1 if unknown */
-} PartitionBoundSpec;
+};
/*
* PartitionRangeDatum - one of the values in a range partition bound
#ifndef PARTBOUNDS_H
#define PARTBOUNDS_H
-#include "catalog/partition.h"
+#include "fmgr.h"
+#include "nodes/parsenodes.h"
+#include "nodes/pg_list.h"
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
/*
} PartitionRangeBound;
extern int get_hash_partition_greatest_modulus(PartitionBoundInfo b);
-extern int partition_list_bsearch(FmgrInfo *partsupfunc, Oid *partcollation,
+extern uint64 compute_hash_value(int partnatts, FmgrInfo *partsupfunc,
+ Datum *values, bool *isnull);
+extern List *get_qual_from_partbound(Relation rel, Relation parent,
+ PartitionBoundSpec *spec);
+extern bool partition_bounds_equal(int partnatts, int16 *parttyplen,
+ bool *parttypbyval, PartitionBoundInfo b1,
+ PartitionBoundInfo b2);
+extern PartitionBoundInfo partition_bounds_copy(PartitionBoundInfo src,
+ PartitionKey key);
+extern void check_new_partition_bound(char *relname, Relation parent,
+ PartitionBoundSpec *spec);
+extern void check_default_allows_bound(Relation parent, Relation defaultRel,
+ PartitionBoundSpec *new_spec);
+
+extern PartitionRangeBound *make_one_range_bound(PartitionKey key, int index,
+ List *datums, bool lower);
+extern int32 partition_hbound_cmp(int modulus1, int remainder1, int modulus2,
+ int remainder2);
+extern int32 partition_rbound_cmp(int partnatts, FmgrInfo *partsupfunc,
+ Oid *partcollation, Datum *datums1,
+ PartitionRangeDatumKind *kind1, bool lower1,
+ PartitionRangeBound *b2);
+extern int32 partition_rbound_datum_cmp(FmgrInfo *partsupfunc,
+ Oid *partcollation,
+ Datum *rb_datums, PartitionRangeDatumKind *rb_kind,
+ Datum *tuple_datums, int n_tuple_datums);
+extern int partition_list_bsearch(FmgrInfo *partsupfunc,
+ Oid *partcollation,
PartitionBoundInfo boundinfo,
Datum value, bool *is_equal);
extern int partition_range_bsearch(int partnatts, FmgrInfo *partsupfunc,
int nvalues, Datum *values, bool *is_equal);
extern int partition_hash_bsearch(PartitionBoundInfo boundinfo,
int modulus, int remainder);
-extern uint64 compute_hash_value(int partnatts, FmgrInfo *partsupfunc,
- Datum *values, bool *isnull);
-extern int32 partition_rbound_datum_cmp(FmgrInfo *partsupfunc,
- Oid *partcollation,
- Datum *rb_datums, PartitionRangeDatumKind *rb_kind,
- Datum *tuple_datums, int n_tuple_datums);
#endif /* PARTBOUNDS_H */
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * partdefs.h
+ * Base definitions for partitioned table handling
+ *
+ * Copyright (c) 2007-2018, PostgreSQL Global Development Group
+ *
+ * src/include/partitioning/partdefs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARTDEFS_H
+#define PARTDEFS_H
+
+
+typedef struct PartitionBoundInfoData *PartitionBoundInfo;
+
+typedef struct PartitionKeyData *PartitionKey;
+
+typedef struct PartitionBoundSpec PartitionBoundSpec;
+
+typedef struct PartitionDescData *PartitionDesc;
+
+#endif /* PARTDEFS_H */
#ifndef PARTPRUNE_H
#define PARTPRUNE_H
-#include "catalog/partition.h"
+#include "nodes/execnodes.h"
#include "nodes/relation.h"
+
/*
* PartitionPruneContext
*
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * partcache.h
+ *
+ * Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ *
+ * src/include/utils/partcache.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARTCACHE_H
+#define PARTCACHE_H
+
+#include "access/attnum.h"
+#include "fmgr.h"
+#include "nodes/pg_list.h"
+#include "nodes/primnodes.h"
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
+
+/*
+ * Information about the partition key of a relation
+ */
+typedef struct PartitionKeyData
+{
+ char strategy; /* partitioning strategy */
+ int16 partnatts; /* number of columns in the partition key */
+ AttrNumber *partattrs; /* attribute numbers of columns in the
+ * partition key */
+ List *partexprs; /* list of expressions in the partitioning
+ * key, or NIL */
+
+ Oid *partopfamily; /* OIDs of operator families */
+ Oid *partopcintype; /* OIDs of opclass declared input data types */
+ FmgrInfo *partsupfunc; /* lookup info for support funcs */
+
+ /* Partitioning collation per attribute */
+ Oid *partcollation;
+
+ /* Type information per attribute */
+ Oid *parttypid;
+ int32 *parttypmod;
+ int16 *parttyplen;
+ bool *parttypbyval;
+ char *parttypalign;
+ Oid *parttypcoll;
+} PartitionKeyData;
+
+extern void RelationBuildPartitionKey(Relation relation);
+extern void RelationBuildPartitionDesc(Relation rel);
+extern List *RelationGetPartitionQual(Relation rel);
+extern Expr *get_partition_qual_relid(Oid relid);
+
+/*
+ * PartitionKey inquiry functions
+ */
+static inline int
+get_partition_strategy(PartitionKey key)
+{
+ return key->strategy;
+}
+
+static inline int
+get_partition_natts(PartitionKey key)
+{
+ return key->partnatts;
+}
+
+static inline List *
+get_partition_exprs(PartitionKey key)
+{
+ return key->partexprs;
+}
+
+/*
+ * PartitionKey inquiry functions - one column
+ */
+static inline int16
+get_partition_col_attnum(PartitionKey key, int col)
+{
+ return key->partattrs[col];
+}
+
+static inline Oid
+get_partition_col_typid(PartitionKey key, int col)
+{
+ return key->parttypid[col];
+}
+
+static inline int32
+get_partition_col_typmod(PartitionKey key, int col)
+{
+ return key->parttypmod[col];
+}
+
+#endif /* PARTCACHE_H */
typedef LockInfoData *LockInfo;
-/*
- * Information about the partition key of a relation
- */
-typedef struct PartitionKeyData
-{
- char strategy; /* partitioning strategy */
- int16 partnatts; /* number of columns in the partition key */
- AttrNumber *partattrs; /* attribute numbers of columns in the
- * partition key */
- List *partexprs; /* list of expressions in the partitioning
- * key, or NIL */
-
- Oid *partopfamily; /* OIDs of operator families */
- Oid *partopcintype; /* OIDs of opclass declared input data types */
- FmgrInfo *partsupfunc; /* lookup info for support funcs */
-
- /* Partitioning collation per attribute */
- Oid *partcollation;
-
- /* Type information per attribute */
- Oid *parttypid;
- int32 *parttypmod;
- int16 *parttyplen;
- bool *parttypbyval;
- char *parttypalign;
- Oid *parttypcoll;
-} PartitionKeyData;
-
-typedef struct PartitionKeyData *PartitionKey;
-
/*
* Here are the contents of a relation cache entry.
*/
*/
#define RelationGetPartitionKey(relation) ((relation)->rd_partkey)
-/*
- * PartitionKey inquiry functions
- */
-static inline int
-get_partition_strategy(PartitionKey key)
-{
- return key->strategy;
-}
-
-static inline int
-get_partition_natts(PartitionKey key)
-{
- return key->partnatts;
-}
-
-static inline List *
-get_partition_exprs(PartitionKey key)
-{
- return key->partexprs;
-}
-
-/*
- * PartitionKey inquiry functions - one column
- */
-static inline int16
-get_partition_col_attnum(PartitionKey key, int col)
-{
- return key->partattrs[col];
-}
-
-static inline Oid
-get_partition_col_typid(PartitionKey key, int col)
-{
- return key->parttypid[col];
-}
-
-static inline int32
-get_partition_col_typmod(PartitionKey key, int col)
-{
- return key->parttypmod[col];
-}
-
/*
* RelationGetPartitionDesc
* Returns partition descriptor for a relation.
projects / postgresql / commitdiff