* and implementing search-path-controlled searches.
*
*
- * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.115 2008/12/18 18:20:33 tgl Exp $
+ * src/backend/catalog/namespace.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
+#include "access/htup_details.h"
+#include "access/parallel.h"
#include "access/xact.h"
+#include "access/xlog.h"
#include "catalog/dependency.h"
-#include "catalog/namespace.h"
+#include "catalog/objectaccess.h"
#include "catalog/pg_authid.h"
+#include "catalog/pg_collation.h"
#include "catalog/pg_conversion.h"
#include "catalog/pg_conversion_fn.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_ts_template.h"
#include "catalog/pg_type.h"
#include "commands/dbcommands.h"
+#include "funcapi.h"
+#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "parser/parse_func.h"
-#include "storage/backendid.h"
#include "storage/ipc.h"
+#include "storage/lmgr.h"
+#include "storage/sinval.h"
#include "utils/acl.h"
#include "utils/builtins.h"
+#include "utils/catcache.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
-#include "utils/rel.h"
#include "utils/syscache.h"
* when we are obeying an override search path spec that says not to use the
* temp namespace, or the temp namespace is included in the explicit list.)
*
- * 2. The system catalog namespace is always searched. If the system
+ * 2. The system catalog namespace is always searched. If the system
* namespace is present in the explicit path then it will be searched in
* the specified order; otherwise it will be searched after TEMP tables and
- * *before* the explicit list. (It might seem that the system namespace
+ * *before* the explicit list. (It might seem that the system namespace
* should be implicitly last, but this behavior appears to be required by
* SQL99. Also, this provides a way to search the system namespace first
* without thereby making it the default creation target namespace.)
* to refer to the current backend's temp namespace. This is usually also
* ignorable if the temp namespace hasn't been set up, but there's a special
* case: if "pg_temp" appears first then it should be the default creation
- * target. We kluge this case a little bit so that the temp namespace isn't
+ * target. We kluge this case a little bit so that the temp namespace isn't
* set up until the first attempt to create something in it. (The reason for
* klugery is that we can't create the temp namespace outside a transaction,
* but initial GUC processing of search_path happens outside a transaction.)
* In bootstrap mode, the search path is set equal to "pg_catalog", so that
* the system namespace is the only one searched or inserted into.
* initdb is also careful to set search_path to "pg_catalog" for its
- * post-bootstrap standalone backend runs. Otherwise the default search
+ * post-bootstrap standalone backend runs. Otherwise the default search
* path is determined by GUC. The factory default path contains the PUBLIC
* namespace (if it exists), preceded by the user's personal namespace
* (if one exists).
/*
* myTempNamespace is InvalidOid until and unless a TEMP namespace is set up
* in a particular backend session (this happens when a CREATE TEMP TABLE
- * command is first executed). Thereafter it's the OID of the temp namespace.
+ * command is first executed). Thereafter it's the OID of the temp namespace.
*
* myTempToastNamespace is the OID of the namespace for my temp tables' toast
- * tables. It is set when myTempNamespace is, and is InvalidOid before that.
+ * tables. It is set when myTempNamespace is, and is InvalidOid before that.
*
* myTempNamespaceSubID shows whether we've created the TEMP namespace in the
- * current subtransaction. The flag propagates up the subtransaction tree,
+ * current subtransaction. The flag propagates up the subtransaction tree,
* so the main transaction will correctly recognize the flag if all
* intermediate subtransactions commit. When it is InvalidSubTransactionId,
* we either haven't made the TEMP namespace yet, or have successfully
static void InitTempTableNamespace(void);
static void RemoveTempRelations(Oid tempNamespaceId);
static void RemoveTempRelationsCallback(int code, Datum arg);
-static void NamespaceCallback(Datum arg, int cacheid, ItemPointer tuplePtr);
+static void NamespaceCallback(Datum arg, int cacheid, uint32 hashvalue);
+static bool MatchNamedCall(HeapTuple proctup, int nargs, List *argnames,
+ int **argnumbers);
/* These don't really need to appear in any header file */
Datum pg_table_is_visible(PG_FUNCTION_ARGS);
Datum pg_function_is_visible(PG_FUNCTION_ARGS);
Datum pg_operator_is_visible(PG_FUNCTION_ARGS);
Datum pg_opclass_is_visible(PG_FUNCTION_ARGS);
+Datum pg_opfamily_is_visible(PG_FUNCTION_ARGS);
+Datum pg_collation_is_visible(PG_FUNCTION_ARGS);
Datum pg_conversion_is_visible(PG_FUNCTION_ARGS);
Datum pg_ts_parser_is_visible(PG_FUNCTION_ARGS);
Datum pg_ts_dict_is_visible(PG_FUNCTION_ARGS);
* Given a RangeVar describing an existing relation,
* select the proper namespace and look up the relation OID.
*
- * If the relation is not found, return InvalidOid if failOK = true,
- * otherwise raise an error.
+ * If the schema or relation is not found, return InvalidOid if missing_ok
+ * = true, otherwise raise an error.
+ *
+ * If nowait = true, throw an error if we'd have to wait for a lock.
+ *
+ * Callback allows caller to check permissions or acquire additional locks
+ * prior to grabbing the relation lock.
*/
Oid
-RangeVarGetRelid(const RangeVar *relation, bool failOK)
+RangeVarGetRelidExtended(const RangeVar *relation, LOCKMODE lockmode,
+ bool missing_ok, bool nowait,
+ RangeVarGetRelidCallback callback, void *callback_arg)
{
- Oid namespaceId;
+ uint64 inval_count;
Oid relId;
+ Oid oldRelId = InvalidOid;
+ bool retry = false;
/*
* We check the catalog name and then ignore it.
}
/*
- * If istemp is set, this is a reference to a temp relation. The parser
- * never generates such a RangeVar in simple DML, but it can happen in
- * contexts such as "CREATE TEMP TABLE foo (f1 int PRIMARY KEY)". Such a
- * command will generate an added CREATE INDEX operation, which must be
- * careful to find the temp table, even when pg_temp is not first in the
- * search path.
+ * DDL operations can change the results of a name lookup. Since all such
+ * operations will generate invalidation messages, we keep track of
+ * whether any such messages show up while we're performing the operation,
+ * and retry until either (1) no more invalidation messages show up or (2)
+ * the answer doesn't change.
+ *
+ * But if lockmode = NoLock, then we assume that either the caller is OK
+ * with the answer changing under them, or that they already hold some
+ * appropriate lock, and therefore return the first answer we get without
+ * checking for invalidation messages. Also, if the requested lock is
+ * already held, LockRelationOid will not AcceptInvalidationMessages, so
+ * we may fail to notice a change. We could protect against that case by
+ * calling AcceptInvalidationMessages() before beginning this loop, but
+ * that would add a significant amount overhead, so for now we don't.
*/
- if (relation->istemp)
- {
- if (relation->schemaname)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
- errmsg("temporary tables cannot specify a schema name")));
- if (OidIsValid(myTempNamespace))
- relId = get_relname_relid(relation->relname, myTempNamespace);
- else /* this probably can't happen? */
- relId = InvalidOid;
- }
- else if (relation->schemaname)
- {
- /* use exact schema given */
- namespaceId = LookupExplicitNamespace(relation->schemaname);
- relId = get_relname_relid(relation->relname, namespaceId);
- }
- else
+ for (;;)
{
- /* search the namespace path */
- relId = RelnameGetRelid(relation->relname);
+ /*
+ * Remember this value, so that, after looking up the relation name
+ * and locking its OID, we can check whether any invalidation messages
+ * have been processed that might require a do-over.
+ */
+ inval_count = SharedInvalidMessageCounter;
+
+ /*
+ * Some non-default relpersistence value may have been specified. The
+ * parser never generates such a RangeVar in simple DML, but it can
+ * happen in contexts such as "CREATE TEMP TABLE foo (f1 int PRIMARY
+ * KEY)". Such a command will generate an added CREATE INDEX
+ * operation, which must be careful to find the temp table, even when
+ * pg_temp is not first in the search path.
+ */
+ if (relation->relpersistence == RELPERSISTENCE_TEMP)
+ {
+ if (!OidIsValid(myTempNamespace))
+ relId = InvalidOid; /* this probably can't happen? */
+ else
+ {
+ if (relation->schemaname)
+ {
+ Oid namespaceId;
+
+ namespaceId = LookupExplicitNamespace(relation->schemaname, missing_ok);
+
+ /*
+ * For missing_ok, allow a non-existant schema name to
+ * return InvalidOid.
+ */
+ if (namespaceId != myTempNamespace)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+ errmsg("temporary tables cannot specify a schema name")));
+ }
+
+ relId = get_relname_relid(relation->relname, myTempNamespace);
+ }
+ }
+ else if (relation->schemaname)
+ {
+ Oid namespaceId;
+
+ /* use exact schema given */
+ namespaceId = LookupExplicitNamespace(relation->schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ relId = InvalidOid;
+ else
+ relId = get_relname_relid(relation->relname, namespaceId);
+ }
+ else
+ {
+ /* search the namespace path */
+ relId = RelnameGetRelid(relation->relname);
+ }
+
+ /*
+ * Invoke caller-supplied callback, if any.
+ *
+ * This callback is a good place to check permissions: we haven't
+ * taken the table lock yet (and it's really best to check permissions
+ * before locking anything!), but we've gotten far enough to know what
+ * OID we think we should lock. Of course, concurrent DDL might
+ * change things while we're waiting for the lock, but in that case
+ * the callback will be invoked again for the new OID.
+ */
+ if (callback)
+ callback(relation, relId, oldRelId, callback_arg);
+
+ /*
+ * If no lock requested, we assume the caller knows what they're
+ * doing. They should have already acquired a heavyweight lock on
+ * this relation earlier in the processing of this same statement, so
+ * it wouldn't be appropriate to AcceptInvalidationMessages() here, as
+ * that might pull the rug out from under them.
+ */
+ if (lockmode == NoLock)
+ break;
+
+ /*
+ * If, upon retry, we get back the same OID we did last time, then the
+ * invalidation messages we processed did not change the final answer.
+ * So we're done.
+ *
+ * If we got a different OID, we've locked the relation that used to
+ * have this name rather than the one that does now. So release the
+ * lock.
+ */
+ if (retry)
+ {
+ if (relId == oldRelId)
+ break;
+ if (OidIsValid(oldRelId))
+ UnlockRelationOid(oldRelId, lockmode);
+ }
+
+ /*
+ * Lock relation. This will also accept any pending invalidation
+ * messages. If we got back InvalidOid, indicating not found, then
+ * there's nothing to lock, but we accept invalidation messages
+ * anyway, to flush any negative catcache entries that may be
+ * lingering.
+ */
+ if (!OidIsValid(relId))
+ AcceptInvalidationMessages();
+ else if (!nowait)
+ LockRelationOid(relId, lockmode);
+ else if (!ConditionalLockRelationOid(relId, lockmode))
+ {
+ if (relation->schemaname)
+ ereport(ERROR,
+ (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
+ errmsg("could not obtain lock on relation \"%s.%s\"",
+ relation->schemaname, relation->relname)));
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_LOCK_NOT_AVAILABLE),
+ errmsg("could not obtain lock on relation \"%s\"",
+ relation->relname)));
+ }
+
+ /*
+ * If no invalidation message were processed, we're done!
+ */
+ if (inval_count == SharedInvalidMessageCounter)
+ break;
+
+ /*
+ * Something may have changed. Let's repeat the name lookup, to make
+ * sure this name still references the same relation it did
+ * previously.
+ */
+ retry = true;
+ oldRelId = relId;
}
- if (!OidIsValid(relId) && !failOK)
+ if (!OidIsValid(relId) && !missing_ok)
{
if (relation->schemaname)
ereport(ERROR,
newRelation->relname)));
}
- if (newRelation->istemp)
- {
- /* TEMP tables are created in our backend-local temp namespace */
- if (newRelation->schemaname)
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
- errmsg("temporary tables cannot specify a schema name")));
- /* Initialize temp namespace if first time through */
- if (!OidIsValid(myTempNamespace))
- InitTempTableNamespace();
- return myTempNamespace;
- }
-
if (newRelation->schemaname)
{
/* check for pg_temp alias */
return myTempNamespace;
}
/* use exact schema given */
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(newRelation->schemaname),
- 0, 0, 0);
- if (!OidIsValid(namespaceId))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_SCHEMA),
- errmsg("schema \"%s\" does not exist",
- newRelation->schemaname)));
+ namespaceId = get_namespace_oid(newRelation->schemaname, false);
/* we do not check for USAGE rights here! */
}
+ else if (newRelation->relpersistence == RELPERSISTENCE_TEMP)
+ {
+ /* Initialize temp namespace if first time through */
+ if (!OidIsValid(myTempNamespace))
+ InitTempTableNamespace();
+ return myTempNamespace;
+ }
else
{
/* use the default creation namespace */
return namespaceId;
}
+/*
+ * RangeVarGetAndCheckCreationNamespace
+ *
+ * This function returns the OID of the namespace in which a new relation
+ * with a given name should be created. If the user does not have CREATE
+ * permission on the target namespace, this function will instead signal
+ * an ERROR.
+ *
+ * If non-NULL, *existing_oid is set to the OID of any existing relation with
+ * the same name which already exists in that namespace, or to InvalidOid if
+ * no such relation exists.
+ *
+ * If lockmode != NoLock, the specified lock mode is acquired on the existing
+ * relation, if any, provided that the current user owns the target relation.
+ * However, if lockmode != NoLock and the user does not own the target
+ * relation, we throw an ERROR, as we must not try to lock relations the
+ * user does not have permissions on.
+ *
+ * As a side effect, this function acquires AccessShareLock on the target
+ * namespace. Without this, the namespace could be dropped before our
+ * transaction commits, leaving behind relations with relnamespace pointing
+ * to a no-longer-exstant namespace.
+ *
+ * As a further side-effect, if the select namespace is a temporary namespace,
+ * we mark the RangeVar as RELPERSISTENCE_TEMP.
+ */
+Oid
+RangeVarGetAndCheckCreationNamespace(RangeVar *relation,
+ LOCKMODE lockmode,
+ Oid *existing_relation_id)
+{
+ uint64 inval_count;
+ Oid relid;
+ Oid oldrelid = InvalidOid;
+ Oid nspid;
+ Oid oldnspid = InvalidOid;
+ bool retry = false;
+
+ /*
+ * We check the catalog name and then ignore it.
+ */
+ if (relation->catalogname)
+ {
+ if (strcmp(relation->catalogname, get_database_name(MyDatabaseId)) != 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cross-database references are not implemented: \"%s.%s.%s\"",
+ relation->catalogname, relation->schemaname,
+ relation->relname)));
+ }
+
+ /*
+ * As in RangeVarGetRelidExtended(), we guard against concurrent DDL
+ * operations by tracking whether any invalidation messages are processed
+ * while we're doing the name lookups and acquiring locks. See comments
+ * in that function for a more detailed explanation of this logic.
+ */
+ for (;;)
+ {
+ AclResult aclresult;
+
+ inval_count = SharedInvalidMessageCounter;
+
+ /* Look up creation namespace and check for existing relation. */
+ nspid = RangeVarGetCreationNamespace(relation);
+ Assert(OidIsValid(nspid));
+ if (existing_relation_id != NULL)
+ relid = get_relname_relid(relation->relname, nspid);
+ else
+ relid = InvalidOid;
+
+ /*
+ * In bootstrap processing mode, we don't bother with permissions or
+ * locking. Permissions might not be working yet, and locking is
+ * unnecessary.
+ */
+ if (IsBootstrapProcessingMode())
+ break;
+
+ /* Check namespace permissions. */
+ aclresult = pg_namespace_aclcheck(nspid, GetUserId(), ACL_CREATE);
+ if (aclresult != ACLCHECK_OK)
+ aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
+ get_namespace_name(nspid));
+
+ if (retry)
+ {
+ /* If nothing changed, we're done. */
+ if (relid == oldrelid && nspid == oldnspid)
+ break;
+ /* If creation namespace has changed, give up old lock. */
+ if (nspid != oldnspid)
+ UnlockDatabaseObject(NamespaceRelationId, oldnspid, 0,
+ AccessShareLock);
+ /* If name points to something different, give up old lock. */
+ if (relid != oldrelid && OidIsValid(oldrelid) && lockmode != NoLock)
+ UnlockRelationOid(oldrelid, lockmode);
+ }
+
+ /* Lock namespace. */
+ if (nspid != oldnspid)
+ LockDatabaseObject(NamespaceRelationId, nspid, 0, AccessShareLock);
+
+ /* Lock relation, if required if and we have permission. */
+ if (lockmode != NoLock && OidIsValid(relid))
+ {
+ if (!pg_class_ownercheck(relid, GetUserId()))
+ aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
+ relation->relname);
+ if (relid != oldrelid)
+ LockRelationOid(relid, lockmode);
+ }
+
+ /* If no invalidation message were processed, we're done! */
+ if (inval_count == SharedInvalidMessageCounter)
+ break;
+
+ /* Something may have changed, so recheck our work. */
+ retry = true;
+ oldrelid = relid;
+ oldnspid = nspid;
+ }
+
+ RangeVarAdjustRelationPersistence(relation, nspid);
+ if (existing_relation_id != NULL)
+ *existing_relation_id = relid;
+ return nspid;
+}
+
+/*
+ * Adjust the relpersistence for an about-to-be-created relation based on the
+ * creation namespace, and throw an error for invalid combinations.
+ */
+void
+RangeVarAdjustRelationPersistence(RangeVar *newRelation, Oid nspid)
+{
+ switch (newRelation->relpersistence)
+ {
+ case RELPERSISTENCE_TEMP:
+ if (!isTempOrTempToastNamespace(nspid))
+ {
+ if (isAnyTempNamespace(nspid))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+ errmsg("cannot create relations in temporary schemas of other sessions")));
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+ errmsg("cannot create temporary relation in non-temporary schema")));
+ }
+ break;
+ case RELPERSISTENCE_PERMANENT:
+ if (isTempOrTempToastNamespace(nspid))
+ newRelation->relpersistence = RELPERSISTENCE_TEMP;
+ else if (isAnyTempNamespace(nspid))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+ errmsg("cannot create relations in temporary schemas of other sessions")));
+ break;
+ default:
+ if (isAnyTempNamespace(nspid))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+ errmsg("only temporary relations may be created in temporary schemas")));
+ }
+}
+
/*
* RelnameGetRelid
* Try to resolve an unqualified relation name.
Oid relnamespace;
bool visible;
- reltup = SearchSysCache(RELOID,
- ObjectIdGetDatum(relid),
- 0, 0, 0);
+ reltup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(reltup))
elog(ERROR, "cache lookup failed for relation %u", relid);
relform = (Form_pg_class) GETSTRUCT(reltup);
{
Oid namespaceId = lfirst_oid(l);
- typid = GetSysCacheOid(TYPENAMENSP,
- PointerGetDatum(typname),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ typid = GetSysCacheOid2(TYPENAMENSP,
+ PointerGetDatum(typname),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(typid))
return typid;
}
Oid typnamespace;
bool visible;
- typtup = SearchSysCache(TYPEOID,
- ObjectIdGetDatum(typid),
- 0, 0, 0);
+ typtup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
if (!HeapTupleIsValid(typtup))
elog(ERROR, "cache lookup failed for type %u", typid);
typform = (Form_pg_type) GETSTRUCT(typtup);
visible = true;
break;
}
- if (SearchSysCacheExists(TYPENAMENSP,
- PointerGetDatum(typname),
- ObjectIdGetDatum(namespaceId),
- 0, 0))
+ if (SearchSysCacheExists2(TYPENAMENSP,
+ PointerGetDatum(typname),
+ ObjectIdGetDatum(namespaceId)))
{
/* Found something else first in path */
break;
* retrieve a list of the possible matches.
*
* If nargs is -1, we return all functions matching the given name,
- * regardless of argument count. (expand_variadic and expand_defaults must be
- * false in this case.)
+ * regardless of argument count. (argnames must be NIL, and expand_variadic
+ * and expand_defaults must be false, in this case.)
+ *
+ * If argnames isn't NIL, we are considering a named- or mixed-notation call,
+ * and only functions having all the listed argument names will be returned.
+ * (We assume that length(argnames) <= nargs and all the passed-in names are
+ * distinct.) The returned structs will include an argnumbers array showing
+ * the actual argument index for each logical argument position.
*
* If expand_variadic is true, then variadic functions having the same number
* or fewer arguments will be retrieved, with the variadic argument and any
* than nargs arguments while the variadic transformation requires the same
* number or less.
*
+ * When argnames isn't NIL, the returned args[] type arrays are not ordered
+ * according to the functions' declarations, but rather according to the call:
+ * first any positional arguments, then the named arguments, then defaulted
+ * arguments (if needed and allowed by expand_defaults). The argnumbers[]
+ * array can be used to map this back to the catalog information.
+ * argnumbers[k] is set to the proargtypes index of the k'th call argument.
+ *
* We search a single namespace if the function name is qualified, else
* all namespaces in the search path. In the multiple-namespace case,
* we arrange for entries in earlier namespaces to mask identical entries in
* It is guaranteed that the return list will never contain multiple entries
* with identical argument lists. When expand_defaults is true, the entries
* could have more than nargs positions, but we still guarantee that they are
- * distinct in the first nargs positions. However, if either expand_variadic
- * or expand_defaults is true, there might be multiple candidate functions
- * that expand to identical argument lists. Rather than throw error here,
- * we report such situations by setting oid = 0 in the ambiguous entries.
+ * distinct in the first nargs positions. However, if argnames isn't NIL or
+ * either expand_variadic or expand_defaults is true, there might be multiple
+ * candidate functions that expand to identical argument lists. Rather than
+ * throw error here, we report such situations by returning a single entry
+ * with oid = 0 that represents a set of such conflicting candidates.
* The caller might end up discarding such an entry anyway, but if it selects
* such an entry it should react as though the call were ambiguous.
+ *
+ * If missing_ok is true, an empty list (NULL) is returned if the name was
+ * schema- qualified with a schema that does not exist. Likewise if no
+ * candidate is found for other reasons.
*/
FuncCandidateList
-FuncnameGetCandidates(List *names, int nargs,
- bool expand_variadic, bool expand_defaults)
+FuncnameGetCandidates(List *names, int nargs, List *argnames,
+ bool expand_variadic, bool expand_defaults,
+ bool missing_ok)
{
FuncCandidateList resultList = NULL;
bool any_special = false;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (!OidIsValid(namespaceId))
+ return NULL;
}
else
{
}
/* Search syscache by name only */
- catlist = SearchSysCacheList(PROCNAMEARGSNSP, 1,
- CStringGetDatum(funcname),
- 0, 0, 0);
+ catlist = SearchSysCacheList1(PROCNAMEARGSNSP, CStringGetDatum(funcname));
for (i = 0; i < catlist->n_members; i++)
{
bool variadic;
bool use_defaults;
Oid va_elem_type;
+ int *argnumbers = NULL;
FuncCandidateList newResult;
- /*
- * Check if function is variadic, and get variadic element type if so.
- * If expand_variadic is false, we should just ignore variadic-ness.
- */
- if (pronargs <= nargs && expand_variadic)
- {
- va_elem_type = procform->provariadic;
- variadic = OidIsValid(va_elem_type);
- any_special |= variadic;
- }
- else
- {
- va_elem_type = InvalidOid;
- variadic = false;
- }
-
- /*
- * Check if function can match by using parameter defaults.
- */
- if (pronargs > nargs && expand_defaults)
- {
- /* Ignore if not enough default expressions */
- if (nargs + procform->pronargdefaults < pronargs)
- continue;
- use_defaults = true;
- any_special = true;
- }
- else
- use_defaults = false;
-
- /* Ignore if it doesn't match requested argument count */
- if (nargs >= 0 && pronargs != nargs && !variadic && !use_defaults)
- continue;
-
if (OidIsValid(namespaceId))
{
/* Consider only procs in specified namespace */
continue; /* proc is not in search path */
}
+ if (argnames != NIL)
+ {
+ /*
+ * Call uses named or mixed notation
+ *
+ * Named or mixed notation can match a variadic function only if
+ * expand_variadic is off; otherwise there is no way to match the
+ * presumed-nameless parameters expanded from the variadic array.
+ */
+ if (OidIsValid(procform->provariadic) && expand_variadic)
+ continue;
+ va_elem_type = InvalidOid;
+ variadic = false;
+
+ /*
+ * Check argument count.
+ */
+ Assert(nargs >= 0); /* -1 not supported with argnames */
+
+ if (pronargs > nargs && expand_defaults)
+ {
+ /* Ignore if not enough default expressions */
+ if (nargs + procform->pronargdefaults < pronargs)
+ continue;
+ use_defaults = true;
+ }
+ else
+ use_defaults = false;
+
+ /* Ignore if it doesn't match requested argument count */
+ if (pronargs != nargs && !use_defaults)
+ continue;
+
+ /* Check for argument name match, generate positional mapping */
+ if (!MatchNamedCall(proctup, nargs, argnames,
+ &argnumbers))
+ continue;
+
+ /* Named argument matching is always "special" */
+ any_special = true;
+ }
+ else
+ {
+ /*
+ * Call uses positional notation
+ *
+ * Check if function is variadic, and get variadic element type if
+ * so. If expand_variadic is false, we should just ignore
+ * variadic-ness.
+ */
+ if (pronargs <= nargs && expand_variadic)
+ {
+ va_elem_type = procform->provariadic;
+ variadic = OidIsValid(va_elem_type);
+ any_special |= variadic;
+ }
+ else
+ {
+ va_elem_type = InvalidOid;
+ variadic = false;
+ }
+
+ /*
+ * Check if function can match by using parameter defaults.
+ */
+ if (pronargs > nargs && expand_defaults)
+ {
+ /* Ignore if not enough default expressions */
+ if (nargs + procform->pronargdefaults < pronargs)
+ continue;
+ use_defaults = true;
+ any_special = true;
+ }
+ else
+ use_defaults = false;
+
+ /* Ignore if it doesn't match requested argument count */
+ if (nargs >= 0 && pronargs != nargs && !variadic && !use_defaults)
+ continue;
+ }
+
/*
* We must compute the effective argument list so that we can easily
* compare it to earlier results. We waste a palloc cycle if it gets
*/
effective_nargs = Max(pronargs, nargs);
newResult = (FuncCandidateList)
- palloc(sizeof(struct _FuncCandidateList) - sizeof(Oid)
- + effective_nargs * sizeof(Oid));
+ palloc(offsetof(struct _FuncCandidateList, args) +
+ effective_nargs * sizeof(Oid));
newResult->pathpos = pathpos;
newResult->oid = HeapTupleGetOid(proctup);
newResult->nargs = effective_nargs;
- memcpy(newResult->args, procform->proargtypes.values,
- pronargs * sizeof(Oid));
+ newResult->argnumbers = argnumbers;
+ if (argnumbers)
+ {
+ /* Re-order the argument types into call's logical order */
+ Oid *proargtypes = procform->proargtypes.values;
+ int i;
+
+ for (i = 0; i < pronargs; i++)
+ newResult->args[i] = proargtypes[argnumbers[i]];
+ }
+ else
+ {
+ /* Simple positional case, just copy proargtypes as-is */
+ memcpy(newResult->args, procform->proargtypes.values,
+ pronargs * sizeof(Oid));
+ }
if (variadic)
{
- int i;
+ int i;
newResult->nvargs = effective_nargs - pronargs + 1;
/* Expand variadic argument into N copies of element type */
* Does it have the same arguments as something we already accepted?
* If so, decide what to do to avoid returning duplicate argument
* lists. We can skip this check for the single-namespace case if no
- * special (variadic or defaults) match has been made, since then the
- * unique index on pg_proc guarantees all the matches have different
- * argument lists.
+ * special (named, variadic or defaults) match has been made, since
+ * then the unique index on pg_proc guarantees all the matches have
+ * different argument lists.
*/
if (resultList != NULL &&
(any_special || !OidIsValid(namespaceId)))
}
else
{
- int cmp_nargs = newResult->nargs - newResult->ndargs;
+ int cmp_nargs = newResult->nargs - newResult->ndargs;
for (prevResult = resultList;
prevResult;
* preference < 0 means prefer the new, preference = 0 means
* ambiguous.
*/
- int preference;
+ int preference;
if (pathpos != prevResult->pathpos)
{
{
/*
* With variadic functions we could have, for example,
- * both foo(numeric) and foo(variadic numeric[]) in
- * the same namespace; if so we prefer the
- * non-variadic match on efficiency grounds.
+ * both foo(numeric) and foo(variadic numeric[]) in the
+ * same namespace; if so we prefer the non-variadic match
+ * on efficiency grounds.
*/
preference = 1;
}
* both foo(numeric, variadic numeric[]) and
* foo(variadic numeric[]) in the same namespace, or
* both foo(int) and foo (int, int default something)
- * in the same namespace.
+ * in the same namespace, or both foo(a int, b text)
+ * and foo(b text, a int) in the same namespace.
*----------
*/
preference = 0;
break;
}
}
- Assert(prevPrevResult); /* assert we found it */
+ Assert(prevPrevResult); /* assert we found it */
}
pfree(prevResult);
/* fall through to add newResult to list */
return resultList;
}
+/*
+ * MatchNamedCall
+ * Given a pg_proc heap tuple and a call's list of argument names,
+ * check whether the function could match the call.
+ *
+ * The call could match if all supplied argument names are accepted by
+ * the function, in positions after the last positional argument, and there
+ * are defaults for all unsupplied arguments.
+ *
+ * The number of positional arguments is nargs - list_length(argnames).
+ * Note caller has already done basic checks on argument count.
+ *
+ * On match, return true and fill *argnumbers with a palloc'd array showing
+ * the mapping from call argument positions to actual function argument
+ * numbers. Defaulted arguments are included in this map, at positions
+ * after the last supplied argument.
+ */
+static bool
+MatchNamedCall(HeapTuple proctup, int nargs, List *argnames,
+ int **argnumbers)
+{
+ Form_pg_proc procform = (Form_pg_proc) GETSTRUCT(proctup);
+ int pronargs = procform->pronargs;
+ int numposargs = nargs - list_length(argnames);
+ int pronallargs;
+ Oid *p_argtypes;
+ char **p_argnames;
+ char *p_argmodes;
+ bool arggiven[FUNC_MAX_ARGS];
+ bool isnull;
+ int ap; /* call args position */
+ int pp; /* proargs position */
+ ListCell *lc;
+
+ Assert(argnames != NIL);
+ Assert(numposargs >= 0);
+ Assert(nargs <= pronargs);
+
+ /* Ignore this function if its proargnames is null */
+ (void) SysCacheGetAttr(PROCOID, proctup, Anum_pg_proc_proargnames,
+ &isnull);
+ if (isnull)
+ return false;
+
+ /* OK, let's extract the argument names and types */
+ pronallargs = get_func_arg_info(proctup,
+ &p_argtypes, &p_argnames, &p_argmodes);
+ Assert(p_argnames != NULL);
+
+ /* initialize state for matching */
+ *argnumbers = (int *) palloc(pronargs * sizeof(int));
+ memset(arggiven, false, pronargs * sizeof(bool));
+
+ /* there are numposargs positional args before the named args */
+ for (ap = 0; ap < numposargs; ap++)
+ {
+ (*argnumbers)[ap] = ap;
+ arggiven[ap] = true;
+ }
+
+ /* now examine the named args */
+ foreach(lc, argnames)
+ {
+ char *argname = (char *) lfirst(lc);
+ bool found;
+ int i;
+
+ pp = 0;
+ found = false;
+ for (i = 0; i < pronallargs; i++)
+ {
+ /* consider only input parameters */
+ if (p_argmodes &&
+ (p_argmodes[i] != FUNC_PARAM_IN &&
+ p_argmodes[i] != FUNC_PARAM_INOUT &&
+ p_argmodes[i] != FUNC_PARAM_VARIADIC))
+ continue;
+ if (p_argnames[i] && strcmp(p_argnames[i], argname) == 0)
+ {
+ /* fail if argname matches a positional argument */
+ if (arggiven[pp])
+ return false;
+ arggiven[pp] = true;
+ (*argnumbers)[ap] = pp;
+ found = true;
+ break;
+ }
+ /* increase pp only for input parameters */
+ pp++;
+ }
+ /* if name isn't in proargnames, fail */
+ if (!found)
+ return false;
+ ap++;
+ }
+
+ Assert(ap == nargs); /* processed all actual parameters */
+
+ /* Check for default arguments */
+ if (nargs < pronargs)
+ {
+ int first_arg_with_default = pronargs - procform->pronargdefaults;
+
+ for (pp = numposargs; pp < pronargs; pp++)
+ {
+ if (arggiven[pp])
+ continue;
+ /* fail if arg not given and no default available */
+ if (pp < first_arg_with_default)
+ return false;
+ (*argnumbers)[ap++] = pp;
+ }
+ }
+
+ Assert(ap == pronargs); /* processed all function parameters */
+
+ return true;
+}
+
/*
* FunctionIsVisible
* Determine whether a function (identified by OID) is visible in the
Oid pronamespace;
bool visible;
- proctup = SearchSysCache(PROCOID,
- ObjectIdGetDatum(funcid),
- 0, 0, 0);
+ proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(proctup))
elog(ERROR, "cache lookup failed for function %u", funcid);
procform = (Form_pg_proc) GETSTRUCT(proctup);
visible = false;
clist = FuncnameGetCandidates(list_make1(makeString(proname)),
- nargs, false, false);
+ nargs, NIL, false, false, false);
for (; clist; clist = clist->next)
{
* a postfix op.
*
* If the operator name is not schema-qualified, it is sought in the current
- * namespace search path.
+ * namespace search path. If the name is schema-qualified and the given
+ * schema does not exist, InvalidOid is returned.
*/
Oid
OpernameGetOprid(List *names, Oid oprleft, Oid oprright)
{
/* search only in exact schema given */
Oid namespaceId;
- HeapTuple opertup;
- namespaceId = LookupExplicitNamespace(schemaname);
- opertup = SearchSysCache(OPERNAMENSP,
- CStringGetDatum(opername),
- ObjectIdGetDatum(oprleft),
- ObjectIdGetDatum(oprright),
- ObjectIdGetDatum(namespaceId));
- if (HeapTupleIsValid(opertup))
+ namespaceId = LookupExplicitNamespace(schemaname, true);
+ if (OidIsValid(namespaceId))
{
- Oid result = HeapTupleGetOid(opertup);
+ HeapTuple opertup;
+
+ opertup = SearchSysCache4(OPERNAMENSP,
+ CStringGetDatum(opername),
+ ObjectIdGetDatum(oprleft),
+ ObjectIdGetDatum(oprright),
+ ObjectIdGetDatum(namespaceId));
+ if (HeapTupleIsValid(opertup))
+ {
+ Oid result = HeapTupleGetOid(opertup);
- ReleaseSysCache(opertup);
- return result;
+ ReleaseSysCache(opertup);
+ return result;
+ }
}
+
return InvalidOid;
}
/* Search syscache by name and argument types */
- catlist = SearchSysCacheList(OPERNAMENSP, 3,
- CStringGetDatum(opername),
- ObjectIdGetDatum(oprleft),
- ObjectIdGetDatum(oprright),
- 0);
+ catlist = SearchSysCacheList3(OPERNAMENSP,
+ CStringGetDatum(opername),
+ ObjectIdGetDatum(oprleft),
+ ObjectIdGetDatum(oprright));
if (catlist->n_members == 0)
{
* identical entries in later namespaces.
*
* The returned items always have two args[] entries --- one or the other
- * will be InvalidOid for a prefix or postfix oprkind. nargs is 2, too.
+ * will be InvalidOid for a prefix or postfix oprkind. nargs is 2, too.
*/
FuncCandidateList
-OpernameGetCandidates(List *names, char oprkind)
+OpernameGetCandidates(List *names, char oprkind, bool missing_schema_ok)
{
FuncCandidateList resultList = NULL;
char *resultSpace = NULL;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_schema_ok);
+ if (missing_schema_ok && !OidIsValid(namespaceId))
+ return NULL;
}
else
{
}
/* Search syscache by name only */
- catlist = SearchSysCacheList(OPERNAMENSP, 1,
- CStringGetDatum(opername),
- 0, 0, 0);
+ catlist = SearchSysCacheList1(OPERNAMENSP, CStringGetDatum(opername));
/*
* In typical scenarios, most if not all of the operators found by the
* separate palloc for each operator, but profiling revealed that the
* pallocs used an unreasonably large fraction of parsing time.
*/
-#define SPACE_PER_OP MAXALIGN(sizeof(struct _FuncCandidateList) + sizeof(Oid))
+#define SPACE_PER_OP MAXALIGN(offsetof(struct _FuncCandidateList, args) + \
+ 2 * sizeof(Oid))
if (catlist->n_members > 0)
resultSpace = palloc(catlist->n_members * SPACE_PER_OP);
newResult->nargs = 2;
newResult->nvargs = 0;
newResult->ndargs = 0;
+ newResult->argnumbers = NULL;
newResult->args[0] = operform->oprleft;
newResult->args[1] = operform->oprright;
newResult->next = resultList;
Oid oprnamespace;
bool visible;
- oprtup = SearchSysCache(OPEROID,
- ObjectIdGetDatum(oprid),
- 0, 0, 0);
+ oprtup = SearchSysCache1(OPEROID, ObjectIdGetDatum(oprid));
if (!HeapTupleIsValid(oprtup))
elog(ERROR, "cache lookup failed for operator %u", oprid);
oprform = (Form_pg_operator) GETSTRUCT(oprtup);
* If it is in the path, it might still not be visible; it could be
* hidden by another operator of the same name and arguments earlier
* in the path. So we must do a slow check to see if this is the same
- * operator that would be found by OpernameGetOprId.
+ * operator that would be found by OpernameGetOprid.
*/
char *oprname = NameStr(oprform->oprname);
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- opcid = GetSysCacheOid(CLAAMNAMENSP,
- ObjectIdGetDatum(amid),
- PointerGetDatum(opcname),
- ObjectIdGetDatum(namespaceId),
- 0);
+ opcid = GetSysCacheOid3(CLAAMNAMENSP,
+ ObjectIdGetDatum(amid),
+ PointerGetDatum(opcname),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(opcid))
return opcid;
}
Oid opcnamespace;
bool visible;
- opctup = SearchSysCache(CLAOID,
- ObjectIdGetDatum(opcid),
- 0, 0, 0);
+ opctup = SearchSysCache1(CLAOID, ObjectIdGetDatum(opcid));
if (!HeapTupleIsValid(opctup))
elog(ERROR, "cache lookup failed for opclass %u", opcid);
opcform = (Form_pg_opclass) GETSTRUCT(opctup);
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- opfid = GetSysCacheOid(OPFAMILYAMNAMENSP,
- ObjectIdGetDatum(amid),
- PointerGetDatum(opfname),
- ObjectIdGetDatum(namespaceId),
- 0);
+ opfid = GetSysCacheOid3(OPFAMILYAMNAMENSP,
+ ObjectIdGetDatum(amid),
+ PointerGetDatum(opfname),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(opfid))
return opfid;
}
Oid opfnamespace;
bool visible;
- opftup = SearchSysCache(OPFAMILYOID,
- ObjectIdGetDatum(opfid),
- 0, 0, 0);
+ opftup = SearchSysCache1(OPFAMILYOID, ObjectIdGetDatum(opfid));
if (!HeapTupleIsValid(opftup))
elog(ERROR, "cache lookup failed for opfamily %u", opfid);
opfform = (Form_pg_opfamily) GETSTRUCT(opftup);
return visible;
}
+/*
+ * CollationGetCollid
+ * Try to resolve an unqualified collation name.
+ * Returns OID if collation found in search path, else InvalidOid.
+ */
+Oid
+CollationGetCollid(const char *collname)
+{
+ int32 dbencoding = GetDatabaseEncoding();
+ ListCell *l;
+
+ recomputeNamespacePath();
+
+ foreach(l, activeSearchPath)
+ {
+ Oid namespaceId = lfirst_oid(l);
+ Oid collid;
+
+ if (namespaceId == myTempNamespace)
+ continue; /* do not look in temp namespace */
+
+ /* Check for database-encoding-specific entry */
+ collid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collname),
+ Int32GetDatum(dbencoding),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(collid))
+ return collid;
+
+ /* Check for any-encoding entry */
+ collid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collname),
+ Int32GetDatum(-1),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(collid))
+ return collid;
+ }
+
+ /* Not found in path */
+ return InvalidOid;
+}
+
+/*
+ * CollationIsVisible
+ * Determine whether a collation (identified by OID) is visible in the
+ * current search path. Visible means "would be found by searching
+ * for the unqualified collation name".
+ */
+bool
+CollationIsVisible(Oid collid)
+{
+ HeapTuple colltup;
+ Form_pg_collation collform;
+ Oid collnamespace;
+ bool visible;
+
+ colltup = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
+ if (!HeapTupleIsValid(colltup))
+ elog(ERROR, "cache lookup failed for collation %u", collid);
+ collform = (Form_pg_collation) GETSTRUCT(colltup);
+
+ recomputeNamespacePath();
+
+ /*
+ * Quick check: if it ain't in the path at all, it ain't visible. Items in
+ * the system namespace are surely in the path and so we needn't even do
+ * list_member_oid() for them.
+ */
+ collnamespace = collform->collnamespace;
+ if (collnamespace != PG_CATALOG_NAMESPACE &&
+ !list_member_oid(activeSearchPath, collnamespace))
+ visible = false;
+ else
+ {
+ /*
+ * If it is in the path, it might still not be visible; it could be
+ * hidden by another conversion of the same name earlier in the path.
+ * So we must do a slow check to see if this conversion would be found
+ * by CollationGetCollid.
+ */
+ char *collname = NameStr(collform->collname);
+
+ visible = (CollationGetCollid(collname) == collid);
+ }
+
+ ReleaseSysCache(colltup);
+
+ return visible;
+}
+
+
/*
* ConversionGetConid
* Try to resolve an unqualified conversion name.
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- conid = GetSysCacheOid(CONNAMENSP,
- PointerGetDatum(conname),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ conid = GetSysCacheOid2(CONNAMENSP,
+ PointerGetDatum(conname),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(conid))
return conid;
}
Oid connamespace;
bool visible;
- contup = SearchSysCache(CONVOID,
- ObjectIdGetDatum(conid),
- 0, 0, 0);
+ contup = SearchSysCache1(CONVOID, ObjectIdGetDatum(conid));
if (!HeapTupleIsValid(contup))
elog(ERROR, "cache lookup failed for conversion %u", conid);
conform = (Form_pg_conversion) GETSTRUCT(contup);
}
/*
- * TSParserGetPrsid - find a TS parser by possibly qualified name
+ * get_ts_parser_oid - find a TS parser by possibly qualified name
*
- * If not found, returns InvalidOid if failOK, else throws error
+ * If not found, returns InvalidOid if missing_ok, else throws error
*/
Oid
-TSParserGetPrsid(List *names, bool failOK)
+get_ts_parser_oid(List *names, bool missing_ok)
{
char *schemaname;
char *parser_name;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
- prsoid = GetSysCacheOid(TSPARSERNAMENSP,
- PointerGetDatum(parser_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ prsoid = InvalidOid;
+ else
+ prsoid = GetSysCacheOid2(TSPARSERNAMENSP,
+ PointerGetDatum(parser_name),
+ ObjectIdGetDatum(namespaceId));
}
else
{
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- prsoid = GetSysCacheOid(TSPARSERNAMENSP,
- PointerGetDatum(parser_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ prsoid = GetSysCacheOid2(TSPARSERNAMENSP,
+ PointerGetDatum(parser_name),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(prsoid))
break;
}
}
- if (!OidIsValid(prsoid) && !failOK)
+ if (!OidIsValid(prsoid) && !missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("text search parser \"%s\" does not exist",
Oid namespace;
bool visible;
- tup = SearchSysCache(TSPARSEROID,
- ObjectIdGetDatum(prsId),
- 0, 0, 0);
+ tup = SearchSysCache1(TSPARSEROID, ObjectIdGetDatum(prsId));
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for text search parser %u", prsId);
form = (Form_pg_ts_parser) GETSTRUCT(tup);
visible = true;
break;
}
- if (SearchSysCacheExists(TSPARSERNAMENSP,
- PointerGetDatum(name),
- ObjectIdGetDatum(namespaceId),
- 0, 0))
+ if (SearchSysCacheExists2(TSPARSERNAMENSP,
+ PointerGetDatum(name),
+ ObjectIdGetDatum(namespaceId)))
{
/* Found something else first in path */
break;
}
/*
- * TSDictionaryGetDictid - find a TS dictionary by possibly qualified name
+ * get_ts_dict_oid - find a TS dictionary by possibly qualified name
*
* If not found, returns InvalidOid if failOK, else throws error
*/
Oid
-TSDictionaryGetDictid(List *names, bool failOK)
+get_ts_dict_oid(List *names, bool missing_ok)
{
char *schemaname;
char *dict_name;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
- dictoid = GetSysCacheOid(TSDICTNAMENSP,
- PointerGetDatum(dict_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ dictoid = InvalidOid;
+ else
+ dictoid = GetSysCacheOid2(TSDICTNAMENSP,
+ PointerGetDatum(dict_name),
+ ObjectIdGetDatum(namespaceId));
}
else
{
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- dictoid = GetSysCacheOid(TSDICTNAMENSP,
- PointerGetDatum(dict_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ dictoid = GetSysCacheOid2(TSDICTNAMENSP,
+ PointerGetDatum(dict_name),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(dictoid))
break;
}
}
- if (!OidIsValid(dictoid) && !failOK)
+ if (!OidIsValid(dictoid) && !missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("text search dictionary \"%s\" does not exist",
Oid namespace;
bool visible;
- tup = SearchSysCache(TSDICTOID,
- ObjectIdGetDatum(dictId),
- 0, 0, 0);
+ tup = SearchSysCache1(TSDICTOID, ObjectIdGetDatum(dictId));
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for text search dictionary %u",
dictId);
visible = true;
break;
}
- if (SearchSysCacheExists(TSDICTNAMENSP,
- PointerGetDatum(name),
- ObjectIdGetDatum(namespaceId),
- 0, 0))
+ if (SearchSysCacheExists2(TSDICTNAMENSP,
+ PointerGetDatum(name),
+ ObjectIdGetDatum(namespaceId)))
{
/* Found something else first in path */
break;
}
/*
- * TSTemplateGetTmplid - find a TS template by possibly qualified name
+ * get_ts_template_oid - find a TS template by possibly qualified name
*
- * If not found, returns InvalidOid if failOK, else throws error
+ * If not found, returns InvalidOid if missing_ok, else throws error
*/
Oid
-TSTemplateGetTmplid(List *names, bool failOK)
+get_ts_template_oid(List *names, bool missing_ok)
{
char *schemaname;
char *template_name;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
- tmploid = GetSysCacheOid(TSTEMPLATENAMENSP,
- PointerGetDatum(template_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ tmploid = InvalidOid;
+ else
+ tmploid = GetSysCacheOid2(TSTEMPLATENAMENSP,
+ PointerGetDatum(template_name),
+ ObjectIdGetDatum(namespaceId));
}
else
{
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- tmploid = GetSysCacheOid(TSTEMPLATENAMENSP,
- PointerGetDatum(template_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ tmploid = GetSysCacheOid2(TSTEMPLATENAMENSP,
+ PointerGetDatum(template_name),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(tmploid))
break;
}
}
- if (!OidIsValid(tmploid) && !failOK)
+ if (!OidIsValid(tmploid) && !missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("text search template \"%s\" does not exist",
Oid namespace;
bool visible;
- tup = SearchSysCache(TSTEMPLATEOID,
- ObjectIdGetDatum(tmplId),
- 0, 0, 0);
+ tup = SearchSysCache1(TSTEMPLATEOID, ObjectIdGetDatum(tmplId));
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for text search template %u", tmplId);
form = (Form_pg_ts_template) GETSTRUCT(tup);
visible = true;
break;
}
- if (SearchSysCacheExists(TSTEMPLATENAMENSP,
- PointerGetDatum(name),
- ObjectIdGetDatum(namespaceId),
- 0, 0))
+ if (SearchSysCacheExists2(TSTEMPLATENAMENSP,
+ PointerGetDatum(name),
+ ObjectIdGetDatum(namespaceId)))
{
/* Found something else first in path */
break;
}
/*
- * TSConfigGetCfgid - find a TS config by possibly qualified name
+ * get_ts_config_oid - find a TS config by possibly qualified name
*
- * If not found, returns InvalidOid if failOK, else throws error
+ * If not found, returns InvalidOid if missing_ok, else throws error
*/
Oid
-TSConfigGetCfgid(List *names, bool failOK)
+get_ts_config_oid(List *names, bool missing_ok)
{
char *schemaname;
char *config_name;
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
- cfgoid = GetSysCacheOid(TSCONFIGNAMENSP,
- PointerGetDatum(config_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ cfgoid = InvalidOid;
+ else
+ cfgoid = GetSysCacheOid2(TSCONFIGNAMENSP,
+ PointerGetDatum(config_name),
+ ObjectIdGetDatum(namespaceId));
}
else
{
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- cfgoid = GetSysCacheOid(TSCONFIGNAMENSP,
- PointerGetDatum(config_name),
- ObjectIdGetDatum(namespaceId),
- 0, 0);
+ cfgoid = GetSysCacheOid2(TSCONFIGNAMENSP,
+ PointerGetDatum(config_name),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(cfgoid))
break;
}
}
- if (!OidIsValid(cfgoid) && !failOK)
+ if (!OidIsValid(cfgoid) && !missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("text search configuration \"%s\" does not exist",
/*
* TSConfigIsVisible
* Determine whether a text search configuration (identified by OID)
- * is visible in the current search path. Visible means "would be found
+ * is visible in the current search path. Visible means "would be found
* by searching for the unqualified text search configuration name".
*/
bool
Oid namespace;
bool visible;
- tup = SearchSysCache(TSCONFIGOID,
- ObjectIdGetDatum(cfgid),
- 0, 0, 0);
+ tup = SearchSysCache1(TSCONFIGOID, ObjectIdGetDatum(cfgid));
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for text search configuration %u",
cfgid);
visible = true;
break;
}
- if (SearchSysCacheExists(TSCONFIGNAMENSP,
- PointerGetDatum(name),
- ObjectIdGetDatum(namespaceId),
- 0, 0))
+ if (SearchSysCacheExists2(TSCONFIGNAMENSP,
+ PointerGetDatum(name),
+ ObjectIdGetDatum(namespaceId)))
{
/* Found something else first in path */
break;
*objname_p = objname;
}
+/*
+ * LookupNamespaceNoError
+ * Look up a schema name.
+ *
+ * Returns the namespace OID, or InvalidOid if not found.
+ *
+ * Note this does NOT perform any permissions check --- callers are
+ * responsible for being sure that an appropriate check is made.
+ * In the majority of cases LookupExplicitNamespace is preferable.
+ */
+Oid
+LookupNamespaceNoError(const char *nspname)
+{
+ /* check for pg_temp alias */
+ if (strcmp(nspname, "pg_temp") == 0)
+ {
+ if (OidIsValid(myTempNamespace))
+ {
+ InvokeNamespaceSearchHook(myTempNamespace, true);
+ return myTempNamespace;
+ }
+
+ /*
+ * Since this is used only for looking up existing objects, there is
+ * no point in trying to initialize the temp namespace here; and doing
+ * so might create problems for some callers. Just report "not found".
+ */
+ return InvalidOid;
+ }
+
+ return get_namespace_oid(nspname, true);
+}
+
/*
* LookupExplicitNamespace
* Process an explicitly-specified schema name: look up the schema
* and verify we have USAGE (lookup) rights in it.
*
- * Returns the namespace OID. Raises ereport if any problem.
+ * Returns the namespace OID
*/
Oid
-LookupExplicitNamespace(const char *nspname)
+LookupExplicitNamespace(const char *nspname, bool missing_ok)
{
Oid namespaceId;
AclResult aclresult;
/*
* Since this is used only for looking up existing objects, there is
* no point in trying to initialize the temp namespace here; and doing
- * so might create problems for some callers. Just fall through and
- * give the "does not exist" error.
+ * so might create problems for some callers --- just fall through.
*/
}
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(nspname),
- 0, 0, 0);
- if (!OidIsValid(namespaceId))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_SCHEMA),
- errmsg("schema \"%s\" does not exist", nspname)));
+ namespaceId = get_namespace_oid(nspname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ return InvalidOid;
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
nspname);
+ /* Schema search hook for this lookup */
+ InvokeNamespaceSearchHook(namespaceId, true);
return namespaceId;
}
* LookupCreationNamespace
* Look up the schema and verify we have CREATE rights on it.
*
- * This is just like LookupExplicitNamespace except for the permission check,
- * and that we are willing to create pg_temp if needed.
+ * This is just like LookupExplicitNamespace except for the different
+ * permission check, and that we are willing to create pg_temp if needed.
*
* Note: calling this may result in a CommandCounterIncrement operation,
* if we have to create or clean out the temp namespace.
return myTempNamespace;
}
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(nspname),
- 0, 0, 0);
- if (!OidIsValid(namespaceId))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_SCHEMA),
- errmsg("schema \"%s\" does not exist", nspname)));
+ namespaceId = get_namespace_oid(nspname, false);
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
return namespaceId;
}
+/*
+ * Common checks on switching namespaces.
+ *
+ * We complain if either the old or new namespaces is a temporary schema
+ * (or temporary toast schema), or if either the old or new namespaces is the
+ * TOAST schema.
+ */
+void
+CheckSetNamespace(Oid oldNspOid, Oid nspOid)
+{
+ /* disallow renaming into or out of temp schemas */
+ if (isAnyTempNamespace(nspOid) || isAnyTempNamespace(oldNspOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cannot move objects into or out of temporary schemas")));
+
+ /* same for TOAST schema */
+ if (nspOid == PG_TOAST_NAMESPACE || oldNspOid == PG_TOAST_NAMESPACE)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cannot move objects into or out of TOAST schema")));
+}
+
/*
* QualifiedNameGetCreationNamespace
* Given a possibly-qualified name for an object (in List-of-Values
return myTempNamespace;
}
/* use exact schema given */
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(schemaname),
- 0, 0, 0);
- if (!OidIsValid(namespaceId))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_SCHEMA),
- errmsg("schema \"%s\" does not exist", schemaname)));
+ namespaceId = get_namespace_oid(schemaname, false);
/* we do not check for USAGE rights here! */
}
else
return namespaceId;
}
+/*
+ * get_namespace_oid - given a namespace name, look up the OID
+ *
+ * If missing_ok is false, throw an error if namespace name not found. If
+ * true, just return InvalidOid.
+ */
+Oid
+get_namespace_oid(const char *nspname, bool missing_ok)
+{
+ Oid oid;
+
+ oid = GetSysCacheOid1(NAMESPACENAME, CStringGetDatum(nspname));
+ if (!OidIsValid(oid) && !missing_ok)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_SCHEMA),
+ errmsg("schema \"%s\" does not exist", nspname)));
+
+ return oid;
+}
+
/*
* makeRangeVarFromNameList
* Utility routine to convert a qualified-name list into RangeVar form.
if (IsA(name, String))
appendStringInfoString(&string, strVal(name));
else if (IsA(name, A_Star))
- appendStringInfoString(&string, "*");
+ appendStringInfoChar(&string, '*');
else
elog(ERROR, "unexpected node type in name list: %d",
(int) nodeTag(name));
}
/*
- * isTempOrToastNamespace - is the given namespace my temporary-table
+ * isTempOrTempToastNamespace - is the given namespace my temporary-table
* namespace or my temporary-toast-table namespace?
*/
bool
-isTempOrToastNamespace(Oid namespaceId)
+isTempOrTempToastNamespace(Oid namespaceId)
{
if (OidIsValid(myTempNamespace) &&
(myTempNamespace == namespaceId || myTempToastNamespace == namespaceId))
/*
* isOtherTempNamespace - is the given namespace some other backend's
* temporary-table namespace (including temporary-toast-table namespaces)?
+ *
+ * Note: for most purposes in the C code, this function is obsolete. Use
+ * RELATION_IS_OTHER_TEMP() instead to detect non-local temp relations.
*/
bool
isOtherTempNamespace(Oid namespaceId)
{
/* If it's my own temp namespace, say "false" */
- if (isTempOrToastNamespace(namespaceId))
+ if (isTempOrTempToastNamespace(namespaceId))
return false;
/* Else, if it's any temp namespace, say "true" */
return isAnyTempNamespace(namespaceId);
* GetTempNamespaceBackendId - if the given namespace is a temporary-table
* namespace (either my own, or another backend's), return the BackendId
* that owns it. Temporary-toast-table namespaces are included, too.
- * If it isn't a temp namespace, return -1.
+ * If it isn't a temp namespace, return InvalidBackendId.
*/
int
GetTempNamespaceBackendId(Oid namespaceId)
/* See if the namespace name starts with "pg_temp_" or "pg_toast_temp_" */
nspname = get_namespace_name(namespaceId);
if (!nspname)
- return -1; /* no such namespace? */
+ return InvalidBackendId; /* no such namespace? */
if (strncmp(nspname, "pg_temp_", 8) == 0)
result = atoi(nspname + 8);
else if (strncmp(nspname, "pg_toast_temp_", 14) == 0)
result = atoi(nspname + 14);
else
- result = -1;
+ result = InvalidBackendId;
pfree(nspname);
return result;
}
/*
* GetTempToastNamespace - get the OID of my temporary-toast-table namespace,
- * which must already be assigned. (This is only used when creating a toast
+ * which must already be assigned. (This is only used when creating a toast
* table for a temp table, so we must have already done InitTempTableNamespace)
*/
Oid
return result;
}
+/*
+ * CopyOverrideSearchPath - copy the specified OverrideSearchPath.
+ *
+ * The result structure is allocated in CurrentMemoryContext.
+ */
+OverrideSearchPath *
+CopyOverrideSearchPath(OverrideSearchPath *path)
+{
+ OverrideSearchPath *result;
+
+ result = (OverrideSearchPath *) palloc(sizeof(OverrideSearchPath));
+ result->schemas = list_copy(path->schemas);
+ result->addCatalog = path->addCatalog;
+ result->addTemp = path->addTemp;
+
+ return result;
+}
+
+/*
+ * OverrideSearchPathMatchesCurrent - does path match current setting?
+ */
+bool
+OverrideSearchPathMatchesCurrent(OverrideSearchPath *path)
+{
+ ListCell *lc,
+ *lcp;
+
+ recomputeNamespacePath();
+
+ /* We scan down the activeSearchPath to see if it matches the input. */
+ lc = list_head(activeSearchPath);
+
+ /* If path->addTemp, first item should be my temp namespace. */
+ if (path->addTemp)
+ {
+ if (lc && lfirst_oid(lc) == myTempNamespace)
+ lc = lnext(lc);
+ else
+ return false;
+ }
+ /* If path->addCatalog, next item should be pg_catalog. */
+ if (path->addCatalog)
+ {
+ if (lc && lfirst_oid(lc) == PG_CATALOG_NAMESPACE)
+ lc = lnext(lc);
+ else
+ return false;
+ }
+ /* We should now be looking at the activeCreationNamespace. */
+ if (activeCreationNamespace != (lc ? lfirst_oid(lc) : InvalidOid))
+ return false;
+ /* The remainder of activeSearchPath should match path->schemas. */
+ foreach(lcp, path->schemas)
+ {
+ if (lc && lfirst_oid(lc) == lfirst_oid(lcp))
+ lc = lnext(lc);
+ else
+ return false;
+ }
+ if (lc)
+ return false;
+ return true;
+}
+
/*
* PushOverrideSearchPath - temporarily override the search path
*
* We allow nested overrides, hence the push/pop terminology. The GUC
* search_path variable is ignored while an override is active.
+ *
+ * It's possible that newpath->useTemp is set but there is no longer any
+ * active temp namespace, if the path was saved during a transaction that
+ * created a temp namespace and was later rolled back. In that case we just
+ * ignore useTemp. A plausible alternative would be to create a new temp
+ * namespace, but for existing callers that's not necessary because an empty
+ * temp namespace wouldn't affect their results anyway.
+ *
+ * It's also worth noting that other schemas listed in newpath might not
+ * exist anymore either. We don't worry about this because OIDs that match
+ * no existing namespace will simply not produce any hits during searches.
*/
void
PushOverrideSearchPath(OverrideSearchPath *newpath)
firstNS = linitial_oid(oidlist);
/*
- * Add any implicitly-searched namespaces to the list. Note these go on
+ * Add any implicitly-searched namespaces to the list. Note these go on
* the front, not the back; also notice that we do not check USAGE
* permissions for these.
*/
if (newpath->addCatalog)
oidlist = lcons_oid(PG_CATALOG_NAMESPACE, oidlist);
- if (newpath->addTemp)
- {
- Assert(OidIsValid(myTempNamespace));
+ if (newpath->addTemp && OidIsValid(myTempNamespace))
oidlist = lcons_oid(myTempNamespace, oidlist);
- }
/*
* Build the new stack entry, then insert it at the head of the list.
/*
- * FindConversionByName - find a conversion by possibly qualified name
+ * get_collation_oid - find a collation by possibly qualified name
*/
Oid
-FindConversionByName(List *name)
+get_collation_oid(List *name, bool missing_ok)
+{
+ char *schemaname;
+ char *collation_name;
+ int32 dbencoding = GetDatabaseEncoding();
+ Oid namespaceId;
+ Oid colloid;
+ ListCell *l;
+
+ /* deconstruct the name list */
+ DeconstructQualifiedName(name, &schemaname, &collation_name);
+
+ if (schemaname)
+ {
+ /* use exact schema given */
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ return InvalidOid;
+
+ /* first try for encoding-specific entry, then any-encoding */
+ colloid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collation_name),
+ Int32GetDatum(dbencoding),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(colloid))
+ return colloid;
+ colloid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collation_name),
+ Int32GetDatum(-1),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(colloid))
+ return colloid;
+ }
+ else
+ {
+ /* search for it in search path */
+ recomputeNamespacePath();
+
+ foreach(l, activeSearchPath)
+ {
+ namespaceId = lfirst_oid(l);
+
+ if (namespaceId == myTempNamespace)
+ continue; /* do not look in temp namespace */
+
+ colloid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collation_name),
+ Int32GetDatum(dbencoding),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(colloid))
+ return colloid;
+ colloid = GetSysCacheOid3(COLLNAMEENCNSP,
+ PointerGetDatum(collation_name),
+ Int32GetDatum(-1),
+ ObjectIdGetDatum(namespaceId));
+ if (OidIsValid(colloid))
+ return colloid;
+ }
+ }
+
+ /* Not found in path */
+ if (!missing_ok)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("collation \"%s\" for encoding \"%s\" does not exist",
+ NameListToString(name), GetDatabaseEncodingName())));
+ return InvalidOid;
+}
+
+/*
+ * get_conversion_oid - find a conversion by possibly qualified name
+ */
+Oid
+get_conversion_oid(List *name, bool missing_ok)
{
char *schemaname;
char *conversion_name;
Oid namespaceId;
- Oid conoid;
+ Oid conoid = InvalidOid;
ListCell *l;
/* deconstruct the name list */
if (schemaname)
{
/* use exact schema given */
- namespaceId = LookupExplicitNamespace(schemaname);
- return FindConversion(conversion_name, namespaceId);
+ namespaceId = LookupExplicitNamespace(schemaname, missing_ok);
+ if (missing_ok && !OidIsValid(namespaceId))
+ conoid = InvalidOid;
+ else
+ conoid = GetSysCacheOid2(CONNAMENSP,
+ PointerGetDatum(conversion_name),
+ ObjectIdGetDatum(namespaceId));
}
else
{
if (namespaceId == myTempNamespace)
continue; /* do not look in temp namespace */
- conoid = FindConversion(conversion_name, namespaceId);
+ conoid = GetSysCacheOid2(CONNAMENSP,
+ PointerGetDatum(conversion_name),
+ ObjectIdGetDatum(namespaceId));
if (OidIsValid(conoid))
return conoid;
}
}
/* Not found in path */
- return InvalidOid;
+ if (!OidIsValid(conoid) && !missing_ok)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("conversion \"%s\" does not exist",
+ NameListToString(name))));
+ return conoid;
}
/*
* FindDefaultConversionProc - find default encoding conversion proc
*/
Oid
-FindDefaultConversionProc(int4 for_encoding, int4 to_encoding)
+FindDefaultConversionProc(int32 for_encoding, int32 to_encoding)
{
Oid proc;
ListCell *l;
/* $user --- substitute namespace matching user name, if any */
HeapTuple tuple;
- tuple = SearchSysCache(AUTHOID,
- ObjectIdGetDatum(roleid),
- 0, 0, 0);
+ tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(roleid));
if (HeapTupleIsValid(tuple))
{
char *rname;
rname = NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname);
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(rname),
- 0, 0, 0);
+ namespaceId = get_namespace_oid(rname, true);
ReleaseSysCache(tuple);
if (OidIsValid(namespaceId) &&
!list_member_oid(oidlist, namespaceId) &&
pg_namespace_aclcheck(namespaceId, roleid,
- ACL_USAGE) == ACLCHECK_OK)
+ ACL_USAGE) == ACLCHECK_OK &&
+ InvokeNamespaceSearchHook(namespaceId, false))
oidlist = lappend_oid(oidlist, namespaceId);
}
}
/* pg_temp --- substitute temp namespace, if any */
if (OidIsValid(myTempNamespace))
{
- if (!list_member_oid(oidlist, myTempNamespace))
+ if (!list_member_oid(oidlist, myTempNamespace) &&
+ InvokeNamespaceSearchHook(myTempNamespace, false))
oidlist = lappend_oid(oidlist, myTempNamespace);
}
else
else
{
/* normal namespace reference */
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(curname),
- 0, 0, 0);
+ namespaceId = get_namespace_oid(curname, true);
if (OidIsValid(namespaceId) &&
!list_member_oid(oidlist, namespaceId) &&
pg_namespace_aclcheck(namespaceId, roleid,
- ACL_USAGE) == ACLCHECK_OK)
+ ACL_USAGE) == ACLCHECK_OK &&
+ InvokeNamespaceSearchHook(namespaceId, false))
oidlist = lappend_oid(oidlist, namespaceId);
}
}
/*
- * Remember the first member of the explicit list. (Note: this is
+ * Remember the first member of the explicit list. (Note: this is
* nominally wrong if temp_missing, but we need it anyway to distinguish
* explicit from implicit mention of pg_catalog.)
*/
firstNS = linitial_oid(oidlist);
/*
- * Add any implicitly-searched namespaces to the list. Note these go on
+ * Add any implicitly-searched namespaces to the list. Note these go on
* the front, not the back; also notice that we do not check USAGE
* permissions for these.
*/
/*
* First, do permission check to see if we are authorized to make temp
- * tables. We use a nonstandard error message here since "databasename:
+ * tables. We use a nonstandard error message here since "databasename:
* permission denied" might be a tad cryptic.
*
* Note that ACL_CREATE_TEMP rights are rechecked in pg_namespace_aclmask;
errmsg("permission denied to create temporary tables in database \"%s\"",
get_database_name(MyDatabaseId))));
+ /*
+ * Do not allow a Hot Standby slave session to make temp tables. Aside
+ * from problems with modifying the system catalogs, there is a naming
+ * conflict: pg_temp_N belongs to the session with BackendId N on the
+ * master, not to a slave session with the same BackendId. We should not
+ * be able to get here anyway due to XactReadOnly checks, but let's just
+ * make real sure. Note that this also backstops various operations that
+ * allow XactReadOnly transactions to modify temp tables; they'd need
+ * RecoveryInProgress checks if not for this.
+ */
+ if (RecoveryInProgress())
+ ereport(ERROR,
+ (errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
+ errmsg("cannot create temporary tables during recovery")));
+
+ /* Parallel workers can't create temporary tables, either. */
+ if (IsParallelWorker())
+ ereport(ERROR,
+ (errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
+ errmsg("cannot create temporary tables in parallel mode")));
+
snprintf(namespaceName, sizeof(namespaceName), "pg_temp_%d", MyBackendId);
- namespaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(namespaceName),
- 0, 0, 0);
+ namespaceId = get_namespace_oid(namespaceName, true);
if (!OidIsValid(namespaceId))
{
/*
* temp tables. This works because the places that access the temp
* namespace for my own backend skip permissions checks on it.
*/
- namespaceId = NamespaceCreate(namespaceName, BOOTSTRAP_SUPERUSERID);
+ namespaceId = NamespaceCreate(namespaceName, BOOTSTRAP_SUPERUSERID,
+ true);
/* Advance command counter to make namespace visible */
CommandCounterIncrement();
}
}
/*
- * If the corresponding toast-table namespace doesn't exist yet, create it.
- * (We assume there is no need to clean it out if it does exist, since
+ * If the corresponding toast-table namespace doesn't exist yet, create
+ * it. (We assume there is no need to clean it out if it does exist, since
* dropping a parent table should make its toast table go away.)
*/
snprintf(namespaceName, sizeof(namespaceName), "pg_toast_temp_%d",
MyBackendId);
- toastspaceId = GetSysCacheOid(NAMESPACENAME,
- CStringGetDatum(namespaceName),
- 0, 0, 0);
+ toastspaceId = get_namespace_oid(namespaceName, true);
if (!OidIsValid(toastspaceId))
{
- toastspaceId = NamespaceCreate(namespaceName, BOOTSTRAP_SUPERUSERID);
+ toastspaceId = NamespaceCreate(namespaceName, BOOTSTRAP_SUPERUSERID,
+ true);
/* Advance command counter to make namespace visible */
CommandCounterIncrement();
}
* End-of-transaction cleanup for namespaces.
*/
void
-AtEOXact_Namespace(bool isCommit)
+AtEOXact_Namespace(bool isCommit, bool parallel)
{
/*
* If we abort the transaction in which a temp namespace was selected,
* at backend shutdown. (We only want to register the callback once per
* session, so this is a good place to do it.)
*/
- if (myTempNamespaceSubID != InvalidSubTransactionId)
+ if (myTempNamespaceSubID != InvalidSubTransactionId && !parallel)
{
if (isCommit)
- on_shmem_exit(RemoveTempRelationsCallback, 0);
+ before_shmem_exit(RemoveTempRelationsCallback, 0);
else
{
myTempNamespace = InvalidOid;
* Routines for handling the GUC variable 'search_path'.
*/
-/* assign_hook: validate new search_path, do extra actions as needed */
-const char *
-assign_search_path(const char *newval, bool doit, GucSource source)
+/* check_hook: validate new search_path value */
+bool
+check_search_path(char **newval, void **extra, GucSource source)
{
char *rawname;
List *namelist;
- ListCell *l;
/* Need a modifiable copy of string */
- rawname = pstrdup(newval);
+ rawname = pstrdup(*newval);
/* Parse string into list of identifiers */
if (!SplitIdentifierString(rawname, ',', &namelist))
{
/* syntax error in name list */
+ GUC_check_errdetail("List syntax is invalid.");
pfree(rawname);
list_free(namelist);
- return NULL;
+ return false;
}
/*
- * If we aren't inside a transaction, we cannot do database access so
- * cannot verify the individual names. Must accept the list on faith.
+ * We used to try to check that the named schemas exist, but there are
+ * many valid use-cases for having search_path settings that include
+ * schemas that don't exist; and often, we are not inside a transaction
+ * here and so can't consult the system catalogs anyway. So now, the only
+ * requirement is syntactic validity of the identifier list.
*/
- if (source >= PGC_S_INTERACTIVE && IsTransactionState())
- {
- /*
- * Verify that all the names are either valid namespace names or
- * "$user" or "pg_temp". We do not require $user to correspond to a
- * valid namespace, and pg_temp might not exist yet. We do not check
- * for USAGE rights, either; should we?
- *
- * When source == PGC_S_TEST, we are checking the argument of an ALTER
- * DATABASE SET or ALTER USER SET command. It could be that the
- * intended use of the search path is for some other database, so we
- * should not error out if it mentions schemas not present in the
- * current database. We reduce the message to NOTICE instead.
- */
- foreach(l, namelist)
- {
- char *curname = (char *) lfirst(l);
-
- if (strcmp(curname, "$user") == 0)
- continue;
- if (strcmp(curname, "pg_temp") == 0)
- continue;
- if (!SearchSysCacheExists(NAMESPACENAME,
- CStringGetDatum(curname),
- 0, 0, 0))
- ereport((source == PGC_S_TEST) ? NOTICE : ERROR,
- (errcode(ERRCODE_UNDEFINED_SCHEMA),
- errmsg("schema \"%s\" does not exist", curname)));
- }
- }
pfree(rawname);
list_free(namelist);
+ return true;
+}
+
+/* assign_hook: do extra actions as needed */
+void
+assign_search_path(const char *newval, void *extra)
+{
/*
* We mark the path as needing recomputation, but don't do anything until
* it's needed. This avoids trying to do database access during GUC
- * initialization.
+ * initialization, or outside a transaction.
*/
- if (doit)
- baseSearchPathValid = false;
-
- return newval;
+ baseSearchPathValid = false;
}
/*
* Syscache inval callback function
*/
static void
-NamespaceCallback(Datum arg, int cacheid, ItemPointer tuplePtr)
+NamespaceCallback(Datum arg, int cacheid, uint32 hashvalue)
{
/* Force search path to be recomputed on next use */
baseSearchPathValid = false;
/*
* If the temp namespace should be first, force it to exist. This is so
* that callers can trust the result to reflect the actual default
- * creation namespace. It's a bit bogus to do this here, since
+ * creation namespace. It's a bit bogus to do this here, since
* current_schema() is supposedly a stable function without side-effects,
* but the alternatives seem worse.
*/
* a nonexistent object OID, rather than failing. This is to avoid race
* condition errors when a query that's scanning a catalog using an MVCC
* snapshot uses one of these functions. The underlying IsVisible functions
- * operate on SnapshotNow semantics and so might see the object as already
- * gone when it's still visible to the MVCC snapshot. (There is no race
+ * always use an up-to-date snapshot and so might see the object as already
+ * gone when it's still visible to the transaction snapshot. (There is no race
* condition in the current coding because we don't accept sinval messages
* between the SearchSysCacheExists test and the subsequent lookup.)
*/
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(RELOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(RelationIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(TYPEOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(TYPEOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(TypeIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(PROCOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(PROCOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(FunctionIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(OPEROID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(OPEROID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(OperatorIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(CLAOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(CLAOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(OpclassIsVisible(oid));
}
+Datum
+pg_opfamily_is_visible(PG_FUNCTION_ARGS)
+{
+ Oid oid = PG_GETARG_OID(0);
+
+ if (!SearchSysCacheExists1(OPFAMILYOID, ObjectIdGetDatum(oid)))
+ PG_RETURN_NULL();
+
+ PG_RETURN_BOOL(OpfamilyIsVisible(oid));
+}
+
+Datum
+pg_collation_is_visible(PG_FUNCTION_ARGS)
+{
+ Oid oid = PG_GETARG_OID(0);
+
+ if (!SearchSysCacheExists1(COLLOID, ObjectIdGetDatum(oid)))
+ PG_RETURN_NULL();
+
+ PG_RETURN_BOOL(CollationIsVisible(oid));
+}
+
Datum
pg_conversion_is_visible(PG_FUNCTION_ARGS)
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(CONVOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(CONVOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(ConversionIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(TSPARSEROID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(TSPARSEROID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(TSParserIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(TSDICTOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(TSDICTOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(TSDictionaryIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(TSTEMPLATEOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(TSTEMPLATEOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(TSTemplateIsVisible(oid));
{
Oid oid = PG_GETARG_OID(0);
- if (!SearchSysCacheExists(TSCONFIGOID,
- ObjectIdGetDatum(oid),
- 0, 0, 0))
+ if (!SearchSysCacheExists1(TSCONFIGOID, ObjectIdGetDatum(oid)))
PG_RETURN_NULL();
PG_RETURN_BOOL(TSConfigIsVisible(oid));
projects / postgresql / blobdiff