* Routines to support inter-object dependencies.
*
*
- * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.38 2004/08/29 04:12:27 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.76 2008/06/14 18:04:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "access/genam.h"
#include "access/heapam.h"
-#include "catalog/catname.h"
+#include "access/sysattr.h"
+#include "access/xact.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
+#include "catalog/pg_amop.h"
+#include "catalog/pg_amproc.h"
#include "catalog/pg_attrdef.h"
+#include "catalog/pg_authid.h"
#include "catalog/pg_cast.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_conversion.h"
+#include "catalog/pg_conversion_fn.h"
+#include "catalog/pg_database.h"
#include "catalog/pg_depend.h"
#include "catalog/pg_language.h"
+#include "catalog/pg_namespace.h"
#include "catalog/pg_opclass.h"
+#include "catalog/pg_operator.h"
+#include "catalog/pg_opfamily.h"
+#include "catalog/pg_proc.h"
#include "catalog/pg_rewrite.h"
+#include "catalog/pg_tablespace.h"
#include "catalog/pg_trigger.h"
+#include "catalog/pg_ts_config.h"
+#include "catalog/pg_ts_dict.h"
+#include "catalog/pg_ts_parser.h"
+#include "catalog/pg_ts_template.h"
+#include "catalog/pg_type.h"
#include "commands/comment.h"
+#include "commands/dbcommands.h"
#include "commands/defrem.h"
#include "commands/proclang.h"
#include "commands/schemacmds.h"
+#include "commands/tablespace.h"
#include "commands/trigger.h"
#include "commands/typecmds.h"
-#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "optimizer/clauses.h"
#include "parser/parsetree.h"
#include "rewrite/rewriteRemove.h"
+#include "storage/lmgr.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
+#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
+#include "utils/tqual.h"
-/* expansible list of ObjectAddresses */
+/*
+ * Deletion processing requires additional state for each ObjectAddress that
+ * it's planning to delete. For simplicity and code-sharing we make the
+ * ObjectAddresses code support arrays with or without this extra state.
+ */
typedef struct
+{
+ int flags; /* bitmask, see bit definitions below */
+ ObjectAddress dependee; /* object whose deletion forced this one */
+} ObjectAddressExtra;
+
+/* ObjectAddressExtra flag bits */
+#define DEPFLAG_ORIGINAL 0x0001 /* an original deletion target */
+#define DEPFLAG_NORMAL 0x0002 /* reached via normal dependency */
+#define DEPFLAG_AUTO 0x0004 /* reached via auto dependency */
+#define DEPFLAG_INTERNAL 0x0008 /* reached via internal dependency */
+
+
+/* expansible list of ObjectAddresses */
+struct ObjectAddresses
{
ObjectAddress *refs; /* => palloc'd array */
+ ObjectAddressExtra *extras; /* => palloc'd array, or NULL if not used */
int numrefs; /* current number of references */
- int maxrefs; /* current size of palloc'd array */
-} ObjectAddresses;
+ int maxrefs; /* current size of palloc'd array(s) */
+};
+
+/* typedef ObjectAddresses appears in dependency.h */
+
+/* threaded list of ObjectAddresses, for recursion detection */
+typedef struct ObjectAddressStack
+{
+ const ObjectAddress *object; /* object being visited */
+ int flags; /* its current flag bits */
+ struct ObjectAddressStack *next; /* next outer stack level */
+} ObjectAddressStack;
/* for find_expr_references_walker */
typedef struct
{
- ObjectAddresses addrs; /* addresses being accumulated */
+ ObjectAddresses *addrs; /* addresses being accumulated */
List *rtables; /* list of rangetables to resolve Vars */
} find_expr_references_context;
-
/*
- * Because not all system catalogs have predetermined OIDs, we build a table
- * mapping between ObjectClasses and OIDs. This is done at most once per
- * backend run, to minimize lookup overhead.
+ * This constant table maps ObjectClasses to the corresponding catalog OIDs.
+ * See also getObjectClass().
*/
-static bool object_classes_initialized = false;
-static Oid object_classes[MAX_OCLASS];
-
-
-static void findAutoDeletableObjects(const ObjectAddress *object,
- ObjectAddresses *oktodelete,
- Relation depRel);
-static bool recursiveDeletion(const ObjectAddress *object,
- DropBehavior behavior,
- int msglevel,
- const ObjectAddress *callingObject,
- ObjectAddresses *oktodelete,
- Relation depRel);
-static bool deleteDependentObjects(const ObjectAddress *object,
- const char *objDescription,
+static const Oid object_classes[MAX_OCLASS] = {
+ RelationRelationId, /* OCLASS_CLASS */
+ ProcedureRelationId, /* OCLASS_PROC */
+ TypeRelationId, /* OCLASS_TYPE */
+ CastRelationId, /* OCLASS_CAST */
+ ConstraintRelationId, /* OCLASS_CONSTRAINT */
+ ConversionRelationId, /* OCLASS_CONVERSION */
+ AttrDefaultRelationId, /* OCLASS_DEFAULT */
+ LanguageRelationId, /* OCLASS_LANGUAGE */
+ OperatorRelationId, /* OCLASS_OPERATOR */
+ OperatorClassRelationId, /* OCLASS_OPCLASS */
+ OperatorFamilyRelationId, /* OCLASS_OPFAMILY */
+ AccessMethodOperatorRelationId, /* OCLASS_AMOP */
+ AccessMethodProcedureRelationId, /* OCLASS_AMPROC */
+ RewriteRelationId, /* OCLASS_REWRITE */
+ TriggerRelationId, /* OCLASS_TRIGGER */
+ NamespaceRelationId, /* OCLASS_SCHEMA */
+ TSParserRelationId, /* OCLASS_TSPARSER */
+ TSDictionaryRelationId, /* OCLASS_TSDICT */
+ TSTemplateRelationId, /* OCLASS_TSTEMPLATE */
+ TSConfigRelationId, /* OCLASS_TSCONFIG */
+ AuthIdRelationId, /* OCLASS_ROLE */
+ DatabaseRelationId, /* OCLASS_DATABASE */
+ TableSpaceRelationId /* OCLASS_TBLSPACE */
+};
+
+
+static void findDependentObjects(const ObjectAddress *object,
+ int flags,
+ ObjectAddressStack *stack,
+ ObjectAddresses *targetObjects,
+ const ObjectAddresses *pendingObjects,
+ Relation depRel);
+static void reportDependentObjects(const ObjectAddresses *targetObjects,
DropBehavior behavior,
int msglevel,
- ObjectAddresses *oktodelete,
- Relation depRel);
+ const ObjectAddress *origObject);
+static void deleteOneObject(const ObjectAddress *object, Relation depRel);
static void doDeletion(const ObjectAddress *object);
+static void AcquireDeletionLock(const ObjectAddress *object);
+static void ReleaseDeletionLock(const ObjectAddress *object);
static bool find_expr_references_walker(Node *node,
find_expr_references_context *context);
static void eliminate_duplicate_dependencies(ObjectAddresses *addrs);
static int object_address_comparator(const void *a, const void *b);
-static void init_object_addresses(ObjectAddresses *addrs);
static void add_object_address(ObjectClass oclass, Oid objectId, int32 subId,
ObjectAddresses *addrs);
-static void add_exact_object_address(const ObjectAddress *object,
- ObjectAddresses *addrs);
-static bool object_address_present(const ObjectAddress *object,
- ObjectAddresses *addrs);
-static void term_object_addresses(ObjectAddresses *addrs);
-static void init_object_classes(void);
+static void add_exact_object_address_extra(const ObjectAddress *object,
+ const ObjectAddressExtra *extra,
+ ObjectAddresses *addrs);
+static bool object_address_present_add_flags(const ObjectAddress *object,
+ int flags,
+ ObjectAddresses *addrs);
static void getRelationDescription(StringInfo buffer, Oid relid);
+static void getOpFamilyDescription(StringInfo buffer, Oid opfid);
/*
* according to the dependency type.
*
* This is the outer control routine for all forms of DROP that drop objects
- * that can participate in dependencies.
+ * that can participate in dependencies. Note that the next two routines
+ * are variants on the same theme; if you change anything here you'll likely
+ * need to fix them too.
*/
void
performDeletion(const ObjectAddress *object,
DropBehavior behavior)
{
- char *objDescription;
Relation depRel;
- ObjectAddresses oktodelete;
+ ObjectAddresses *targetObjects;
+ int i;
/*
- * Get object description for possible use in failure message. Must do
- * this before deleting it ...
+ * We save some cycles by opening pg_depend just once and passing the
+ * Relation pointer down to all the recursive deletion steps.
*/
- objDescription = getObjectDescription(object);
+ depRel = heap_open(DependRelationId, RowExclusiveLock);
+
+ /*
+ * Acquire deletion lock on the target object. (Ideally the caller has
+ * done this already, but many places are sloppy about it.)
+ */
+ AcquireDeletionLock(object);
+
+ /*
+ * Construct a list of objects to delete (ie, the given object plus
+ * everything directly or indirectly dependent on it).
+ */
+ targetObjects = new_object_addresses();
+
+ findDependentObjects(object,
+ DEPFLAG_ORIGINAL,
+ NULL, /* empty stack */
+ targetObjects,
+ NULL, /* no pendingObjects */
+ depRel);
+
+ /*
+ * Check if deletion is allowed, and report about cascaded deletes.
+ */
+ reportDependentObjects(targetObjects,
+ behavior,
+ NOTICE,
+ object);
+
+ /*
+ * Delete all the objects in the proper order.
+ */
+ for (i = 0; i < targetObjects->numrefs; i++)
+ {
+ ObjectAddress *thisobj = targetObjects->refs + i;
+
+ deleteOneObject(thisobj, depRel);
+ }
+
+ /* And clean up */
+ free_object_addresses(targetObjects);
+
+ heap_close(depRel, RowExclusiveLock);
+}
+
+/*
+ * performMultipleDeletions: Similar to performDeletion, but act on multiple
+ * objects at once.
+ *
+ * The main difference from issuing multiple performDeletion calls is that the
+ * list of objects that would be implicitly dropped, for each object to be
+ * dropped, is the union of the implicit-object list for all objects. This
+ * makes each check be more relaxed.
+ */
+void
+performMultipleDeletions(const ObjectAddresses *objects,
+ DropBehavior behavior)
+{
+ Relation depRel;
+ ObjectAddresses *targetObjects;
+ int i;
+
+ /* No work if no objects... */
+ if (objects->numrefs <= 0)
+ return;
/*
* We save some cycles by opening pg_depend just once and passing the
* Relation pointer down to all the recursive deletion steps.
*/
- depRel = heap_openr(DependRelationName, RowExclusiveLock);
+ depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
- * Construct a list of objects that are reachable by AUTO or INTERNAL
- * dependencies from the target object. These should be deleted
- * silently, even if the actual deletion pass first reaches one of
- * them via a non-auto dependency.
+ * Construct a list of objects to delete (ie, the given objects plus
+ * everything directly or indirectly dependent on them). Note that
+ * because we pass the whole objects list as pendingObjects context,
+ * we won't get a failure from trying to delete an object that is
+ * internally dependent on another one in the list; we'll just skip
+ * that object and delete it when we reach its owner.
*/
- init_object_addresses(&oktodelete);
+ targetObjects = new_object_addresses();
- findAutoDeletableObjects(object, &oktodelete, depRel);
+ for (i = 0; i < objects->numrefs; i++)
+ {
+ const ObjectAddress *thisobj = objects->refs + i;
- if (!recursiveDeletion(object, behavior, NOTICE,
- NULL, &oktodelete, depRel))
- ereport(ERROR,
- (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
- errmsg("cannot drop %s because other objects depend on it",
- objDescription),
- errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
+ /*
+ * Acquire deletion lock on each target object. (Ideally the caller
+ * has done this already, but many places are sloppy about it.)
+ */
+ AcquireDeletionLock(thisobj);
+
+ findDependentObjects(thisobj,
+ DEPFLAG_ORIGINAL,
+ NULL, /* empty stack */
+ targetObjects,
+ objects,
+ depRel);
+ }
- term_object_addresses(&oktodelete);
+ /*
+ * Check if deletion is allowed, and report about cascaded deletes.
+ *
+ * If there's exactly one object being deleted, report it the same
+ * way as in performDeletion(), else we have to be vaguer.
+ */
+ reportDependentObjects(targetObjects,
+ behavior,
+ NOTICE,
+ (objects->numrefs == 1 ? objects->refs : NULL));
- heap_close(depRel, RowExclusiveLock);
+ /*
+ * Delete all the objects in the proper order.
+ */
+ for (i = 0; i < targetObjects->numrefs; i++)
+ {
+ ObjectAddress *thisobj = targetObjects->refs + i;
- pfree(objDescription);
-}
+ deleteOneObject(thisobj, depRel);
+ }
+ /* And clean up */
+ free_object_addresses(targetObjects);
+
+ heap_close(depRel, RowExclusiveLock);
+}
/*
* deleteWhatDependsOn: attempt to drop everything that depends on the
deleteWhatDependsOn(const ObjectAddress *object,
bool showNotices)
{
- char *objDescription;
Relation depRel;
- ObjectAddresses oktodelete;
+ ObjectAddresses *targetObjects;
+ int i;
/*
- * Get object description for possible use in failure messages
+ * We save some cycles by opening pg_depend just once and passing the
+ * Relation pointer down to all the recursive deletion steps.
*/
- objDescription = getObjectDescription(object);
+ depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
- * We save some cycles by opening pg_depend just once and passing the
- * Relation pointer down to all the recursive deletion steps.
+ * Acquire deletion lock on the target object. (Ideally the caller has
+ * done this already, but many places are sloppy about it.)
*/
- depRel = heap_openr(DependRelationName, RowExclusiveLock);
+ AcquireDeletionLock(object);
/*
- * Construct a list of objects that are reachable by AUTO or INTERNAL
- * dependencies from the target object. These should be deleted
- * silently, even if the actual deletion pass first reaches one of
- * them via a non-auto dependency.
+ * Construct a list of objects to delete (ie, the given object plus
+ * everything directly or indirectly dependent on it).
*/
- init_object_addresses(&oktodelete);
+ targetObjects = new_object_addresses();
- findAutoDeletableObjects(object, &oktodelete, depRel);
+ findDependentObjects(object,
+ DEPFLAG_ORIGINAL,
+ NULL, /* empty stack */
+ targetObjects,
+ NULL, /* no pendingObjects */
+ depRel);
/*
- * Now invoke only step 2 of recursiveDeletion: just recurse to the
- * stuff dependent on the given object.
+ * Check if deletion is allowed, and report about cascaded deletes.
*/
- if (!deleteDependentObjects(object, objDescription,
- DROP_CASCADE,
- showNotices ? NOTICE : DEBUG2,
- &oktodelete, depRel))
- ereport(ERROR,
- (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
- errmsg("failed to drop all objects depending on %s",
- objDescription)));
+ reportDependentObjects(targetObjects,
+ DROP_CASCADE,
+ showNotices ? NOTICE : DEBUG2,
+ object);
/*
- * We do not need CommandCounterIncrement here, since if step 2 did
- * anything then each recursive call will have ended with one.
+ * Delete all the objects in the proper order, except we skip the original
+ * object.
*/
+ for (i = 0; i < targetObjects->numrefs; i++)
+ {
+ ObjectAddress *thisobj = targetObjects->refs + i;
+ ObjectAddressExtra *thisextra = targetObjects->extras + i;
- term_object_addresses(&oktodelete);
+ if (thisextra->flags & DEPFLAG_ORIGINAL)
+ continue;
- heap_close(depRel, RowExclusiveLock);
+ deleteOneObject(thisobj, depRel);
+ }
- pfree(objDescription);
-}
+ /* And clean up */
+ free_object_addresses(targetObjects);
+ heap_close(depRel, RowExclusiveLock);
+}
/*
- * findAutoDeletableObjects: find all objects that are reachable by AUTO or
- * INTERNAL dependency paths from the given object. Add them all to the
- * oktodelete list. Note that the originally given object will also be
- * added to the list.
+ * findDependentObjects - find all objects that depend on 'object'
*
- * depRel is the already-open pg_depend relation.
+ * For every object that depends on the starting object, acquire a deletion
+ * lock on the object, add it to targetObjects (if not already there),
+ * and recursively find objects that depend on it. An object's dependencies
+ * will be placed into targetObjects before the object itself; this means
+ * that the finished list's order represents a safe deletion order.
+ *
+ * The caller must already have a deletion lock on 'object' itself,
+ * but must not have added it to targetObjects. (Note: there are corner
+ * cases where we won't add the object either, and will also release the
+ * caller-taken lock. This is a bit ugly, but the API is set up this way
+ * to allow easy rechecking of an object's liveness after we lock it. See
+ * notes within the function.)
+ *
+ * When dropping a whole object (subId = 0), we find dependencies for
+ * its sub-objects too.
+ *
+ * object: the object to add to targetObjects and find dependencies on
+ * flags: flags to be ORed into the object's targetObjects entry
+ * stack: list of objects being visited in current recursion; topmost item
+ * is the object that we recursed from (NULL for external callers)
+ * targetObjects: list of objects that are scheduled to be deleted
+ * pendingObjects: list of other objects slated for destruction, but
+ * not necessarily in targetObjects yet (can be NULL if none)
+ * depRel: already opened pg_depend relation
*/
static void
-findAutoDeletableObjects(const ObjectAddress *object,
- ObjectAddresses *oktodelete,
- Relation depRel)
+findDependentObjects(const ObjectAddress *object,
+ int flags,
+ ObjectAddressStack *stack,
+ ObjectAddresses *targetObjects,
+ const ObjectAddresses *pendingObjects,
+ Relation depRel)
{
ScanKeyData key[3];
int nkeys;
SysScanDesc scan;
HeapTuple tup;
ObjectAddress otherObject;
+ ObjectAddressStack mystack;
+ ObjectAddressExtra extra;
+ ObjectAddressStack *stackptr;
/*
- * If this object is already in oktodelete, then we already visited
- * it; don't do so again (this prevents infinite recursion if there's
- * a loop in pg_depend). Otherwise, add it.
+ * If the target object is already being visited in an outer recursion
+ * level, just report the current flags back to that level and exit.
+ * This is needed to avoid infinite recursion in the face of circular
+ * dependencies.
+ *
+ * The stack check alone would result in dependency loops being broken at
+ * an arbitrary point, ie, the first member object of the loop to be
+ * visited is the last one to be deleted. This is obviously unworkable.
+ * However, the check for internal dependency below guarantees that we
+ * will not break a loop at an internal dependency: if we enter the loop
+ * at an "owned" object we will switch and start at the "owning" object
+ * instead. We could probably hack something up to avoid breaking at an
+ * auto dependency, too, if we had to. However there are no known cases
+ * where that would be necessary.
*/
- if (object_address_present(object, oktodelete))
- return;
- add_exact_object_address(object, oktodelete);
+ for (stackptr = stack; stackptr; stackptr = stackptr->next)
+ {
+ if (object->classId == stackptr->object->classId &&
+ object->objectId == stackptr->object->objectId)
+ {
+ if (object->objectSubId == stackptr->object->objectSubId)
+ {
+ stackptr->flags |= flags;
+ return;
+ }
+ /*
+ * Could visit column with whole table already on stack; this is
+ * the same case noted in object_address_present_add_flags().
+ * (It's not clear this can really happen, but we might as well
+ * check.)
+ */
+ if (stackptr->object->objectSubId == 0)
+ return;
+ }
+ }
/*
- * Scan pg_depend records that link to this object, showing the things
- * that depend on it. For each one that is AUTO or INTERNAL, visit
- * the referencing object.
+ * It's also possible that the target object has already been completely
+ * processed and put into targetObjects. If so, again we just add the
+ * specified flags to its entry and return.
*
- * When dropping a whole object (subId = 0), find pg_depend records for
- * its sub-objects too.
+ * (Note: in these early-exit cases we could release the caller-taken
+ * lock, since the object is presumably now locked multiple times;
+ * but it seems not worth the cycles.)
+ */
+ if (object_address_present_add_flags(object, flags, targetObjects))
+ return;
+
+ /*
+ * The target object might be internally dependent on some other object
+ * (its "owner"). If so, and if we aren't recursing from the owning
+ * object, we have to transform this deletion request into a deletion
+ * request of the owning object. (We'll eventually recurse back to this
+ * object, but the owning object has to be visited first so it will be
+ * deleted after.) The way to find out about this is to scan the
+ * pg_depend entries that show what this object depends on.
*/
ScanKeyInit(&key[0],
- Anum_pg_depend_refclassid,
+ Anum_pg_depend_classid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
- Anum_pg_depend_refobjid,
+ Anum_pg_depend_objid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
- Anum_pg_depend_refobjsubid,
+ Anum_pg_depend_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
else
nkeys = 2;
- scan = systable_beginscan(depRel, DependReferenceIndex, true,
+ scan = systable_beginscan(depRel, DependDependerIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
+ otherObject.classId = foundDep->refclassid;
+ otherObject.objectId = foundDep->refobjid;
+ otherObject.objectSubId = foundDep->refobjsubid;
+
switch (foundDep->deptype)
{
case DEPENDENCY_NORMAL:
- /* ignore */
- break;
case DEPENDENCY_AUTO:
- case DEPENDENCY_INTERNAL:
- /* recurse */
- otherObject.classId = foundDep->classid;
- otherObject.objectId = foundDep->objid;
- otherObject.objectSubId = foundDep->objsubid;
- findAutoDeletableObjects(&otherObject, oktodelete, depRel);
+ /* no problem */
break;
+ case DEPENDENCY_INTERNAL:
+
+ /*
+ * This object is part of the internal implementation of
+ * another object. We have three cases:
+ *
+ * 1. At the outermost recursion level, disallow the DROP. (We
+ * just ereport here, rather than proceeding, since no other
+ * dependencies are likely to be interesting.) However, if
+ * the other object is listed in pendingObjects, just release
+ * the caller's lock and return; we'll eventually complete
+ * the DROP when we reach that entry in the pending list.
+ */
+ if (stack == NULL)
+ {
+ char *otherObjDesc;
+
+ if (object_address_present(&otherObject, pendingObjects))
+ {
+ systable_endscan(scan);
+ /* need to release caller's lock; see notes below */
+ ReleaseDeletionLock(object);
+ return;
+ }
+ otherObjDesc = getObjectDescription(&otherObject);
+ ereport(ERROR,
+ (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
+ errmsg("cannot drop %s because %s requires it",
+ getObjectDescription(object),
+ otherObjDesc),
+ errhint("You can drop %s instead.",
+ otherObjDesc)));
+ }
+
+ /*
+ * 2. When recursing from the other end of this dependency,
+ * it's okay to continue with the deletion. This holds when
+ * recursing from a whole object that includes the nominal
+ * other end as a component, too.
+ */
+ if (stack->object->classId == otherObject.classId &&
+ stack->object->objectId == otherObject.objectId &&
+ (stack->object->objectSubId == otherObject.objectSubId ||
+ stack->object->objectSubId == 0))
+ break;
+
+ /*
+ * 3. When recursing from anyplace else, transform this
+ * deletion request into a delete of the other object.
+ *
+ * First, release caller's lock on this object and get
+ * deletion lock on the other object. (We must release
+ * caller's lock to avoid deadlock against a concurrent
+ * deletion of the other object.)
+ */
+ ReleaseDeletionLock(object);
+ AcquireDeletionLock(&otherObject);
+
+ /*
+ * The other object might have been deleted while we waited
+ * to lock it; if so, neither it nor the current object are
+ * interesting anymore. We test this by checking the
+ * pg_depend entry (see notes below).
+ */
+ if (!systable_recheck_tuple(scan, tup))
+ {
+ systable_endscan(scan);
+ ReleaseDeletionLock(&otherObject);
+ return;
+ }
+
+ /*
+ * Okay, recurse to the other object instead of proceeding.
+ * We treat this exactly as if the original reference had
+ * linked to that object instead of this one; hence, pass
+ * through the same flags and stack.
+ */
+ findDependentObjects(&otherObject,
+ flags,
+ stack,
+ targetObjects,
+ pendingObjects,
+ depRel);
+ /* And we're done here. */
+ systable_endscan(scan);
+ return;
case DEPENDENCY_PIN:
/*
- * For a PIN dependency we just ereport immediately; there
- * won't be any others to examine, and we aren't ever
- * going to let the user delete it.
+ * Should not happen; PIN dependencies should have zeroes in
+ * the depender fields...
*/
- ereport(ERROR,
- (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
- errmsg("cannot drop %s because it is required by the database system",
- getObjectDescription(object))));
+ elog(ERROR, "incorrect use of PIN dependency with %s",
+ getObjectDescription(object));
break;
default:
elog(ERROR, "unrecognized dependency type '%c' for %s",
}
systable_endscan(scan);
-}
-
-
-/*
- * recursiveDeletion: delete a single object for performDeletion, plus
- * (recursively) anything that depends on it.
- *
- * Returns TRUE if successful, FALSE if not.
- *
- * callingObject is NULL at the outer level, else identifies the object that
- * we recursed from (the reference object that someone else needs to delete).
- *
- * oktodelete is a list of objects verified deletable (ie, reachable by one
- * or more AUTO or INTERNAL dependencies from the original target).
- *
- * depRel is the already-open pg_depend relation.
- *
- *
- * In RESTRICT mode, we perform all the deletions anyway, but ereport a message
- * and return FALSE if we find a restriction violation. performDeletion
- * will then abort the transaction to nullify the deletions. We have to
- * do it this way to (a) report all the direct and indirect dependencies
- * while (b) not going into infinite recursion if there's a cycle.
- *
- * This is even more complex than one could wish, because it is possible for
- * the same pair of objects to be related by both NORMAL and AUTO/INTERNAL
- * dependencies. Also, we might have a situation where we've been asked to
- * delete object A, and objects B and C both have AUTO dependencies on A,
- * but B also has a NORMAL dependency on C. (Since any of these paths might
- * be indirect, we can't prevent these scenarios, but must cope instead.)
- * If we visit C before B then we would mistakenly decide that the B->C link
- * should prevent the restricted drop from occurring. To handle this, we make
- * a pre-scan to find all the objects that are auto-deletable from A. If we
- * visit C first, but B is present in the oktodelete list, then we make no
- * complaint but recurse to delete B anyway. (Note that in general we must
- * delete B before deleting C; the drop routine for B may try to access C.)
- *
- * Note: in the case where the path to B is traversed first, we will not
- * see the NORMAL dependency when we reach C, because of the pg_depend
- * removals done in step 1. The oktodelete list is necessary just
- * to make the behavior independent of the order in which pg_depend
- * entries are visited.
- */
-static bool
-recursiveDeletion(const ObjectAddress *object,
- DropBehavior behavior,
- int msglevel,
- const ObjectAddress *callingObject,
- ObjectAddresses *oktodelete,
- Relation depRel)
-{
- bool ok = true;
- char *objDescription;
- ScanKeyData key[3];
- int nkeys;
- SysScanDesc scan;
- HeapTuple tup;
- ObjectAddress otherObject;
- ObjectAddress owningObject;
- bool amOwned = false;
/*
- * Get object description for possible use in messages. Must do this
- * before deleting it ...
+ * Now recurse to any dependent objects. We must visit them first
+ * since they have to be deleted before the current object.
*/
- objDescription = getObjectDescription(object);
+ mystack.object = object; /* set up a new stack level */
+ mystack.flags = flags;
+ mystack.next = stack;
- /*
- * Step 1: find and remove pg_depend records that link from this
- * object to others. We have to do this anyway, and doing it first
- * ensures that we avoid infinite recursion in the case of cycles.
- * Also, some dependency types require extra processing here.
- *
- * When dropping a whole object (subId = 0), remove all pg_depend records
- * for its sub-objects too.
- */
ScanKeyInit(&key[0],
- Anum_pg_depend_classid,
+ Anum_pg_depend_refclassid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
- Anum_pg_depend_objid,
+ Anum_pg_depend_refobjid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
- Anum_pg_depend_objsubid,
+ Anum_pg_depend_refobjsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
else
nkeys = 2;
- scan = systable_beginscan(depRel, DependDependerIndex, true,
+ scan = systable_beginscan(depRel, DependReferenceIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
+ int subflags;
- otherObject.classId = foundDep->refclassid;
- otherObject.objectId = foundDep->refobjid;
- otherObject.objectSubId = foundDep->refobjsubid;
+ otherObject.classId = foundDep->classid;
+ otherObject.objectId = foundDep->objid;
+ otherObject.objectSubId = foundDep->objsubid;
+
+ /*
+ * Must lock the dependent object before recursing to it.
+ */
+ AcquireDeletionLock(&otherObject);
+ /*
+ * The dependent object might have been deleted while we waited
+ * to lock it; if so, we don't need to do anything more with it.
+ * We can test this cheaply and independently of the object's type
+ * by seeing if the pg_depend tuple we are looking at is still live.
+ * (If the object got deleted, the tuple would have been deleted too.)
+ */
+ if (!systable_recheck_tuple(scan, tup))
+ {
+ /* release the now-useless lock */
+ ReleaseDeletionLock(&otherObject);
+ /* and continue scanning for dependencies */
+ continue;
+ }
+
+ /* Recurse, passing flags indicating the dependency type */
switch (foundDep->deptype)
{
case DEPENDENCY_NORMAL:
+ subflags = DEPFLAG_NORMAL;
+ break;
case DEPENDENCY_AUTO:
- /* no problem */
+ subflags = DEPFLAG_AUTO;
break;
case DEPENDENCY_INTERNAL:
-
- /*
- * This object is part of the internal implementation of
- * another object. We have three cases:
- *
- * 1. At the outermost recursion level, disallow the DROP.
- * (We just ereport here, rather than proceeding, since no
- * other dependencies are likely to be interesting.)
- */
- if (callingObject == NULL)
- {
- char *otherObjDesc = getObjectDescription(&otherObject);
-
- ereport(ERROR,
- (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
- errmsg("cannot drop %s because %s requires it",
- objDescription, otherObjDesc),
- errhint("You may drop %s instead.",
- otherObjDesc)));
- }
-
- /*
- * 2. When recursing from the other end of this
- * dependency, it's okay to continue with the deletion.
- * This holds when recursing from a whole object that
- * includes the nominal other end as a component, too.
- */
- if (callingObject->classId == otherObject.classId &&
- callingObject->objectId == otherObject.objectId &&
- (callingObject->objectSubId == otherObject.objectSubId ||
- callingObject->objectSubId == 0))
- break;
-
- /*
- * 3. When recursing from anyplace else, transform this
- * deletion request into a delete of the other object.
- * (This will be an error condition iff RESTRICT mode.) In
- * this case we finish deleting my dependencies except for
- * the INTERNAL link, which will be needed to cause the
- * owning object to recurse back to me.
- */
- if (amOwned) /* shouldn't happen */
- elog(ERROR, "multiple INTERNAL dependencies for %s",
- objDescription);
- owningObject = otherObject;
- amOwned = true;
- /* "continue" bypasses the simple_heap_delete call below */
- continue;
+ subflags = DEPFLAG_INTERNAL;
+ break;
case DEPENDENCY_PIN:
/*
- * Should not happen; PIN dependencies should have zeroes
- * in the depender fields...
+ * For a PIN dependency we just ereport immediately; there
+ * won't be any others to report.
*/
- elog(ERROR, "incorrect use of PIN dependency with %s",
- objDescription);
+ ereport(ERROR,
+ (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
+ errmsg("cannot drop %s because it is required by the database system",
+ getObjectDescription(object))));
+ subflags = 0; /* keep compiler quiet */
break;
default:
elog(ERROR, "unrecognized dependency type '%c' for %s",
- foundDep->deptype, objDescription);
+ foundDep->deptype, getObjectDescription(object));
+ subflags = 0; /* keep compiler quiet */
break;
}
- simple_heap_delete(depRel, &tup->t_self);
+ findDependentObjects(&otherObject,
+ subflags,
+ &mystack,
+ targetObjects,
+ pendingObjects,
+ depRel);
}
systable_endscan(scan);
/*
- * CommandCounterIncrement here to ensure that preceding changes are
- * all visible; in particular, that the above deletions of pg_depend
- * entries are visible. That prevents infinite recursion in case of a
- * dependency loop (which is perfectly legal).
+ * Finally, we can add the target object to targetObjects. Be careful
+ * to include any flags that were passed back down to us from inner
+ * recursion levels.
*/
- CommandCounterIncrement();
+ extra.flags = mystack.flags;
+ if (stack)
+ extra.dependee = *stack->object;
+ else
+ memset(&extra.dependee, 0, sizeof(extra.dependee));
+ add_exact_object_address_extra(object, &extra, targetObjects);
+}
+
+/*
+ * reportDependentObjects - report about dependencies, and fail if RESTRICT
+ *
+ * Tell the user about dependent objects that we are going to delete
+ * (or would need to delete, but are prevented by RESTRICT mode);
+ * then error out if there are any and it's not CASCADE mode.
+ *
+ * targetObjects: list of objects that are scheduled to be deleted
+ * behavior: RESTRICT or CASCADE
+ * msglevel: elog level for non-error report messages
+ * origObject: base object of deletion, or NULL if not available
+ * (the latter case occurs in DROP OWNED)
+ */
+static void
+reportDependentObjects(const ObjectAddresses *targetObjects,
+ DropBehavior behavior,
+ int msglevel,
+ const ObjectAddress *origObject)
+{
+ bool ok = true;
+ StringInfoData clientdetail;
+ StringInfoData logdetail;
+ int numReportedClient = 0;
+ int numNotReportedClient = 0;
+ int i;
+
+ /*
+ * If no error is to be thrown, and the msglevel is too low to be shown
+ * to either client or server log, there's no need to do any of the work.
+ *
+ * Note: this code doesn't know all there is to be known about elog
+ * levels, but it works for NOTICE and DEBUG2, which are the only values
+ * msglevel can currently have. We also assume we are running in a normal
+ * operating environment.
+ */
+ if (behavior == DROP_CASCADE &&
+ msglevel < client_min_messages &&
+ (msglevel < log_min_messages || log_min_messages == LOG))
+ return;
/*
- * If we found we are owned by another object, ask it to delete itself
- * instead of proceeding. Complain if RESTRICT mode, unless the other
- * object is in oktodelete.
+ * We limit the number of dependencies reported to the client to
+ * MAX_REPORTED_DEPS, since client software may not deal well with
+ * enormous error strings. The server log always gets a full report.
*/
- if (amOwned)
+#define MAX_REPORTED_DEPS 100
+
+ initStringInfo(&clientdetail);
+ initStringInfo(&logdetail);
+
+ /*
+ * We process the list back to front (ie, in dependency order not deletion
+ * order), since this makes for a more understandable display.
+ */
+ for (i = targetObjects->numrefs - 1; i >= 0; i--)
{
- if (object_address_present(&owningObject, oktodelete))
+ const ObjectAddress *obj = &targetObjects->refs[i];
+ const ObjectAddressExtra *extra = &targetObjects->extras[i];
+ char *objDesc;
+
+ /* Ignore the original deletion target(s) */
+ if (extra->flags & DEPFLAG_ORIGINAL)
+ continue;
+
+ objDesc = getObjectDescription(obj);
+
+ /*
+ * If, at any stage of the recursive search, we reached the object
+ * via an AUTO or INTERNAL dependency, then it's okay to delete it
+ * even in RESTRICT mode.
+ */
+ if (extra->flags & (DEPFLAG_AUTO | DEPFLAG_INTERNAL))
+ {
+ /*
+ * auto-cascades are reported at DEBUG2, not msglevel. We
+ * don't try to combine them with the regular message because
+ * the results are too confusing when client_min_messages and
+ * log_min_messages are different.
+ */
ereport(DEBUG2,
(errmsg("drop auto-cascades to %s",
- getObjectDescription(&owningObject))));
+ objDesc)));
+ }
else if (behavior == DROP_RESTRICT)
{
- ereport(msglevel,
- (errmsg("%s depends on %s",
- getObjectDescription(&owningObject),
- objDescription)));
+ char *otherDesc = getObjectDescription(&extra->dependee);
+
+ if (numReportedClient < MAX_REPORTED_DEPS)
+ {
+ /* separate entries with a newline */
+ if (clientdetail.len != 0)
+ appendStringInfoChar(&clientdetail, '\n');
+ appendStringInfo(&clientdetail, _("%s depends on %s"),
+ objDesc, otherDesc);
+ numReportedClient++;
+ }
+ else
+ numNotReportedClient++;
+ /* separate entries with a newline */
+ if (logdetail.len != 0)
+ appendStringInfoChar(&logdetail, '\n');
+ appendStringInfo(&logdetail, _("%s depends on %s"),
+ objDesc, otherDesc);
+ pfree(otherDesc);
ok = false;
}
else
- ereport(msglevel,
- (errmsg("drop cascades to %s",
- getObjectDescription(&owningObject))));
-
- if (!recursiveDeletion(&owningObject, behavior, msglevel,
- object, oktodelete, depRel))
- ok = false;
-
- pfree(objDescription);
+ {
+ if (numReportedClient < MAX_REPORTED_DEPS)
+ {
+ /* separate entries with a newline */
+ if (clientdetail.len != 0)
+ appendStringInfoChar(&clientdetail, '\n');
+ appendStringInfo(&clientdetail, _("drop cascades to %s"),
+ objDesc);
+ numReportedClient++;
+ }
+ else
+ numNotReportedClient++;
+ /* separate entries with a newline */
+ if (logdetail.len != 0)
+ appendStringInfoChar(&logdetail, '\n');
+ appendStringInfo(&logdetail, _("drop cascades to %s"),
+ objDesc);
+ }
- return ok;
+ pfree(objDesc);
}
- /*
- * Step 2: scan pg_depend records that link to this object, showing
- * the things that depend on it. Recursively delete those things.
- * Note it's important to delete the dependent objects before the
- * referenced one, since the deletion routines might do things like
- * try to update the pg_class record when deleting a check constraint.
- */
- if (!deleteDependentObjects(object, objDescription,
- behavior, msglevel,
- oktodelete, depRel))
- ok = false;
-
- /*
- * We do not need CommandCounterIncrement here, since if step 2 did
- * anything then each recursive call will have ended with one.
- */
+ if (numNotReportedClient > 0)
+ appendStringInfo(&clientdetail, _("\nand %d other objects "
+ "(see server log for list)"),
+ numNotReportedClient);
- /*
- * Step 3: delete the object itself.
- */
- doDeletion(object);
-
- /*
- * Delete any comments associated with this object. (This is a
- * convenient place to do it instead of having every object type know
- * to do it.)
- */
- DeleteComments(object->objectId, object->classId, object->objectSubId);
-
- /*
- * CommandCounterIncrement here to ensure that preceding changes are
- * all visible.
- */
- CommandCounterIncrement();
-
- /*
- * And we're done!
- */
- pfree(objDescription);
+ if (!ok)
+ {
+ if (origObject)
+ ereport(ERROR,
+ (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
+ errmsg("cannot drop %s because other objects depend on it",
+ getObjectDescription(origObject)),
+ errdetail("%s", clientdetail.data),
+ errdetail_log("%s", logdetail.data),
+ errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
+ errmsg("cannot drop desired object(s) because other objects depend on them"),
+ errdetail("%s", clientdetail.data),
+ errdetail_log("%s", logdetail.data),
+ errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
+ }
+ else if (numReportedClient > 1)
+ {
+ ereport(msglevel,
+ /* translator: %d always has a value larger than 1 */
+ (errmsg("drop cascades to %d other objects",
+ numReportedClient + numNotReportedClient),
+ errdetail("%s", clientdetail.data),
+ errdetail_log("%s", logdetail.data)));
+ }
+ else if (numReportedClient == 1)
+ {
+ /* we just use the single item as-is */
+ ereport(msglevel,
+ (errmsg_internal("%s", clientdetail.data)));
+ }
- return ok;
+ pfree(clientdetail.data);
+ pfree(logdetail.data);
}
-
/*
- * deleteDependentObjects - find and delete objects that depend on 'object'
- *
- * Scan pg_depend records that link to the given object, showing
- * the things that depend on it. Recursively delete those things. (We
- * don't delete the pg_depend records here, as the recursive call will
- * do that.) Note it's important to delete the dependent objects
- * before the referenced one, since the deletion routines might do
- * things like try to update the pg_class record when deleting a check
- * constraint.
- *
- * When dropping a whole object (subId = 0), find pg_depend records for
- * its sub-objects too.
- *
- * object: the object to find dependencies on
- * objDescription: description of object (only used for error messages)
- * behavior: desired drop behavior
- * oktodelete: stuff that's AUTO-deletable
- * depRel: already opened pg_depend relation
- *
- * Returns TRUE if all is well, false if any problem found.
+ * deleteOneObject: delete a single object for performDeletion.
*
- * NOTE: because we are using SnapshotNow, if a recursive call deletes
- * any pg_depend tuples that our scan hasn't yet visited, we will not
- * see them as good when we do visit them. This is essential for
- * correct behavior if there are multiple dependency paths between two
- * objects --- else we might try to delete an already-deleted object.
+ * depRel is the already-open pg_depend relation.
*/
-static bool
-deleteDependentObjects(const ObjectAddress *object,
- const char *objDescription,
- DropBehavior behavior,
- int msglevel,
- ObjectAddresses *oktodelete,
- Relation depRel)
+static void
+deleteOneObject(const ObjectAddress *object, Relation depRel)
{
- bool ok = true;
ScanKeyData key[3];
int nkeys;
SysScanDesc scan;
HeapTuple tup;
- ObjectAddress otherObject;
+ /*
+ * First remove any pg_depend records that link from this object to
+ * others. (Any records linking to this object should be gone already.)
+ *
+ * When dropping a whole object (subId = 0), remove all pg_depend records
+ * for its sub-objects too.
+ */
ScanKeyInit(&key[0],
- Anum_pg_depend_refclassid,
+ Anum_pg_depend_classid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
- Anum_pg_depend_refobjid,
+ Anum_pg_depend_objid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
- Anum_pg_depend_refobjsubid,
+ Anum_pg_depend_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
else
nkeys = 2;
- scan = systable_beginscan(depRel, DependReferenceIndex, true,
+ scan = systable_beginscan(depRel, DependDependerIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
- Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
-
- otherObject.classId = foundDep->classid;
- otherObject.objectId = foundDep->objid;
- otherObject.objectSubId = foundDep->objsubid;
-
- switch (foundDep->deptype)
- {
- case DEPENDENCY_NORMAL:
-
- /*
- * Perhaps there was another dependency path that would
- * have allowed silent deletion of the otherObject, had we
- * only taken that path first. In that case, act like this
- * link is AUTO, too.
- */
- if (object_address_present(&otherObject, oktodelete))
- ereport(DEBUG2,
- (errmsg("drop auto-cascades to %s",
- getObjectDescription(&otherObject))));
- else if (behavior == DROP_RESTRICT)
- {
- ereport(msglevel,
- (errmsg("%s depends on %s",
- getObjectDescription(&otherObject),
- objDescription)));
- ok = false;
- }
- else
- ereport(msglevel,
- (errmsg("drop cascades to %s",
- getObjectDescription(&otherObject))));
+ simple_heap_delete(depRel, &tup->t_self);
+ }
- if (!recursiveDeletion(&otherObject, behavior, msglevel,
- object, oktodelete, depRel))
- ok = false;
- break;
- case DEPENDENCY_AUTO:
- case DEPENDENCY_INTERNAL:
+ systable_endscan(scan);
- /*
- * We propagate the DROP without complaint even in the
- * RESTRICT case. (However, normal dependencies on the
- * component object could still cause failure.)
- */
- ereport(DEBUG2,
- (errmsg("drop auto-cascades to %s",
- getObjectDescription(&otherObject))));
+ /*
+ * Now delete the object itself, in an object-type-dependent way.
+ */
+ doDeletion(object);
- if (!recursiveDeletion(&otherObject, behavior, msglevel,
- object, oktodelete, depRel))
- ok = false;
- break;
- case DEPENDENCY_PIN:
+ /*
+ * Delete any comments associated with this object. (This is a convenient
+ * place to do it instead of having every object type know to do it.)
+ */
+ DeleteComments(object->objectId, object->classId, object->objectSubId);
- /*
- * For a PIN dependency we just ereport immediately; there
- * won't be any others to report.
- */
- ereport(ERROR,
- (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
- errmsg("cannot drop %s because it is required by the database system",
- objDescription)));
- break;
- default:
- elog(ERROR, "unrecognized dependency type '%c' for %s",
- foundDep->deptype, objDescription);
- break;
- }
- }
+ /*
+ * Delete shared dependency references related to this object. Sub-objects
+ * (columns) don't have dependencies on global objects, so skip them.
+ */
+ if (object->objectSubId == 0)
+ deleteSharedDependencyRecordsFor(object->classId, object->objectId);
- systable_endscan(scan);
+ /*
+ * CommandCounterIncrement here to ensure that preceding changes are all
+ * visible to the next deletion step.
+ */
+ CommandCounterIncrement();
- return ok;
+ /*
+ * And we're done!
+ */
}
-
/*
* doDeletion: actually delete a single object
*/
RemoveOpClassById(object->objectId);
break;
+ case OCLASS_OPFAMILY:
+ RemoveOpFamilyById(object->objectId);
+ break;
+
+ case OCLASS_AMOP:
+ RemoveAmOpEntryById(object->objectId);
+ break;
+
+ case OCLASS_AMPROC:
+ RemoveAmProcEntryById(object->objectId);
+ break;
+
case OCLASS_REWRITE:
RemoveRewriteRuleById(object->objectId);
break;
RemoveSchemaById(object->objectId);
break;
+ case OCLASS_TSPARSER:
+ RemoveTSParserById(object->objectId);
+ break;
+
+ case OCLASS_TSDICT:
+ RemoveTSDictionaryById(object->objectId);
+ break;
+
+ case OCLASS_TSTEMPLATE:
+ RemoveTSTemplateById(object->objectId);
+ break;
+
+ case OCLASS_TSCONFIG:
+ RemoveTSConfigurationById(object->objectId);
+ break;
+
+ /* OCLASS_ROLE, OCLASS_DATABASE, OCLASS_TBLSPACE not handled */
+
default:
elog(ERROR, "unrecognized object class: %u",
object->classId);
}
}
+/*
+ * AcquireDeletionLock - acquire a suitable lock for deleting an object
+ *
+ * We use LockRelation for relations, LockDatabaseObject for everything
+ * else. Note that dependency.c is not concerned with deleting any kind of
+ * shared-across-databases object, so we have no need for LockSharedObject.
+ */
+static void
+AcquireDeletionLock(const ObjectAddress *object)
+{
+ if (object->classId == RelationRelationId)
+ LockRelationOid(object->objectId, AccessExclusiveLock);
+ else
+ /* assume we should lock the whole object not a sub-object */
+ LockDatabaseObject(object->classId, object->objectId, 0,
+ AccessExclusiveLock);
+}
+
+/*
+ * ReleaseDeletionLock - release an object deletion lock
+ */
+static void
+ReleaseDeletionLock(const ObjectAddress *object)
+{
+ if (object->classId == RelationRelationId)
+ UnlockRelationOid(object->objectId, AccessExclusiveLock);
+ else
+ /* assume we should lock the whole object not a sub-object */
+ UnlockDatabaseObject(object->classId, object->objectId, 0,
+ AccessExclusiveLock);
+}
+
/*
* recordDependencyOnExpr - find expression dependencies
*
*
* rtable is the rangetable to be used to interpret Vars with varlevelsup=0.
* It can be NIL if no such variables are expected.
- *
- * XXX is it important to create dependencies on the datatypes mentioned in
- * the expression? In most cases this would be redundant (eg, a ref to an
- * operator indirectly references its input and output datatypes), but I'm
- * not quite convinced there are no cases where we need it.
*/
void
recordDependencyOnExpr(const ObjectAddress *depender,
{
find_expr_references_context context;
- init_object_addresses(&context.addrs);
+ context.addrs = new_object_addresses();
/* Set up interpretation for Vars at varlevelsup = 0 */
context.rtables = list_make1(rtable);
find_expr_references_walker(expr, &context);
/* Remove any duplicates */
- eliminate_duplicate_dependencies(&context.addrs);
+ eliminate_duplicate_dependencies(context.addrs);
/* And record 'em */
recordMultipleDependencies(depender,
- context.addrs.refs, context.addrs.numrefs,
+ context.addrs->refs, context.addrs->numrefs,
behavior);
- term_object_addresses(&context.addrs);
+ free_object_addresses(context.addrs);
}
/*
find_expr_references_context context;
RangeTblEntry rte;
- init_object_addresses(&context.addrs);
+ context.addrs = new_object_addresses();
/* We gin up a rather bogus rangetable list to handle Vars */
MemSet(&rte, 0, sizeof(rte));
find_expr_references_walker(expr, &context);
/* Remove any duplicates */
- eliminate_duplicate_dependencies(&context.addrs);
+ eliminate_duplicate_dependencies(context.addrs);
/* Separate self-dependencies if necessary */
- if (behavior != self_behavior && context.addrs.numrefs > 0)
+ if (behavior != self_behavior && context.addrs->numrefs > 0)
{
- ObjectAddresses self_addrs;
+ ObjectAddresses *self_addrs;
ObjectAddress *outobj;
int oldref,
outrefs;
- init_object_addresses(&self_addrs);
+ self_addrs = new_object_addresses();
- outobj = context.addrs.refs;
+ outobj = context.addrs->refs;
outrefs = 0;
- for (oldref = 0; oldref < context.addrs.numrefs; oldref++)
+ for (oldref = 0; oldref < context.addrs->numrefs; oldref++)
{
- ObjectAddress *thisobj = context.addrs.refs + oldref;
+ ObjectAddress *thisobj = context.addrs->refs + oldref;
- if (thisobj->classId == RelOid_pg_class &&
+ if (thisobj->classId == RelationRelationId &&
thisobj->objectId == relId)
{
/* Move this ref into self_addrs */
- add_object_address(OCLASS_CLASS, relId, thisobj->objectSubId,
- &self_addrs);
+ add_exact_object_address(thisobj, self_addrs);
}
else
{
/* Keep it in context.addrs */
- outobj->classId = thisobj->classId;
- outobj->objectId = thisobj->objectId;
- outobj->objectSubId = thisobj->objectSubId;
+ *outobj = *thisobj;
outobj++;
outrefs++;
}
}
- context.addrs.numrefs = outrefs;
+ context.addrs->numrefs = outrefs;
/* Record the self-dependencies */
recordMultipleDependencies(depender,
- self_addrs.refs, self_addrs.numrefs,
+ self_addrs->refs, self_addrs->numrefs,
self_behavior);
- term_object_addresses(&self_addrs);
+ free_object_addresses(self_addrs);
}
/* Record the external dependencies */
recordMultipleDependencies(depender,
- context.addrs.refs, context.addrs.numrefs,
+ context.addrs->refs, context.addrs->numrefs,
behavior);
- term_object_addresses(&context.addrs);
+ free_object_addresses(context.addrs);
}
/*
* To do so, we do not scan the joinaliasvars list of a join RTE while
* scanning the query rangetable, but instead scan each individual entry
* of the alias list when we find a reference to it.
+ *
+ * Note: in many cases we do not need to create dependencies on the datatypes
+ * involved in an expression, because we'll have an indirect dependency via
+ * some other object. For instance Var nodes depend on a column which depends
+ * on the datatype, and OpExpr nodes depend on the operator which depends on
+ * the datatype. However we do need a type dependency if there is no such
+ * indirect dependency, as for example in Const and CoerceToDomain nodes.
*/
static bool
find_expr_references_walker(Node *node,
if (var->varno <= 0 || var->varno > list_length(rtable))
elog(ERROR, "invalid varno %d", var->varno);
rte = rt_fetch(var->varno, rtable);
+
/*
* A whole-row Var references no specific columns, so adds no new
* dependency.
{
/* If it's a plain relation, reference this column */
add_object_address(OCLASS_CLASS, rte->relid, var->varattno,
- &context->addrs);
+ context->addrs);
}
else if (rte->rtekind == RTE_JOIN)
{
}
return false;
}
+ if (IsA(node, Const))
+ {
+ Const *con = (Const *) node;
+ Oid objoid;
+
+ /* A constant must depend on the constant's datatype */
+ add_object_address(OCLASS_TYPE, con->consttype, 0,
+ context->addrs);
+
+ /*
+ * If it's a regclass or similar literal referring to an existing
+ * object, add a reference to that object. (Currently, only the
+ * regclass and regconfig cases have any likely use, but we may as
+ * well handle all the OID-alias datatypes consistently.)
+ */
+ if (!con->constisnull)
+ {
+ switch (con->consttype)
+ {
+ case REGPROCOID:
+ case REGPROCEDUREOID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(PROCOID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_PROC, objoid, 0,
+ context->addrs);
+ break;
+ case REGOPEROID:
+ case REGOPERATOROID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(OPEROID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_OPERATOR, objoid, 0,
+ context->addrs);
+ break;
+ case REGCLASSOID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(RELOID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_CLASS, objoid, 0,
+ context->addrs);
+ break;
+ case REGTYPEOID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(TYPEOID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_TYPE, objoid, 0,
+ context->addrs);
+ break;
+ case REGCONFIGOID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(TSCONFIGOID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_TSCONFIG, objoid, 0,
+ context->addrs);
+ break;
+ case REGDICTIONARYOID:
+ objoid = DatumGetObjectId(con->constvalue);
+ if (SearchSysCacheExists(TSDICTOID,
+ ObjectIdGetDatum(objoid),
+ 0, 0, 0))
+ add_object_address(OCLASS_TSDICT, objoid, 0,
+ context->addrs);
+ break;
+ }
+ }
+ return false;
+ }
+ if (IsA(node, Param))
+ {
+ Param *param = (Param *) node;
+
+ /* A parameter must depend on the parameter's datatype */
+ add_object_address(OCLASS_TYPE, param->paramtype, 0,
+ context->addrs);
+ }
if (IsA(node, FuncExpr))
{
FuncExpr *funcexpr = (FuncExpr *) node;
add_object_address(OCLASS_PROC, funcexpr->funcid, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
if (IsA(node, OpExpr))
OpExpr *opexpr = (OpExpr *) node;
add_object_address(OCLASS_OPERATOR, opexpr->opno, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
if (IsA(node, DistinctExpr))
DistinctExpr *distinctexpr = (DistinctExpr *) node;
add_object_address(OCLASS_OPERATOR, distinctexpr->opno, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
if (IsA(node, ScalarArrayOpExpr))
ScalarArrayOpExpr *opexpr = (ScalarArrayOpExpr *) node;
add_object_address(OCLASS_OPERATOR, opexpr->opno, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
if (IsA(node, NullIfExpr))
NullIfExpr *nullifexpr = (NullIfExpr *) node;
add_object_address(OCLASS_OPERATOR, nullifexpr->opno, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
if (IsA(node, Aggref))
Aggref *aggref = (Aggref *) node;
add_object_address(OCLASS_PROC, aggref->aggfnoid, 0,
- &context->addrs);
+ context->addrs);
/* fall through to examine arguments */
}
- if (IsA(node, SubLink))
+ if (is_subplan(node))
+ {
+ /* Extra work needed here if we ever need this case */
+ elog(ERROR, "already-planned subqueries not supported");
+ }
+ if (IsA(node, RelabelType))
{
- SubLink *sublink = (SubLink *) node;
- ListCell *opid;
+ RelabelType *relab = (RelabelType *) node;
- foreach(opid, sublink->operOids)
+ /* since there is no function dependency, need to depend on type */
+ add_object_address(OCLASS_TYPE, relab->resulttype, 0,
+ context->addrs);
+ }
+ if (IsA(node, CoerceViaIO))
+ {
+ CoerceViaIO *iocoerce = (CoerceViaIO *) node;
+
+ /* since there is no exposed function, need to depend on type */
+ add_object_address(OCLASS_TYPE, iocoerce->resulttype, 0,
+ context->addrs);
+ }
+ if (IsA(node, ArrayCoerceExpr))
+ {
+ ArrayCoerceExpr *acoerce = (ArrayCoerceExpr *) node;
+
+ if (OidIsValid(acoerce->elemfuncid))
+ add_object_address(OCLASS_PROC, acoerce->elemfuncid, 0,
+ context->addrs);
+ add_object_address(OCLASS_TYPE, acoerce->resulttype, 0,
+ context->addrs);
+ /* fall through to examine arguments */
+ }
+ if (IsA(node, ConvertRowtypeExpr))
+ {
+ ConvertRowtypeExpr *cvt = (ConvertRowtypeExpr *) node;
+
+ /* since there is no function dependency, need to depend on type */
+ add_object_address(OCLASS_TYPE, cvt->resulttype, 0,
+ context->addrs);
+ }
+ if (IsA(node, RowExpr))
+ {
+ RowExpr *rowexpr = (RowExpr *) node;
+
+ add_object_address(OCLASS_TYPE, rowexpr->row_typeid, 0,
+ context->addrs);
+ }
+ if (IsA(node, RowCompareExpr))
+ {
+ RowCompareExpr *rcexpr = (RowCompareExpr *) node;
+ ListCell *l;
+
+ foreach(l, rcexpr->opnos)
{
- add_object_address(OCLASS_OPERATOR, lfirst_oid(opid), 0,
- &context->addrs);
+ add_object_address(OCLASS_OPERATOR, lfirst_oid(l), 0,
+ context->addrs);
+ }
+ foreach(l, rcexpr->opfamilies)
+ {
+ add_object_address(OCLASS_OPFAMILY, lfirst_oid(l), 0,
+ context->addrs);
}
/* fall through to examine arguments */
}
- if (is_subplan(node))
+ if (IsA(node, CoerceToDomain))
{
- /* Extra work needed here if we ever need this case */
- elog(ERROR, "already-planned subqueries not supported");
+ CoerceToDomain *cd = (CoerceToDomain *) node;
+
+ add_object_address(OCLASS_TYPE, cd->resulttype, 0,
+ context->addrs);
}
if (IsA(node, Query))
{
bool result;
/*
- * Add whole-relation refs for each plain relation mentioned in
- * the subquery's rtable. (Note: query_tree_walker takes care of
- * recursing into RTE_FUNCTION and RTE_SUBQUERY RTEs, so no need
- * to do that here. But keep it from looking at join alias
- * lists.)
+ * Add whole-relation refs for each plain relation mentioned in the
+ * subquery's rtable, as well as datatype refs for any datatypes used
+ * as a RECORD function's output. (Note: query_tree_walker takes care
+ * of recursing into RTE_FUNCTION and RTE_SUBQUERY RTEs, so no need to
+ * do that here. But keep it from looking at join alias lists.)
*/
foreach(rtable, query->rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rtable);
+ ListCell *ct;
- if (rte->rtekind == RTE_RELATION)
- add_object_address(OCLASS_CLASS, rte->relid, 0,
- &context->addrs);
+ switch (rte->rtekind)
+ {
+ case RTE_RELATION:
+ add_object_address(OCLASS_CLASS, rte->relid, 0,
+ context->addrs);
+ break;
+ case RTE_FUNCTION:
+ foreach(ct, rte->funccoltypes)
+ {
+ add_object_address(OCLASS_TYPE, lfirst_oid(ct), 0,
+ context->addrs);
+ }
+ break;
+ default:
+ break;
+ }
}
/* Examine substructure of query */
int oldref,
newrefs;
+ /*
+ * We can't sort if the array has "extra" data, because there's no way
+ * to keep it in sync. Fortunately that combination of features is
+ * not needed.
+ */
+ Assert(!addrs->extras);
+
if (addrs->numrefs <= 1)
return; /* nothing to do */
continue; /* identical, so drop thisobj */
/*
- * If we have a whole-object reference and a reference to a
- * part of the same object, we don't need the whole-object
- * reference (for example, we don't need to reference both
- * table foo and column foo.bar). The whole-object reference
- * will always appear first in the sorted list.
+ * If we have a whole-object reference and a reference to a part
+ * of the same object, we don't need the whole-object reference
+ * (for example, we don't need to reference both table foo and
+ * column foo.bar). The whole-object reference will always appear
+ * first in the sorted list.
*/
if (priorobj->objectSubId == 0)
{
}
/* Not identical, so add thisobj to output set */
priorobj++;
- priorobj->classId = thisobj->classId;
- priorobj->objectId = thisobj->objectId;
- priorobj->objectSubId = thisobj->objectSubId;
+ *priorobj = *thisobj;
newrefs++;
}
/*
* Routines for handling an expansible array of ObjectAddress items.
*
- * init_object_addresses: initialize an ObjectAddresses array.
+ * new_object_addresses: create a new ObjectAddresses array.
*/
-static void
-init_object_addresses(ObjectAddresses *addrs)
+ObjectAddresses *
+new_object_addresses(void)
{
- /* Initialize array to empty */
+ ObjectAddresses *addrs;
+
+ addrs = palloc(sizeof(ObjectAddresses));
+
addrs->numrefs = 0;
- addrs->maxrefs = 32; /* arbitrary initial array size */
+ addrs->maxrefs = 32;
addrs->refs = (ObjectAddress *)
palloc(addrs->maxrefs * sizeof(ObjectAddress));
+ addrs->extras = NULL; /* until/unless needed */
- /* Initialize object_classes[] if not done yet */
- /* This will be needed by add_object_address() */
- if (!object_classes_initialized)
- init_object_classes();
+ return addrs;
}
/*
addrs->maxrefs *= 2;
addrs->refs = (ObjectAddress *)
repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
+ Assert(!addrs->extras);
}
/* record this item */
item = addrs->refs + addrs->numrefs;
*
* As above, but specify entry exactly.
*/
-static void
+void
add_exact_object_address(const ObjectAddress *object,
ObjectAddresses *addrs)
{
addrs->maxrefs *= 2;
addrs->refs = (ObjectAddress *)
repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
+ Assert(!addrs->extras);
+ }
+ /* record this item */
+ item = addrs->refs + addrs->numrefs;
+ *item = *object;
+ addrs->numrefs++;
+}
+
+/*
+ * Add an entry to an ObjectAddresses array.
+ *
+ * As above, but specify entry exactly and provide some "extra" data too.
+ */
+static void
+add_exact_object_address_extra(const ObjectAddress *object,
+ const ObjectAddressExtra *extra,
+ ObjectAddresses *addrs)
+{
+ ObjectAddress *item;
+ ObjectAddressExtra *itemextra;
+
+ /* allocate extra space if first time */
+ if (!addrs->extras)
+ addrs->extras = (ObjectAddressExtra *)
+ palloc(addrs->maxrefs * sizeof(ObjectAddressExtra));
+
+ /* enlarge array if needed */
+ if (addrs->numrefs >= addrs->maxrefs)
+ {
+ addrs->maxrefs *= 2;
+ addrs->refs = (ObjectAddress *)
+ repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
+ addrs->extras = (ObjectAddressExtra *)
+ repalloc(addrs->extras, addrs->maxrefs * sizeof(ObjectAddressExtra));
}
/* record this item */
item = addrs->refs + addrs->numrefs;
*item = *object;
+ itemextra = addrs->extras + addrs->numrefs;
+ *itemextra = *extra;
addrs->numrefs++;
}
*
* We return "true" if object is a subobject of something in the array, too.
*/
-static bool
+bool
object_address_present(const ObjectAddress *object,
- ObjectAddresses *addrs)
+ const ObjectAddresses *addrs)
{
int i;
for (i = addrs->numrefs - 1; i >= 0; i--)
{
- ObjectAddress *thisobj = addrs->refs + i;
+ const ObjectAddress *thisobj = addrs->refs + i;
if (object->classId == thisobj->classId &&
object->objectId == thisobj->objectId)
}
/*
- * Clean up when done with an ObjectAddresses array.
+ * As above, except that if the object is present then also OR the given
+ * flags into its associated extra data (which must exist).
*/
-static void
-term_object_addresses(ObjectAddresses *addrs)
+static bool
+object_address_present_add_flags(const ObjectAddress *object,
+ int flags,
+ ObjectAddresses *addrs)
{
- pfree(addrs->refs);
+ int i;
+
+ for (i = addrs->numrefs - 1; i >= 0; i--)
+ {
+ ObjectAddress *thisobj = addrs->refs + i;
+
+ if (object->classId == thisobj->classId &&
+ object->objectId == thisobj->objectId)
+ {
+ if (object->objectSubId == thisobj->objectSubId)
+ {
+ ObjectAddressExtra *thisextra = addrs->extras + i;
+
+ thisextra->flags |= flags;
+ return true;
+ }
+ if (thisobj->objectSubId == 0)
+ {
+ /*
+ * We get here if we find a need to delete a column after
+ * having already decided to drop its whole table. Obviously
+ * we no longer need to drop the column. But don't plaster
+ * its flags on the table.
+ */
+ return true;
+ }
+ }
+ }
+
+ return false;
}
/*
- * Initialize the object_classes[] table.
- *
- * Although some of these OIDs aren't compile-time constants, they surely
- * shouldn't change during a backend's run. So, we look them up the
- * first time through and then cache them.
+ * Record multiple dependencies from an ObjectAddresses array, after first
+ * removing any duplicates.
*/
-static void
-init_object_classes(void)
+void
+record_object_address_dependencies(const ObjectAddress *depender,
+ ObjectAddresses *referenced,
+ DependencyType behavior)
+{
+ eliminate_duplicate_dependencies(referenced);
+ recordMultipleDependencies(depender,
+ referenced->refs, referenced->numrefs,
+ behavior);
+}
+
+/*
+ * Clean up when done with an ObjectAddresses array.
+ */
+void
+free_object_addresses(ObjectAddresses *addrs)
{
- object_classes[OCLASS_CLASS] = RelOid_pg_class;
- object_classes[OCLASS_PROC] = RelOid_pg_proc;
- object_classes[OCLASS_TYPE] = RelOid_pg_type;
- object_classes[OCLASS_CAST] = get_system_catalog_relid(CastRelationName);
- object_classes[OCLASS_CONSTRAINT] = get_system_catalog_relid(ConstraintRelationName);
- object_classes[OCLASS_CONVERSION] = get_system_catalog_relid(ConversionRelationName);
- object_classes[OCLASS_DEFAULT] = get_system_catalog_relid(AttrDefaultRelationName);
- object_classes[OCLASS_LANGUAGE] = get_system_catalog_relid(LanguageRelationName);
- object_classes[OCLASS_OPERATOR] = get_system_catalog_relid(OperatorRelationName);
- object_classes[OCLASS_OPCLASS] = get_system_catalog_relid(OperatorClassRelationName);
- object_classes[OCLASS_REWRITE] = get_system_catalog_relid(RewriteRelationName);
- object_classes[OCLASS_TRIGGER] = get_system_catalog_relid(TriggerRelationName);
- object_classes[OCLASS_SCHEMA] = get_system_catalog_relid(NamespaceRelationName);
- object_classes_initialized = true;
+ pfree(addrs->refs);
+ if (addrs->extras)
+ pfree(addrs->extras);
+ pfree(addrs);
}
/*
* Determine the class of a given object identified by objectAddress.
*
- * This function is needed just because some of the system catalogs do
- * not have hardwired-at-compile-time OIDs.
+ * This function is essentially the reverse mapping for the object_classes[]
+ * table. We implement it as a function because the OIDs aren't consecutive.
*/
ObjectClass
getObjectClass(const ObjectAddress *object)
{
- /* Easy for the bootstrapped catalogs... */
switch (object->classId)
{
- case RelOid_pg_class:
+ case RelationRelationId:
/* caller must check objectSubId */
return OCLASS_CLASS;
- case RelOid_pg_proc:
+ case ProcedureRelationId:
Assert(object->objectSubId == 0);
return OCLASS_PROC;
- case RelOid_pg_type:
+ case TypeRelationId:
Assert(object->objectSubId == 0);
return OCLASS_TYPE;
- }
- /*
- * Handle cases where catalog's OID is not hardwired.
- */
- if (!object_classes_initialized)
- init_object_classes();
+ case CastRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_CAST;
- if (object->classId == object_classes[OCLASS_CAST])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_CAST;
- }
- if (object->classId == object_classes[OCLASS_CONSTRAINT])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_CONSTRAINT;
- }
- if (object->classId == object_classes[OCLASS_CONVERSION])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_CONVERSION;
- }
- if (object->classId == object_classes[OCLASS_DEFAULT])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_DEFAULT;
- }
- if (object->classId == object_classes[OCLASS_LANGUAGE])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_LANGUAGE;
- }
- if (object->classId == object_classes[OCLASS_OPERATOR])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_OPERATOR;
- }
- if (object->classId == object_classes[OCLASS_OPCLASS])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_OPCLASS;
- }
- if (object->classId == object_classes[OCLASS_REWRITE])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_REWRITE;
- }
- if (object->classId == object_classes[OCLASS_TRIGGER])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_TRIGGER;
- }
- if (object->classId == object_classes[OCLASS_SCHEMA])
- {
- Assert(object->objectSubId == 0);
- return OCLASS_SCHEMA;
+ case ConstraintRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_CONSTRAINT;
+
+ case ConversionRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_CONVERSION;
+
+ case AttrDefaultRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_DEFAULT;
+
+ case LanguageRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_LANGUAGE;
+
+ case OperatorRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_OPERATOR;
+
+ case OperatorClassRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_OPCLASS;
+
+ case OperatorFamilyRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_OPFAMILY;
+
+ case AccessMethodOperatorRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_AMOP;
+
+ case AccessMethodProcedureRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_AMPROC;
+
+ case RewriteRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_REWRITE;
+
+ case TriggerRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TRIGGER;
+
+ case NamespaceRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_SCHEMA;
+
+ case TSParserRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TSPARSER;
+
+ case TSDictionaryRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TSDICT;
+
+ case TSTemplateRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TSTEMPLATE;
+
+ case TSConfigRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TSCONFIG;
+
+ case AuthIdRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_ROLE;
+
+ case DatabaseRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_DATABASE;
+
+ case TableSpaceRelationId:
+ Assert(object->objectSubId == 0);
+ return OCLASS_TBLSPACE;
}
+ /* shouldn't get here */
elog(ERROR, "unrecognized object class: %u", object->classId);
return OCLASS_CLASS; /* keep compiler quiet */
}
case OCLASS_CLASS:
getRelationDescription(&buffer, object->objectId);
if (object->objectSubId != 0)
- appendStringInfo(&buffer, gettext(" column %s"),
+ appendStringInfo(&buffer, _(" column %s"),
get_relid_attribute_name(object->objectId,
- object->objectSubId));
+ object->objectSubId));
break;
case OCLASS_PROC:
- appendStringInfo(&buffer, gettext("function %s"),
+ appendStringInfo(&buffer, _("function %s"),
format_procedure(object->objectId));
break;
case OCLASS_TYPE:
- appendStringInfo(&buffer, gettext("type %s"),
+ appendStringInfo(&buffer, _("type %s"),
format_type_be(object->objectId));
break;
HeapTuple tup;
Form_pg_cast castForm;
- castDesc = heap_openr(CastRelationName, AccessShareLock);
+ castDesc = heap_open(CastRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
- rcscan = systable_beginscan(castDesc, CastOidIndex, true,
+ rcscan = systable_beginscan(castDesc, CastOidIndexId, true,
SnapshotNow, 1, skey);
tup = systable_getnext(rcscan);
castForm = (Form_pg_cast) GETSTRUCT(tup);
- appendStringInfo(&buffer, gettext("cast from %s to %s"),
+ appendStringInfo(&buffer, _("cast from %s to %s"),
format_type_be(castForm->castsource),
format_type_be(castForm->casttarget));
case OCLASS_CONSTRAINT:
{
- Relation conDesc;
- ScanKeyData skey[1];
- SysScanDesc rcscan;
- HeapTuple tup;
+ HeapTuple conTup;
Form_pg_constraint con;
- conDesc = heap_openr(ConstraintRelationName, AccessShareLock);
-
- ScanKeyInit(&skey[0],
- ObjectIdAttributeNumber,
- BTEqualStrategyNumber, F_OIDEQ,
- ObjectIdGetDatum(object->objectId));
-
- rcscan = systable_beginscan(conDesc, ConstraintOidIndex, true,
- SnapshotNow, 1, skey);
-
- tup = systable_getnext(rcscan);
-
- if (!HeapTupleIsValid(tup))
- elog(ERROR, "could not find tuple for constraint %u",
+ conTup = SearchSysCache(CONSTROID,
+ ObjectIdGetDatum(object->objectId),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(conTup))
+ elog(ERROR, "cache lookup failed for constraint %u",
object->objectId);
-
- con = (Form_pg_constraint) GETSTRUCT(tup);
+ con = (Form_pg_constraint) GETSTRUCT(conTup);
if (OidIsValid(con->conrelid))
{
- appendStringInfo(&buffer, gettext("constraint %s on "),
+ appendStringInfo(&buffer, _("constraint %s on "),
NameStr(con->conname));
getRelationDescription(&buffer, con->conrelid);
}
else
{
- appendStringInfo(&buffer, gettext("constraint %s"),
+ appendStringInfo(&buffer, _("constraint %s"),
NameStr(con->conname));
}
- systable_endscan(rcscan);
- heap_close(conDesc, AccessShareLock);
+ ReleaseSysCache(conTup);
break;
}
{
HeapTuple conTup;
- conTup = SearchSysCache(CONOID,
- ObjectIdGetDatum(object->objectId),
+ conTup = SearchSysCache(CONVOID,
+ ObjectIdGetDatum(object->objectId),
0, 0, 0);
if (!HeapTupleIsValid(conTup))
elog(ERROR, "cache lookup failed for conversion %u",
object->objectId);
- appendStringInfo(&buffer, gettext("conversion %s"),
- NameStr(((Form_pg_conversion) GETSTRUCT(conTup))->conname));
+ appendStringInfo(&buffer, _("conversion %s"),
+ NameStr(((Form_pg_conversion) GETSTRUCT(conTup))->conname));
ReleaseSysCache(conTup);
break;
}
Form_pg_attrdef attrdef;
ObjectAddress colobject;
- attrdefDesc = heap_openr(AttrDefaultRelationName, AccessShareLock);
+ attrdefDesc = heap_open(AttrDefaultRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
- adscan = systable_beginscan(attrdefDesc, AttrDefaultOidIndex,
+ adscan = systable_beginscan(attrdefDesc, AttrDefaultOidIndexId,
true, SnapshotNow, 1, skey);
tup = systable_getnext(adscan);
attrdef = (Form_pg_attrdef) GETSTRUCT(tup);
- colobject.classId = RelOid_pg_class;
+ colobject.classId = RelationRelationId;
colobject.objectId = attrdef->adrelid;
colobject.objectSubId = attrdef->adnum;
- appendStringInfo(&buffer, gettext("default for %s"),
+ appendStringInfo(&buffer, _("default for %s"),
getObjectDescription(&colobject));
systable_endscan(adscan);
HeapTuple langTup;
langTup = SearchSysCache(LANGOID,
- ObjectIdGetDatum(object->objectId),
+ ObjectIdGetDatum(object->objectId),
0, 0, 0);
if (!HeapTupleIsValid(langTup))
elog(ERROR, "cache lookup failed for language %u",
object->objectId);
- appendStringInfo(&buffer, gettext("language %s"),
- NameStr(((Form_pg_language) GETSTRUCT(langTup))->lanname));
+ appendStringInfo(&buffer, _("language %s"),
+ NameStr(((Form_pg_language) GETSTRUCT(langTup))->lanname));
ReleaseSysCache(langTup);
break;
}
case OCLASS_OPERATOR:
- appendStringInfo(&buffer, gettext("operator %s"),
+ appendStringInfo(&buffer, _("operator %s"),
format_operator(object->objectId));
break;
char *nspname;
opcTup = SearchSysCache(CLAOID,
- ObjectIdGetDatum(object->objectId),
+ ObjectIdGetDatum(object->objectId),
0, 0, 0);
if (!HeapTupleIsValid(opcTup))
elog(ERROR, "cache lookup failed for opclass %u",
opcForm = (Form_pg_opclass) GETSTRUCT(opcTup);
amTup = SearchSysCache(AMOID,
- ObjectIdGetDatum(opcForm->opcamid),
+ ObjectIdGetDatum(opcForm->opcmethod),
0, 0, 0);
if (!HeapTupleIsValid(amTup))
elog(ERROR, "cache lookup failed for access method %u",
- opcForm->opcamid);
+ opcForm->opcmethod);
amForm = (Form_pg_am) GETSTRUCT(amTup);
/* Qualify the name if not visible in search path */
else
nspname = get_namespace_name(opcForm->opcnamespace);
- appendStringInfo(&buffer, gettext("operator class %s for %s"),
+ appendStringInfo(&buffer, _("operator class %s for access method %s"),
quote_qualified_identifier(nspname,
- NameStr(opcForm->opcname)),
+ NameStr(opcForm->opcname)),
NameStr(amForm->amname));
ReleaseSysCache(amTup);
break;
}
+ case OCLASS_OPFAMILY:
+ getOpFamilyDescription(&buffer, object->objectId);
+ break;
+
+ case OCLASS_AMOP:
+ {
+ Relation amopDesc;
+ ScanKeyData skey[1];
+ SysScanDesc amscan;
+ HeapTuple tup;
+ Form_pg_amop amopForm;
+ StringInfoData opfam;
+
+ amopDesc = heap_open(AccessMethodOperatorRelationId,
+ AccessShareLock);
+
+ ScanKeyInit(&skey[0],
+ ObjectIdAttributeNumber,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(object->objectId));
+
+ amscan = systable_beginscan(amopDesc, AccessMethodOperatorOidIndexId, true,
+ SnapshotNow, 1, skey);
+
+ tup = systable_getnext(amscan);
+
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "could not find tuple for amop entry %u",
+ object->objectId);
+
+ amopForm = (Form_pg_amop) GETSTRUCT(tup);
+
+ initStringInfo(&opfam);
+ getOpFamilyDescription(&opfam, amopForm->amopfamily);
+ /*
+ * translator: %d is the operator strategy (a number), the
+ * first %s is the textual form of the operator, and the second
+ * %s is the description of the operator family.
+ */
+ appendStringInfo(&buffer, _("operator %d %s of %s"),
+ amopForm->amopstrategy,
+ format_operator(amopForm->amopopr),
+ opfam.data);
+ pfree(opfam.data);
+
+ systable_endscan(amscan);
+ heap_close(amopDesc, AccessShareLock);
+ break;
+ }
+
+ case OCLASS_AMPROC:
+ {
+ Relation amprocDesc;
+ ScanKeyData skey[1];
+ SysScanDesc amscan;
+ HeapTuple tup;
+ Form_pg_amproc amprocForm;
+ StringInfoData opfam;
+
+ amprocDesc = heap_open(AccessMethodProcedureRelationId,
+ AccessShareLock);
+
+ ScanKeyInit(&skey[0],
+ ObjectIdAttributeNumber,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(object->objectId));
+
+ amscan = systable_beginscan(amprocDesc, AccessMethodProcedureOidIndexId, true,
+ SnapshotNow, 1, skey);
+
+ tup = systable_getnext(amscan);
+
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "could not find tuple for amproc entry %u",
+ object->objectId);
+
+ amprocForm = (Form_pg_amproc) GETSTRUCT(tup);
+
+ initStringInfo(&opfam);
+ getOpFamilyDescription(&opfam, amprocForm->amprocfamily);
+ /*
+ * translator: %d is the function number, the first %s is the
+ * textual form of the function with arguments, and the second
+ * %s is the description of the operator family.
+ */
+ appendStringInfo(&buffer, _("function %d %s of %s"),
+ amprocForm->amprocnum,
+ format_procedure(amprocForm->amproc),
+ opfam.data);
+ pfree(opfam.data);
+
+ systable_endscan(amscan);
+ heap_close(amprocDesc, AccessShareLock);
+ break;
+ }
+
case OCLASS_REWRITE:
{
Relation ruleDesc;
HeapTuple tup;
Form_pg_rewrite rule;
- ruleDesc = heap_openr(RewriteRelationName, AccessShareLock);
+ ruleDesc = heap_open(RewriteRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
- rcscan = systable_beginscan(ruleDesc, RewriteOidIndex, true,
+ rcscan = systable_beginscan(ruleDesc, RewriteOidIndexId, true,
SnapshotNow, 1, skey);
tup = systable_getnext(rcscan);
rule = (Form_pg_rewrite) GETSTRUCT(tup);
- appendStringInfo(&buffer, gettext("rule %s on "),
+ appendStringInfo(&buffer, _("rule %s on "),
NameStr(rule->rulename));
getRelationDescription(&buffer, rule->ev_class);
HeapTuple tup;
Form_pg_trigger trig;
- trigDesc = heap_openr(TriggerRelationName, AccessShareLock);
+ trigDesc = heap_open(TriggerRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
- tgscan = systable_beginscan(trigDesc, TriggerOidIndex, true,
+ tgscan = systable_beginscan(trigDesc, TriggerOidIndexId, true,
SnapshotNow, 1, skey);
tup = systable_getnext(tgscan);
trig = (Form_pg_trigger) GETSTRUCT(tup);
- appendStringInfo(&buffer, gettext("trigger %s on "),
+ appendStringInfo(&buffer, _("trigger %s on "),
NameStr(trig->tgname));
getRelationDescription(&buffer, trig->tgrelid);
if (!nspname)
elog(ERROR, "cache lookup failed for namespace %u",
object->objectId);
- appendStringInfo(&buffer, gettext("schema %s"), nspname);
+ appendStringInfo(&buffer, _("schema %s"), nspname);
+ break;
+ }
+
+ case OCLASS_TSPARSER:
+ {
+ HeapTuple tup;
+
+ tup = SearchSysCache(TSPARSEROID,
+ ObjectIdGetDatum(object->objectId),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "cache lookup failed for text search parser %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("text search parser %s"),
+ NameStr(((Form_pg_ts_parser) GETSTRUCT(tup))->prsname));
+ ReleaseSysCache(tup);
+ break;
+ }
+
+ case OCLASS_TSDICT:
+ {
+ HeapTuple tup;
+
+ tup = SearchSysCache(TSDICTOID,
+ ObjectIdGetDatum(object->objectId),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "cache lookup failed for text search dictionary %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("text search dictionary %s"),
+ NameStr(((Form_pg_ts_dict) GETSTRUCT(tup))->dictname));
+ ReleaseSysCache(tup);
+ break;
+ }
+
+ case OCLASS_TSTEMPLATE:
+ {
+ HeapTuple tup;
+
+ tup = SearchSysCache(TSTEMPLATEOID,
+ ObjectIdGetDatum(object->objectId),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "cache lookup failed for text search template %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("text search template %s"),
+ NameStr(((Form_pg_ts_template) GETSTRUCT(tup))->tmplname));
+ ReleaseSysCache(tup);
+ break;
+ }
+
+ case OCLASS_TSCONFIG:
+ {
+ HeapTuple tup;
+
+ tup = SearchSysCache(TSCONFIGOID,
+ ObjectIdGetDatum(object->objectId),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(tup))
+ elog(ERROR, "cache lookup failed for text search configuration %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("text search configuration %s"),
+ NameStr(((Form_pg_ts_config) GETSTRUCT(tup))->cfgname));
+ ReleaseSysCache(tup);
+ break;
+ }
+
+ case OCLASS_ROLE:
+ {
+ appendStringInfo(&buffer, _("role %s"),
+ GetUserNameFromId(object->objectId));
+ break;
+ }
+
+ case OCLASS_DATABASE:
+ {
+ char *datname;
+
+ datname = get_database_name(object->objectId);
+ if (!datname)
+ elog(ERROR, "cache lookup failed for database %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("database %s"), datname);
+ break;
+ }
+
+ case OCLASS_TBLSPACE:
+ {
+ char *tblspace;
+
+ tblspace = get_tablespace_name(object->objectId);
+ if (!tblspace)
+ elog(ERROR, "cache lookup failed for tablespace %u",
+ object->objectId);
+ appendStringInfo(&buffer, _("tablespace %s"), tblspace);
break;
}
switch (relForm->relkind)
{
case RELKIND_RELATION:
- appendStringInfo(buffer, gettext("table %s"),
+ appendStringInfo(buffer, _("table %s"),
relname);
break;
case RELKIND_INDEX:
- appendStringInfo(buffer, gettext("index %s"),
- relname);
- break;
- case RELKIND_SPECIAL:
- appendStringInfo(buffer, gettext("special system relation %s"),
+ appendStringInfo(buffer, _("index %s"),
relname);
break;
case RELKIND_SEQUENCE:
- appendStringInfo(buffer, gettext("sequence %s"),
+ appendStringInfo(buffer, _("sequence %s"),
relname);
break;
case RELKIND_UNCATALOGED:
- appendStringInfo(buffer, gettext("uncataloged table %s"),
+ appendStringInfo(buffer, _("uncataloged table %s"),
relname);
break;
case RELKIND_TOASTVALUE:
- appendStringInfo(buffer, gettext("toast table %s"),
+ appendStringInfo(buffer, _("toast table %s"),
relname);
break;
case RELKIND_VIEW:
- appendStringInfo(buffer, gettext("view %s"),
+ appendStringInfo(buffer, _("view %s"),
relname);
break;
case RELKIND_COMPOSITE_TYPE:
- appendStringInfo(buffer, gettext("composite type %s"),
+ appendStringInfo(buffer, _("composite type %s"),
relname);
break;
default:
/* shouldn't get here */
- appendStringInfo(buffer, gettext("relation %s"),
+ appendStringInfo(buffer, _("relation %s"),
relname);
break;
}
ReleaseSysCache(relTup);
}
+
+/*
+ * subroutine for getObjectDescription: describe an operator family
+ */
+static void
+getOpFamilyDescription(StringInfo buffer, Oid opfid)
+{
+ HeapTuple opfTup;
+ Form_pg_opfamily opfForm;
+ HeapTuple amTup;
+ Form_pg_am amForm;
+ char *nspname;
+
+ opfTup = SearchSysCache(OPFAMILYOID,
+ ObjectIdGetDatum(opfid),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(opfTup))
+ elog(ERROR, "cache lookup failed for opfamily %u", opfid);
+ opfForm = (Form_pg_opfamily) GETSTRUCT(opfTup);
+
+ amTup = SearchSysCache(AMOID,
+ ObjectIdGetDatum(opfForm->opfmethod),
+ 0, 0, 0);
+ if (!HeapTupleIsValid(amTup))
+ elog(ERROR, "cache lookup failed for access method %u",
+ opfForm->opfmethod);
+ amForm = (Form_pg_am) GETSTRUCT(amTup);
+
+ /* Qualify the name if not visible in search path */
+ if (OpfamilyIsVisible(opfid))
+ nspname = NULL;
+ else
+ nspname = get_namespace_name(opfForm->opfnamespace);
+
+ appendStringInfo(buffer, _("operator family %s for access method %s"),
+ quote_qualified_identifier(nspname,
+ NameStr(opfForm->opfname)),
+ NameStr(amForm->amname));
+
+ ReleaseSysCache(amTup);
+ ReleaseSysCache(opfTup);
+}
projects / postgresql / blobdiff