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Add unique index on pg_cast.oid, and document pg_cast table.

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This commit is contained in:
Peter Eisentraut
2002-07-22 20:23:19 +00:00
parent a7ffd69d4c
commit e9c013f4bd
4 changed files with 86 additions and 15 deletions
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25
src/backend/commands/functioncmds.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.11 2002/07/20 05:37:45 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.12 2002/07/22 20:23:19 petere Exp $
*
* DESCRIPTION
* These routines take the parse tree and pick out the
@ -31,6 +31,7 @@
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/dependency.h"
@ -693,7 +694,7 @@ CreateCast(CreateCastStmt *stmt)
if (procstruct->proisagg)
elog(ERROR, "cast function must not be an aggregate function");
if (procstruct->proretset)
elog(ERROR, "cast function must be not return a set");
elog(ERROR, "cast function must not return a set");
ReleaseSysCache(tuple);
}
@ -727,7 +728,7 @@ CreateCast(CreateCastStmt *stmt)
CatalogCloseIndices(Num_pg_cast_indices, idescs);
}
myself.classId = get_system_catalog_relid(CastRelationName);
myself.classId = RelationGetRelid(relation);
myself.objectId = HeapTupleGetOid(tuple);
myself.objectSubId = 0;
@ -819,21 +820,25 @@ DropCast(DropCastStmt *stmt)
void
DropCastById(Oid castOid)
{
Relation relation;
Relation relation,
index;
ScanKeyData scankey;
HeapScanDesc scan;
IndexScanDesc scan;
HeapTuple tuple;
relation = heap_openr(CastRelationName, RowExclusiveLock);
index = index_openr(CastOidIndex);
ScanKeyEntryInitialize(&scankey, 0x0,
ObjectIdAttributeNumber, F_OIDEQ,
ObjectIdGetDatum(castOid));
scan = heap_beginscan(relation, SnapshotNow, 1, &scankey);
tuple = heap_getnext(scan, ForwardScanDirection);
1, F_OIDEQ, ObjectIdGetDatum(castOid));
scan = index_beginscan(relation, index, SnapshotNow, 1, &scankey);
tuple = index_getnext(scan, ForwardScanDirection);
if (HeapTupleIsValid(tuple))
simple_heap_delete(relation, &tuple->t_self);
else
elog(ERROR, "could not find tuple for cast %u", castOid);
heap_endscan(scan);
index_endscan(scan);
index_close(index);
heap_close(relation, RowExclusiveLock);
}