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Make planner safe for recursive calls --- needed for cases where

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eval_const_expressions tries to simplify an SQL function.
This commit is contained in:
Tom Lane
2000-07-27 23:16:04 +00:00
parent faa4171728
commit ff7da2f498
3 changed files with 32 additions and 54 deletions
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58
src/backend/optimizer/util/plancat.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/plancat.c,v 1.59 2000/07/05 23:11:26 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/plancat.c,v 1.60 2000/07/27 23:16:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -272,15 +272,12 @@ join_selectivity(Oid functionObjectId,
List *
find_inheritance_children(Oid inhparent)
{
static ScanKeyData key[1] = {
{0, Anum_pg_inherits_inhparent, F_OIDEQ}
};
List *list = NIL;
Relation relation;
HeapScanDesc scan;
HeapTuple inheritsTuple;
Oid inhrelid;
ScanKeyData key[1];
/*
* Can skip the scan if pg_class shows the relation has never had
@@ -289,10 +286,11 @@ find_inheritance_children(Oid inhparent)
if (! has_subclass(inhparent))
return NIL;
fmgr_info(F_OIDEQ, &key[0].sk_func);
key[0].sk_nargs = key[0].sk_func.fn_nargs;
key[0].sk_argument = ObjectIdGetDatum(inhparent);
ScanKeyEntryInitialize(&key[0],
(bits16) 0x0,
(AttrNumber) Anum_pg_inherits_inhparent,
(RegProcedure) F_OIDEQ,
ObjectIdGetDatum(inhparent));
relation = heap_openr(InheritsRelationName, AccessShareLock);
scan = heap_beginscan(relation, 0, SnapshotNow, 1, key);
while (HeapTupleIsValid(inheritsTuple = heap_getnext(scan, 0)))
@@ -330,45 +328,3 @@ has_subclass(Oid relationId)
relationId);
return ((Form_pg_class) GETSTRUCT(tuple))->relhassubclass;
}
#ifdef NOT_USED
/*
* VersionGetParents
*
* Returns a LISP list containing the OIDs of all relations which are
* base relations of the relation with OID 'verrelid'.
*/
List *
VersionGetParents(Oid verrelid)
{
static ScanKeyData key[1] = {
{0, Anum_pg_version_verrelid, F_OIDEQ}
};
HeapTuple versionTuple;
Relation relation;
HeapScanDesc scan;
Oid verbaseid;
List *list = NIL;
fmgr_info(F_OIDEQ, &key[0].sk_func);
key[0].sk_nargs = key[0].sk_func.fn_nargs;
key[0].sk_argument = ObjectIdGetDatum(verrelid);
relation = heap_openr(VersionRelationName, AccessShareLock);
scan = heap_beginscan(relation, 0, SnapshotNow, 1, key);
while (HeapTupleIsValid(versionTuple = heap_getnext(scan, 0)))
{
verbaseid = ((Form_pg_version)
GETSTRUCT(versionTuple))->verbaseid;
list = lconsi(verbaseid, list);
key[0].sk_argument = ObjectIdGetDatum(verbaseid);
heap_rescan(scan, 0, key);
}
heap_endscan(scan);
heap_close(relation, AccessShareLock);
return list;
}
#endif