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Change SearchSysCache coding conventions so that a reference count is

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maintained for each cache entry.  A cache entry will not be freed until
the matching ReleaseSysCache call has been executed.  This eliminates
worries about cache entries getting dropped while still in use.  See
my posting to pg-hackers of even date for more info.
This commit is contained in:
Tom Lane
2000-11-16 22:30:52 +00:00
parent cff23842a4
commit a933ee38bb
95 changed files with 2672 additions and 2314 deletions
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23
src/backend/rewrite/rewriteManip.c
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@ -7,12 +7,13 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.50 2000/10/05 19:11:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteManip.c,v 1.51 2000/11/16 22:30:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "nodes/makefuncs.h"
#include "optimizer/clauses.h"
#include "optimizer/tlist.h"
#include "parser/parsetree.h"
@ -555,20 +556,6 @@ AddNotQual(Query *parsetree, Node *qual)
}
/* Build a NULL constant expression of the given type */
static Node *
make_null(Oid type)
{
Const *c = makeNode(Const);
c->consttype = type;
c->constlen = get_typlen(type);
c->constvalue = PointerGetDatum(NULL);
c->constisnull = true;
c->constbyval = get_typbyval(type);
return (Node *) c;
}
/* Find a targetlist entry by resno */
static Node *
FindMatchingNew(List *tlist, int attno)
@ -656,7 +643,7 @@ ResolveNew_mutator(Node *node, ResolveNew_context *context)
else
{
/* Otherwise replace unmatched var with a null */
return make_null(var->vartype);
return (Node *) makeNullConst(var->vartype);
}
}
else
@ -796,7 +783,7 @@ HandleRIRAttributeRule_mutator(Node *node,
{ /* HACK: disallow SET variables */
*context->modified = TRUE;
*context->badsql = TRUE;
return make_null(var->vartype);
return (Node *) makeNullConst(var->vartype);
}
else
{
@ -813,7 +800,7 @@ HandleRIRAttributeRule_mutator(Node *node,
n = FindMatchingTLEntry(context->targetlist,
name_to_look_for);
if (n == NULL)
return make_null(var->vartype);
return (Node *) makeNullConst(var->vartype);
/* Make a copy of the tlist item to return */
n = copyObject(n);