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Replace TupleTableSlot convention for whole-row variables and function

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results with tuples as ordinary varlena Datums.  This commit does not
in itself do much for us, except eliminate the horrid memory leak
associated with evaluation of whole-row variables.  However, it lays the
groundwork for allowing composite types as table columns, and perhaps
some other useful features as well.  Per my proposal of a few days ago.
This commit is contained in:
Tom Lane
2004-04-01 21:28:47 +00:00
parent 8590a62b75
commit 375369acd1
60 changed files with 1779 additions and 1733 deletions
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30
src/backend/utils/cache/relcache.c vendored
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.200 2004/03/16 05:05:58 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.201 2004/04/01 21:28:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,6 +63,7 @@
#include "utils/lsyscache.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
/*
@ -432,7 +433,10 @@ RelationBuildTupleDesc(RelationBuildDescInfo buildinfo,
AttrDefault *attrdef = NULL;
int ndef = 0;
relation->rd_att->tdhasoid = RelationGetForm(relation)->relhasoids;
/* copy some fields from pg_class row to rd_att */
relation->rd_att->tdtypeid = relation->rd_rel->reltype;
relation->rd_att->tdtypmod = -1; /* unnecessary, but... */
relation->rd_att->tdhasoid = relation->rd_rel->relhasoids;
constr = (TupleConstr *) MemoryContextAlloc(CacheMemoryContext,
sizeof(TupleConstr));
@ -1312,9 +1316,12 @@ formrdesc(const char *relationName,
* Unlike the case with the relation tuple, this data had better be right
* because it will never be replaced. The input values must be
* correctly defined by macros in src/include/catalog/ headers.
*
* Note however that rd_att's tdtypeid, tdtypmod, tdhasoid fields are
* not right at this point. They will be fixed later when the real
* pg_class row is loaded.
*/
relation->rd_att = CreateTemplateTupleDesc(natts,
relation->rd_rel->relhasoids);
relation->rd_att = CreateTemplateTupleDesc(natts, false);
/*
* initialize tuple desc info
@ -1595,6 +1602,7 @@ RelationReloadClassinfo(Relation relation)
static void
RelationClearRelation(Relation relation, bool rebuild)
{
Oid old_reltype = relation->rd_rel->reltype;
MemoryContext oldcxt;
/*
@ -1679,6 +1687,7 @@ RelationClearRelation(Relation relation, bool rebuild)
if (!rebuild)
{
/* ok to zap remaining substructure */
flush_rowtype_cache(old_reltype);
FreeTupleDesc(relation->rd_att);
if (relation->rd_rulescxt)
MemoryContextDelete(relation->rd_rulescxt);
@ -1704,6 +1713,7 @@ RelationClearRelation(Relation relation, bool rebuild)
if (RelationBuildDesc(buildinfo, relation) != relation)
{
/* Should only get here if relation was deleted */
flush_rowtype_cache(old_reltype);
FreeTupleDesc(old_att);
if (old_rulescxt)
MemoryContextDelete(old_rulescxt);
@ -1715,11 +1725,15 @@ RelationClearRelation(Relation relation, bool rebuild)
relation->rd_isnew = old_isnew;
if (equalTupleDescs(old_att, relation->rd_att))
{
/* needn't flush typcache here */
FreeTupleDesc(relation->rd_att);
relation->rd_att = old_att;
}
else
{
flush_rowtype_cache(old_reltype);
FreeTupleDesc(old_att);
}
if (equalRuleLocks(old_rules, relation->rd_rules))
{
if (relation->rd_rulescxt)
@ -2329,6 +2343,12 @@ RelationCacheInitializePhase2(void)
*/
Assert(relation->rd_rel != NULL);
memcpy((char *) relation->rd_rel, (char *) relp, CLASS_TUPLE_SIZE);
/*
* Also update the derived fields in rd_att.
*/
relation->rd_att->tdtypeid = relp->reltype;
relation->rd_att->tdtypmod = -1; /* unnecessary, but... */
relation->rd_att->tdhasoid = relp->relhasoids;
ReleaseSysCache(htup);
@ -2918,6 +2938,8 @@ load_relcache_init_file(void)
/* initialize attribute tuple forms */
rel->rd_att = CreateTemplateTupleDesc(relform->relnatts,
relform->relhasoids);
rel->rd_att->tdtypeid = relform->reltype;
rel->rd_att->tdtypmod = -1; /* unnecessary, but... */
/* next read all the attribute tuple form data entries */
has_not_null = false;