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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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19
src/include/utils/typcache.h
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@ -9,13 +9,14 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/typcache.h,v 1.2 2003/11/29 22:41:16 pgsql Exp $
* $PostgreSQL: pgsql/src/include/utils/typcache.h,v 1.3 2004/04/01 21:28:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TYPCACHE_H
#define TYPCACHE_H
#include "access/tupdesc.h"
#include "fmgr.h"
@ -28,6 +29,8 @@ typedef struct TypeCacheEntry
int16 typlen;
bool typbyval;
char typalign;
char typtype;
Oid typrelid;
/*
* Information obtained from opclass entries
@ -51,6 +54,13 @@ typedef struct TypeCacheEntry
*/
FmgrInfo eq_opr_finfo;
FmgrInfo cmp_proc_finfo;
/*
* Tuple descriptor if it's a composite type (row type). NULL if not
* composite or information hasn't yet been requested. (NOTE: this
* is actually just a link to information maintained by relcache.c.)
*/
TupleDesc tupDesc;
} TypeCacheEntry;
/* Bit flags to indicate which fields a given caller needs to have set */
@ -60,7 +70,14 @@ typedef struct TypeCacheEntry
#define TYPECACHE_CMP_PROC 0x0008
#define TYPECACHE_EQ_OPR_FINFO 0x0010
#define TYPECACHE_CMP_PROC_FINFO 0x0020
#define TYPECACHE_TUPDESC 0x0040
extern TypeCacheEntry *lookup_type_cache(Oid type_id, int flags);
extern TupleDesc lookup_rowtype_tupdesc(Oid type_id, int32 typmod);
extern void assign_record_type_typmod(TupleDesc tupDesc);
extern void flush_rowtype_cache(Oid type_id);
#endif /* TYPCACHE_H */