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375369acd1
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.
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* typcache.h
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* Type cache definitions.
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*
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* The type cache exists to speed lookup of certain information about data
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* types that is not directly available from a type's pg_type row.
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/typcache.h,v 1.3 2004/04/01 21:28:46 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TYPCACHE_H
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#define TYPCACHE_H
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#include "access/tupdesc.h"
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#include "fmgr.h"
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typedef struct TypeCacheEntry
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{
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/* typeId is the hash lookup key and MUST BE FIRST */
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Oid type_id; /* OID of the data type */
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/* some subsidiary information copied from the pg_type row */
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int16 typlen;
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bool typbyval;
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char typalign;
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char typtype;
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Oid typrelid;
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/*
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* Information obtained from opclass entries
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*
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* These will be InvalidOid if no match could be found, or if the
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* information hasn't yet been requested.
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*/
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Oid btree_opc; /* OID of the default btree opclass */
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Oid hash_opc; /* OID of the default hash opclass */
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Oid eq_opr; /* OID of the equality operator */
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Oid lt_opr; /* OID of the less-than operator */
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Oid gt_opr; /* OID of the greater-than operator */
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Oid cmp_proc; /* OID of the btree comparison function */
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/*
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* Pre-set-up fmgr call info for the equality operator and the btree
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* comparison function. These are kept in the type cache to avoid
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* problems with memory leaks in repeated calls to array_eq and array_cmp.
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* There is not currently a need to maintain call info for the lt_opr
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* or gt_opr.
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*/
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FmgrInfo eq_opr_finfo;
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FmgrInfo cmp_proc_finfo;
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/*
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* Tuple descriptor if it's a composite type (row type). NULL if not
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* composite or information hasn't yet been requested. (NOTE: this
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* is actually just a link to information maintained by relcache.c.)
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*/
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TupleDesc tupDesc;
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} TypeCacheEntry;
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/* Bit flags to indicate which fields a given caller needs to have set */
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#define TYPECACHE_EQ_OPR 0x0001
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#define TYPECACHE_LT_OPR 0x0002
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#define TYPECACHE_GT_OPR 0x0004
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#define TYPECACHE_CMP_PROC 0x0008
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#define TYPECACHE_EQ_OPR_FINFO 0x0010
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#define TYPECACHE_CMP_PROC_FINFO 0x0020
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#define TYPECACHE_TUPDESC 0x0040
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extern TypeCacheEntry *lookup_type_cache(Oid type_id, int flags);
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extern TupleDesc lookup_rowtype_tupdesc(Oid type_id, int32 typmod);
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extern void assign_record_type_typmod(TupleDesc tupDesc);
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extern void flush_rowtype_cache(Oid type_id);
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#endif /* TYPCACHE_H */
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