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a933ee38bb
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.
45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* lsyscache.h
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* Convenience routines for common queries in the system catalog cache.
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: lsyscache.h,v 1.27 2000/11/16 22:30:49 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LSYSCACHE_H
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#define LSYSCACHE_H
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#include "access/htup.h"
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extern bool op_class(Oid opno, Oid opclass, Oid amopid);
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extern char *get_attname(Oid relid, AttrNumber attnum);
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extern AttrNumber get_attnum(Oid relid, char *attname);
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extern Oid get_atttype(Oid relid, AttrNumber attnum);
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extern bool get_attisset(Oid relid, char *attname);
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extern int32 get_atttypmod(Oid relid, AttrNumber attnum);
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extern double get_attdispersion(Oid relid, AttrNumber attnum,
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double min_estimate);
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extern RegProcedure get_opcode(Oid opno);
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extern char *get_opname(Oid opno);
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extern bool op_mergejoinable(Oid opno, Oid ltype, Oid rtype,
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Oid *leftOp, Oid *rightOp);
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extern Oid op_hashjoinable(Oid opno, Oid ltype, Oid rtype);
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extern bool op_iscachable(Oid opno);
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extern Oid get_commutator(Oid opno);
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extern Oid get_negator(Oid opno);
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extern RegProcedure get_oprrest(Oid opno);
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extern RegProcedure get_oprjoin(Oid opno);
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extern Oid get_func_rettype(Oid funcid);
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extern bool func_iscachable(Oid funcid);
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extern char *get_rel_name(Oid relid);
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extern int16 get_typlen(Oid typid);
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extern bool get_typbyval(Oid typid);
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extern void get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval);
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extern Datum get_typdefault(Oid typid);
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#endif /* LSYSCACHE_H */
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