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37168b8da4
right thing with variable-free clauses that contain noncachable functions, such as 'WHERE random() < 0.5' --- these are evaluated once per potential output tuple. Expressions that contain only Params are now candidates to be indexscan quals --- for example, 'var = ($1 + 1)' can now be indexed. Cope with RelabelType nodes atop potential indexscan variables --- this oversight prevents 7.0.* from recognizing some potentially indexscanable situations.
44 lines
1.6 KiB
C
44 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 1.25 2000/08/13 02:50:31 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_attdisbursion(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 HeapTuple get_operator_tuple(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 Datum get_typdefault(Oid typid);
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#endif /* LSYSCACHE_H */
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