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100 lines
1.7 KiB
C
100 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* btstrat.c--
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* Srategy map entries for the btree indexed access method
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/hash/Attic/hashstrat.c,v 1.7 1996/11/05 09:40:24 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <postgres.h>
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#include <access/hash.h>
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#include <access/istrat.h>
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/*
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* only one valid strategy for hash tables: equality.
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*/
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static StrategyNumber HTNegate[1] = {
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InvalidStrategy
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};
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static StrategyNumber HTCommute[1] = {
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HTEqualStrategyNumber
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};
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static StrategyNumber HTNegateCommute[1] = {
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InvalidStrategy
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};
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static StrategyEvaluationData HTEvaluationData = {
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/* XXX static for simplicity */
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HTMaxStrategyNumber,
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(StrategyTransformMap)HTNegate,
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(StrategyTransformMap)HTCommute,
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(StrategyTransformMap)HTNegateCommute,
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{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL}
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};
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/* ----------------------------------------------------------------
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* RelationGetHashStrategy
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* ----------------------------------------------------------------
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*/
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StrategyNumber
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_hash_getstrat(Relation rel,
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AttrNumber attno,
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RegProcedure proc)
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{
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StrategyNumber strat;
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strat = RelationGetStrategy(rel, attno, &HTEvaluationData, proc);
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Assert(StrategyNumberIsValid(strat));
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return (strat);
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}
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bool
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_hash_invokestrat(Relation rel,
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AttrNumber attno,
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StrategyNumber strat,
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Datum left,
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Datum right)
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{
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return (RelationInvokeStrategy(rel, &HTEvaluationData, attno, strat,
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left, right));
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}
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