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/*-------------------------------------------------------------------------
*
* btstrat.c--
* Srategy map entries for the btree indexed access method
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtstrat.c,v 1.6 1997/09/08 02:20:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include <postgres.h>
#include <access/istrat.h>
#include <storage/bufpage.h>
#include <access/nbtree.h>
/*
* Note:
* StrategyNegate, StrategyCommute, and StrategyNegateCommute
* assume <, <=, ==, >=, > ordering.
*/
static StrategyNumber BTNegate[5] = {
BTGreaterEqualStrategyNumber,
BTGreaterStrategyNumber,
InvalidStrategy,
BTLessStrategyNumber,
BTLessEqualStrategyNumber
};
static StrategyNumber BTCommute[5] = {
BTGreaterStrategyNumber,
BTGreaterEqualStrategyNumber,
InvalidStrategy,
BTLessEqualStrategyNumber,
BTLessStrategyNumber
};
static StrategyNumber BTNegateCommute[5] = {
BTLessEqualStrategyNumber,
BTLessStrategyNumber,
InvalidStrategy,
BTGreaterStrategyNumber,
BTGreaterEqualStrategyNumber
};
static uint16 BTLessTermData[] = { /* XXX type clash */
2,
BTLessStrategyNumber,
SK_NEGATE,
BTLessStrategyNumber,
SK_NEGATE | SK_COMMUTE
};
static uint16 BTLessEqualTermData[] = { /* XXX type clash */
2,
BTLessEqualStrategyNumber,
0x0,
BTLessEqualStrategyNumber,
SK_COMMUTE
};
static uint16 BTGreaterEqualTermData[] = { /* XXX type clash */
2,
BTGreaterEqualStrategyNumber,
0x0,
BTGreaterEqualStrategyNumber,
SK_COMMUTE
};
static uint16 BTGreaterTermData[] = { /* XXX type clash */
2,
BTGreaterStrategyNumber,
SK_NEGATE,
BTGreaterStrategyNumber,
SK_NEGATE | SK_COMMUTE
};
static StrategyTerm BTEqualExpressionData[] = {
(StrategyTerm) BTLessTermData, /* XXX */
(StrategyTerm) BTLessEqualTermData, /* XXX */
(StrategyTerm) BTGreaterEqualTermData, /* XXX */
(StrategyTerm) BTGreaterTermData, /* XXX */
NULL
};
static StrategyEvaluationData BTEvaluationData = {
/* XXX static for simplicity */
BTMaxStrategyNumber,
(StrategyTransformMap) BTNegate, /* XXX */
(StrategyTransformMap) BTCommute, /* XXX */
(StrategyTransformMap) BTNegateCommute, /* XXX */
{NULL, NULL, (StrategyExpression) BTEqualExpressionData, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL}
};
/* ----------------------------------------------------------------
* RelationGetBTStrategy
* ----------------------------------------------------------------
*/
StrategyNumber
_bt_getstrat(Relation rel,
AttrNumber attno,
RegProcedure proc)
{
StrategyNumber strat;
strat = RelationGetStrategy(rel, attno, &BTEvaluationData, proc);
Assert(StrategyNumberIsValid(strat));
return (strat);
}
bool
_bt_invokestrat(Relation rel,
AttrNumber attno,
StrategyNumber strat,
Datum left,
Datum right)
{
return (RelationInvokeStrategy(rel, &BTEvaluationData, attno, strat,
left, right));
}
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