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/*-------------------------------------------------------------------------
*
* strat.h
* index strategy type definitions
* (separated out from original istrat.h to avoid circular refs)
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: strat.h,v 1.22 2001/05/30 19:53:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef STRAT_H
#define STRAT_H
#include "access/skey.h"
typedef uint16 StrategyNumber;
#define InvalidStrategy 0
typedef struct StrategyTransformMapData
{
StrategyNumber strategy[1]; /* VARIABLE LENGTH ARRAY */
} StrategyTransformMapData; /* VARIABLE LENGTH STRUCTURE */
typedef StrategyTransformMapData *StrategyTransformMap;
typedef struct StrategyOperatorData
{
StrategyNumber strategy;
bits16 flags; /* scan qualification flags, see skey.h */
} StrategyOperatorData;
typedef StrategyOperatorData *StrategyOperator;
typedef struct StrategyTermData
{ /* conjunctive term */
uint16 degree;
StrategyOperatorData operatorData[1]; /* VARIABLE LENGTH ARRAY */
} StrategyTermData; /* VARIABLE LENGTH STRUCTURE */
typedef StrategyTermData *StrategyTerm;
typedef struct StrategyExpressionData
{ /* disjunctive normal form */
StrategyTerm term[1]; /* VARIABLE LENGTH ARRAY */
} StrategyExpressionData; /* VARIABLE LENGTH STRUCTURE */
typedef StrategyExpressionData *StrategyExpression;
typedef struct StrategyEvaluationData
{
StrategyNumber maxStrategy;
/* each of these must point to an array of maxStrategy elements: */
StrategyTransformMap negateTransform;
StrategyTransformMap commuteTransform;
StrategyTransformMap negateCommuteTransform;
StrategyExpression *expression;
} StrategyEvaluationData;
typedef StrategyEvaluationData *StrategyEvaluation;
/*
* StrategyTransformMapIsValid
* Returns true iff strategy transformation map is valid.
*/
#define StrategyTransformMapIsValid(transform) PointerIsValid(transform)
#define AMStrategies(foo) (foo)
typedef struct StrategyMapData
{
ScanKeyData entry[1]; /* VARIABLE LENGTH ARRAY */
} StrategyMapData; /* VARIABLE LENGTH STRUCTURE */
typedef StrategyMapData *StrategyMap;
typedef struct IndexStrategyData
{
StrategyMapData strategyMapData[1]; /* VARIABLE LENGTH ARRAY */
} IndexStrategyData; /* VARIABLE LENGTH STRUCTURE */
typedef IndexStrategyData *IndexStrategy;
#endif /* STRAT_H */
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