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/*-------------------------------------------------------------------------
*
* strat.h--
* index strategy type definitions
* (separated out from original istrat.h to avoid circular refs)
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: strat.h,v 1.4 1996/11/04 07:45:27 scrappy 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 h/skey.h */
} StrategyOperatorData;
typedef StrategyOperatorData *StrategyOperator;
typedef struct StrategyTermData { /* conjunctive term */
uint16 degree;
StrategyOperatorData operatorData[1]; /* VARIABLE LENGTH */
} 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;
StrategyTransformMap negateTransform;
StrategyTransformMap commuteTransform;
StrategyTransformMap negateCommuteTransform;
StrategyExpression expression[12]; /* XXX VARIABLE LENGTH */
} StrategyEvaluationData; /* VARIABLE LENGTH STRUCTURE */
typedef StrategyEvaluationData *StrategyEvaluation;
/*
* StrategyTransformMapIsValid --
* Returns true iff strategy transformation map is valid.
*/
#define StrategyTransformMapIsValid(transform) PointerIsValid(transform)
#ifndef CorrectStrategies /* XXX this should be removable */
#define AMStrategies(foo) 12
#else /* !defined(CorrectStrategies) */
#define AMStrategies(foo) (foo)
#endif /* !defined(CorrectStrategies) */
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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