mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-15 16:00:35 +02:00
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* 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 */
|