数据库系统

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strat.h：源码内容

							/*-------------------------------------------------------------------------
 *
 * 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 1.15.2.1 1999/07/30 18:26:59 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)
#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 */

						