greenplumn predtest_valueset 源码
greenplumn predtest_valueset 代码
文件路径：/src/include/optimizer/predtest_valueset.h
/*-------------------------------------------------------------------------
*
* predtest_valueset.h
* functions for "value set" tests.
*
*
* Portions Copyright (c) 2005-2009, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/optimizer/predtest_valueset.h
*
*-------------------------------------------------------------------------
*/
#ifndef PREDTEST_VALUESET_H
#define PREDTEST_VALUESET_H
#include "nodes/primnodes.h"
#include "utils/hsearch.h"
#include "utils/memutils.h"
/***************************************************************************************
* BEGIN functions and structures for determining a set of possible values from a clause
*/
typedef struct
{
/**
* the set of possible values, if this can be determined from the clause.
*/
HTAB *set;
/**
* The memory context that contains the hashtable and its set of possible values
*/
MemoryContext memoryContext;
/**
* if true then set should be ignored and instead we know that we don't know anything about the set of values
*/
bool isAnyValuePossible;
} PossibleValueSet;
extern PossibleValueSet DeterminePossibleValueSet(Node *clause, Node *variable);
/* returns a newly allocated list */
extern Node **GetPossibleValuesAsArray(PossibleValueSet *pvs, int *numValuesOut);
extern void DeletePossibleValueSetData(PossibleValueSet *pvs);
extern void InitPossibleValueSetData(PossibleValueSet *pvs);
extern void AddUnmatchingValues(PossibleValueSet *pvs, PossibleValueSet *toCheck);
extern void RemoveUnmatchingValues(PossibleValueSet *pvs, PossibleValueSet *toCheck);
extern bool TryProcessExprForPossibleValues(Node *expr, Node *variable, PossibleValueSet *resultOut);
#endif /* PREDTEST_VALUESET_H */
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