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qual_extract.h
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qual_extract.h
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/*-------------------------------------------------------------------------
*
* qual_extract.h
* Quals extraction utility
*
* Copyright (c) 2012, PostgreSQL Global Development Group
*
* This software is released under the PostgreSQL Licence.
*
* Author: Zheng Yang <zhengyang4k@gmail.com>
*
* IDENTIFICATION
* contrib/dc_fdw/qual_extract.h
*
*-------------------------------------------------------------------------
*/
#ifndef QUAL_EXTRACT_H
#define QUAL_EXTRACT_H
/*#define DEBUG*/
#include "postgres.h"
#include "foreign/foreign.h"
#include "nodes/relation.h"
#include "utils/relcache.h"
/*
* Tree Nodes for qual pushdown evaluation
*/
typedef struct PushableQualNode
{
StringInfoData opname; /* bool_node: [AND, OR, NOT] op_node: [@@, =] */
StringInfoData optype; /* [bool_node, op_node] */
StringInfoData leftOperand; /* for op_node only */
StringInfoData rightOperand; /* for op_node only */
List *childNodes; /* for bool_node only */
List *plist; /* postings list assoc with this qual */
} PushableQualNode;
/*
* Extraction function
*/
int extractQuals(PushableQualNode **qualRoot, PlannerInfo *root, RelOptInfo *baserel, List *mapping);
void freeQualTree(PushableQualNode *qualRoot);
void printQualTree(PushableQualNode *qualRoot, int indentLevel);
#endif /* QUAL_EXTRACT_H */