greenplumn CExpressionUtils 源码
greenplumn CExpressionUtils 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CExpressionUtils.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CExpressionUtils.h
//
// @doc:
// Utility routines for transforming expressions
//
// @owner:
// ,
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_CExpressionUtils_H
#define GPOPT_CExpressionUtils_H
#include "gpos/base.h"
#include "gpopt/operators/CExpression.h"
namespace gpopt
{
using namespace gpos;
// fwd declarations
class CExpression;
//---------------------------------------------------------------------------
// @class:
// CExpressionUtils
//
// @doc:
// Utility routines for transforming expressions
//
//---------------------------------------------------------------------------
class CExpressionUtils
{
private:
// unnest a given expression's child and append unnested nodes to given array
static void UnnestChild(CMemoryPool *mp, CExpression *pexpr,
ULONG UlChildIndex, BOOL fAnd, BOOL fOr,
BOOL fNotChildren, CExpressionArray *pdrgpexpr);
// append the unnested children of given expression to given array
static void AppendChildren(CMemoryPool *mp, CExpression *pexpr,
CExpressionArray *pdrgpexpr);
// return an array of expression children after being unnested
static CExpressionArray *PdrgpexprUnnestChildren(CMemoryPool *mp,
CExpression *pexpr);
// push not expression one level down the given expression
static CExpression *PexprPushNotOneLevel(CMemoryPool *mp,
CExpression *pexpr);
public:
// remove duplicate AND/OR children
static CExpression *PexprDedupChildren(CMemoryPool *mp, CExpression *pexpr);
// unnest AND/OR/NOT predicates
static CExpression *PexprUnnest(CMemoryPool *mp, CExpression *pexpr);
};
} // namespace gpopt
#endif // !GPOPT_CExpressionUtils_H
// EOF
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