greenplumn CXformDifference2LeftAntiSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformDifference2LeftAntiSemiJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformDifference2LeftAntiSemiJoin.h
/
/ @doc:
/ Class to transform logical difference into an aggregate over left anti-semi join
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformDifference2DifferenceAll_H
#define GPOPT_CXformDifference2DifferenceAll_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformDifference2LeftAntiSemiJoin
/
/ @doc:
/ Class to transform logical difference into an aggregate over
/ left anti-semi join
/
/---------------------------------------------------------------------------
class CXformDifference2LeftAntiSemiJoin : public CXformExploration
{
private:
public:
CXformDifference2LeftAntiSemiJoin(
const CXformDifference2LeftAntiSemiJoin &) = delete;
/ ctor
explicit CXformDifference2LeftAntiSemiJoin(CMemoryPool *mp);
/ dtor
~CXformDifference2LeftAntiSemiJoin() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfDifference2LeftAntiSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformDifference2LeftAntiSemiJoin";
}
/ compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & / exprhdl
) const override
{
return CXform::ExfpHigh;
}
/ actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; / class CXformDifference2LeftAntiSemiJoin
} / namespace gpopt
#endif / !GPOPT_CXformDifference2DifferenceAll_H
/ EOF
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