greenplumn CXformDifferenceAll2LeftAntiSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformDifferenceAll2LeftAntiSemiJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CXformDifferenceAll2LeftAntiSemiJoin.h
/
/ @doc:
/ Class to transform logical difference all into a LASJ
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformDifferenceAll2LeftAntiSemiJoin_H
#define GPOPT_CXformDifferenceAll2LeftAntiSemiJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformDifferenceAll2LeftAntiSemiJoin
/
/ @doc:
/ Class to transform logical difference all into a LASJ
/
/---------------------------------------------------------------------------
class CXformDifferenceAll2LeftAntiSemiJoin : public CXformExploration
{
private:
public:
CXformDifferenceAll2LeftAntiSemiJoin(
const CXformDifferenceAll2LeftAntiSemiJoin &) = delete;
/ ctor
explicit CXformDifferenceAll2LeftAntiSemiJoin(CMemoryPool *mp);
/ dtor
~CXformDifferenceAll2LeftAntiSemiJoin() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfDifferenceAll2LeftAntiSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformDifferenceAll2LeftAntiSemiJoin";
}
/ 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 CXformDifferenceAll2LeftAntiSemiJoin
} / namespace gpopt
#endif / !GPOPT_CXformDifferenceAll2LeftAntiSemiJoin_H
/ EOF
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