greenplumn CXformDifference2LeftAntiSemiJoin 源码
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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