greenplumn CXformAntiSemiJoinNotInAntiSemiJoinSwap 源码

  • 2022-08-18
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greenplumn CXformAntiSemiJoinNotInAntiSemiJoinSwap 代码

文件路径:/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformAntiSemiJoinNotInAntiSemiJoinSwap.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2013 EMC Corp.
//
//	@filename:
//		CXformAntiSemiJoinNotInAntiSemiJoinSwap.h
//
//	@doc:
//		Swap cascaded anti semi-join (NotIn) and anti semi-join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformAntiSemiJoinNotInAntiSemiJoinSwap_H
#define GPOPT_CXformAntiSemiJoinNotInAntiSemiJoinSwap_H

#include "gpos/base.h"

#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoinNotIn.h"
#include "gpopt/xforms/CXformJoinSwap.h"

namespace gpopt
{
using namespace gpos;

//---------------------------------------------------------------------------
//	@class:
//		CXformAntiSemiJoinNotInAntiSemiJoinSwap
//
//	@doc:
//		Swap cascaded anti semi-join (NotIn) and anti semi-join
//
//---------------------------------------------------------------------------
class CXformAntiSemiJoinNotInAntiSemiJoinSwap
	: public CXformJoinSwap<CLogicalLeftAntiSemiJoinNotIn,
							CLogicalLeftAntiSemiJoin>
{
private:
public:
	CXformAntiSemiJoinNotInAntiSemiJoinSwap(
		const CXformAntiSemiJoinNotInAntiSemiJoinSwap &) = delete;

	// ctor
	explicit CXformAntiSemiJoinNotInAntiSemiJoinSwap(CMemoryPool *mp)
		: CXformJoinSwap<CLogicalLeftAntiSemiJoinNotIn,
						 CLogicalLeftAntiSemiJoin>(mp)
	{
	}

	// dtor
	~CXformAntiSemiJoinNotInAntiSemiJoinSwap() override = default;

	// Compatibility function
	BOOL
	FCompatible(CXform::EXformId exfid) override
	{
		return ExfAntiSemiJoinAntiSemiJoinNotInSwap != exfid;
	}

	// ident accessors
	EXformId
	Exfid() const override
	{
		return ExfAntiSemiJoinNotInAntiSemiJoinSwap;
	}

	const CHAR *
	SzId() const override
	{
		return "CXformAntiSemiJoinNotInAntiSemiJoinSwap";
	}

};	// class CXformAntiSemiJoinNotInAntiSemiJoinSwap

}  // namespace gpopt

#endif	// !GPOPT_CXformAntiSemiJoinNotInAntiSemiJoinSwap_H

// EOF

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