greenplumn CXformLeftOuterApply2LeftOuterJoin 源码

  • 2022-08-18
  • 浏览 (321)

greenplumn CXformLeftOuterApply2LeftOuterJoin 代码

文件路径:/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftOuterApply2LeftOuterJoin.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CXformLeftOuterApply2LeftOuterJoin.h
//
//	@doc:
//		Turn left outer apply into left outer join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftOuterApply2LeftOuterJoin_H
#define GPOPT_CXformLeftOuterApply2LeftOuterJoin_H

#include "gpos/base.h"

#include "gpopt/operators/CLogicalLeftOuterApply.h"
#include "gpopt/operators/CLogicalLeftOuterJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"

namespace gpopt
{
using namespace gpos;

//---------------------------------------------------------------------------
//	@class:
//		CXformLeftOuterApply2LeftOuterJoin
//
//	@doc:
//		Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftOuterApply2LeftOuterJoin
	: public CXformApply2Join<CLogicalLeftOuterApply, CLogicalLeftOuterJoin>
{
private:
public:
	CXformLeftOuterApply2LeftOuterJoin(
		const CXformLeftOuterApply2LeftOuterJoin &) = delete;

	// ctor
	explicit CXformLeftOuterApply2LeftOuterJoin(CMemoryPool *mp)
		: CXformApply2Join<CLogicalLeftOuterApply, CLogicalLeftOuterJoin>(
			  mp, true /*fDeepTree*/)
	{
	}

	// dtor
	~CXformLeftOuterApply2LeftOuterJoin() override = default;

	// ident accessors
	EXformId
	Exfid() const override
	{
		return ExfLeftOuterApply2LeftOuterJoin;
	}

	const CHAR *
	SzId() const override
	{
		return "CXformLeftOuterApply2LeftOuterJoin";
	}

	// compute xform promise for a given expression handle
	EXformPromise Exfp(CExpressionHandle &exprhdl) const override;

	// actual transform
	void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
				   CExpression *pexpr) const override;


};	// class CXformLeftOuterApply2LeftOuterJoin

}  // namespace gpopt

#endif	// !GPOPT_CXformLeftOuterApply2LeftOuterJoin_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CDecorrelator 源码

greenplumn CJoinOrder 源码

greenplumn CJoinOrderDP 源码

greenplumn CJoinOrderDPv2 源码

greenplumn CJoinOrderGreedy 源码

greenplumn CJoinOrderMinCard 源码

greenplumn CSubqueryHandler 源码

greenplumn CXform 源码

greenplumn CXformAntiSemiJoinAntiSemiJoinNotInSwap 源码

greenplumn CXformAntiSemiJoinAntiSemiJoinSwap 源码

0  赞