greenplumn CXformPushDownLeftOuterJoin 源码

  • 2022-08-18
  • 浏览 (354)

greenplumn CXformPushDownLeftOuterJoin 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2013 EMC Corp.
//
//	@filename:
//		CXformPushDownLeftOuterJoin.h
//
//	@doc:
//		Push LOJ below NAry join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformPushDownLeftOuterJoin_H
#define GPOPT_CXformPushDownLeftOuterJoin_H

#include "gpos/base.h"

#include "gpopt/xforms/CXformExploration.h"

namespace gpopt
{
using namespace gpos;

//---------------------------------------------------------------------------
//	@class:
//		CXformPushDownLeftOuterJoin
//
//	@doc:
//		Transform LOJ whose outer child is an NAry-join to be a child
//		of NAry-join
//
//---------------------------------------------------------------------------
class CXformPushDownLeftOuterJoin : public CXformExploration
{
private:
public:
	CXformPushDownLeftOuterJoin(const CXformPushDownLeftOuterJoin &) = delete;

	// ctor
	explicit CXformPushDownLeftOuterJoin(CMemoryPool *mp);

	// dtor
	~CXformPushDownLeftOuterJoin() override = default;

	// xform promise
	CXform::EXformPromise Exfp(CExpressionHandle &exprhdl) const override;

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

	// return a string for xform name
	const CHAR *
	SzId() const override
	{
		return "CXformPushDownLeftOuterJoin";
	}

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

};	// class CXformPushDownLeftOuterJoin

}  // namespace gpopt

#endif	// !GPOPT_CXformPushDownLeftOuterJoin_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