greenplumn CLogicalLeftSemiApply 源码

greenplumn CLogicalLeftSemiApply 代码

文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftSemiApply.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright 2011 EMC Corp.
//
//	@filename:
//		CLogicalLeftSemiApply.h
//
//	@doc:
//		Logical Left Semi Apply operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftSemiApply_H
#define GPOPT_CLogicalLeftSemiApply_H

#include "gpos/base.h"

#include "gpopt/operators/CLogicalApply.h"

namespace gpopt
{
//---------------------------------------------------------------------------
//	@class:
//		CLogicalLeftSemiApply
//
//	@doc:
//		Logical Apply operator used in EXISTS subquery transformations
//
//---------------------------------------------------------------------------
class CLogicalLeftSemiApply : public CLogicalApply
{
private:
public:
	CLogicalLeftSemiApply(const CLogicalLeftSemiApply &) = delete;

	// ctor
	explicit CLogicalLeftSemiApply(CMemoryPool *mp) : CLogicalApply(mp)
	{
		m_pdrgpcrInner = GPOS_NEW(mp) CColRefArray(mp);
	}

	// ctor
	CLogicalLeftSemiApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
						  EOperatorId eopidOriginSubq)
		: CLogicalApply(mp, pdrgpcrInner, eopidOriginSubq)
	{
	}

	// dtor
	~CLogicalLeftSemiApply() override = default;

	// ident accessors
	EOperatorId
	Eopid() const override
	{
		return EopLogicalLeftSemiApply;
	}

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

	// return true if we can pull projections up past this operator from its given child
	BOOL
	FCanPullProjectionsUp(ULONG child_index) const override
	{
		return (0 == child_index);
	}

	//-------------------------------------------------------------------------------------
	// Derived Relational Properties
	//-------------------------------------------------------------------------------------

	// derive output columns
	CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
									CExpressionHandle &exprhdl) override;

	// derive not nullable output columns
	CColRefSet *
	DeriveNotNullColumns(CMemoryPool *,	 // mp
						 CExpressionHandle &exprhdl) const override
	{
		return PcrsDeriveNotNullPassThruOuter(exprhdl);
	}

	// derive keys
	CKeyCollection *
	DeriveKeyCollection(CMemoryPool *,	// mp
						CExpressionHandle &exprhdl) const override
	{
		return PkcDeriveKeysPassThru(exprhdl, 0 /*child_index*/);
	}

	// derive max card
	CMaxCard DeriveMaxCard(CMemoryPool *mp,
						   CExpressionHandle &exprhdl) const override;

	// derive constraint property
	CPropConstraint *
	DerivePropertyConstraint(CMemoryPool *,	 //mp,
							 CExpressionHandle &exprhdl) const override
	{
		return PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
	}

	//-------------------------------------------------------------------------------------
	// Transformations
	//-------------------------------------------------------------------------------------

	// candidate set of xforms
	CXformSet *PxfsCandidates(CMemoryPool *mp) const override;

	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------

	// return a copy of the operator with remapped columns
	COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
										  UlongToColRefMap *colref_mapping,
										  BOOL must_exist) override;

	// return true if operator is a left semi apply
	BOOL
	FLeftSemiApply() const override
	{
		return true;
	}

	// conversion function
	static CLogicalLeftSemiApply *
	PopConvert(COperator *pop)
	{
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(CUtils::FLeftSemiApply(pop));

		return dynamic_cast<CLogicalLeftSemiApply *>(pop);
	}

};	// class CLogicalLeftSemiApply

}  // namespace gpopt


#endif	// !GPOPT_CLogicalLeftSemiApply_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CExpression 源码

greenplumn CExpressionFactorizer 源码

greenplumn CExpressionHandle 源码

greenplumn CExpressionPreprocessor 源码

greenplumn CExpressionUtils 源码

greenplumn CHashedDistributions 源码

greenplumn CLogical 源码

greenplumn CLogicalApply 源码

greenplumn CLogicalAssert 源码

greenplumn CLogicalBitmapTableGet 源码