greenplumn CLogicalGbAggDeduplicate 源码

greenplumn CLogicalGbAggDeduplicate 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2013 VMware, Inc. or its affiliates.
//
//	@filename:
//		CLogicalGbAggDeduplicate.h
//
//	@doc:
//		Group Aggregate operator for deduplicating join outputs. This is used
//		for example when we transform left semijoin to inner join. E.g. the
//		following expression:
//			LSJ
//			|-- A
//			|-- B
//			+-- A.a1 <> B.b1
//		can be transformed to:
//			GbAggDedup (group on keys of A)
//			+-- InnerJoin
//				|-- A
//				|-- B
//				+-- A.a1 <> B.b1
//---------------------------------------------------------------------------
#ifndef GPOS_CLogicalGbAggDeduplicate_H
#define GPOS_CLogicalGbAggDeduplicate_H

#include "gpos/base.h"

#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalGbAgg.h"

namespace gpopt
{
//---------------------------------------------------------------------------
//	@class:
//		CLogicalGbAggDeduplicate
//
//	@doc:
//		aggregate operator for deduplicating join outputs
//
//---------------------------------------------------------------------------
class CLogicalGbAggDeduplicate : public CLogicalGbAgg
{
private:
	// array of keys from the join's child
	CColRefArray *m_pdrgpcrKeys;

public:
	CLogicalGbAggDeduplicate(const CLogicalGbAggDeduplicate &) = delete;

	// ctor
	explicit CLogicalGbAggDeduplicate(CMemoryPool *mp);

	// ctor
	CLogicalGbAggDeduplicate(CMemoryPool *mp, CColRefArray *colref_array,
							 COperator::EGbAggType egbaggtype,
							 CColRefArray *pdrgpcrKeys = nullptr);

	// ctor
	CLogicalGbAggDeduplicate(CMemoryPool *mp, CColRefArray *colref_array,
							 CColRefArray *pdrgpcrMinimal,
							 COperator::EGbAggType egbaggtype,
							 CColRefArray *pdrgpcrKeys = nullptr);

	// dtor
	~CLogicalGbAggDeduplicate() override;

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

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

	// array of keys from the join's child that needs to be deduped
	CColRefArray *
	PdrgpcrKeys() const
	{
		return m_pdrgpcrKeys;
	}

	// match function
	BOOL Matches(COperator *pop) const override;

	// hash function
	ULONG HashValue() const override;

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

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

	// derive key collections
	CKeyCollection *DeriveKeyCollection(
		CMemoryPool *mp, CExpressionHandle &exprhdl) const override;

	// compute required stats columns of the n-th child
	//-------------------------------------------------------------------------------------
	// Required Relational Properties
	//-------------------------------------------------------------------------------------

	// compute required stat columns of the n-th child
	CColRefSet *PcrsStat(CMemoryPool *mp, CExpressionHandle &exprhdl,
						 CColRefSet *pcrsInput,
						 ULONG child_index) const override;

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

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

	// derive statistics
	IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
							  IStatisticsArray *stats_ctxt) const override;

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

	// conversion function
	static CLogicalGbAggDeduplicate *
	PopConvert(COperator *pop)
	{
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(EopLogicalGbAggDeduplicate == pop->Eopid());

		return dynamic_cast<CLogicalGbAggDeduplicate *>(pop);
	}


	// debug print
	IOstream &OsPrint(IOstream &os) const override;

};	// class CLogicalGbAggDeduplicate

}  // namespace gpopt


#endif	// !GPOS_CLogicalGbAggDeduplicate_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