greenplumn CLogicalGbAgg 源码
greenplumn CLogicalGbAgg 代码
文件路径:/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalGbAgg.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CLogicalGbAgg.h
//
// @doc:
// Group Aggregate operator
//---------------------------------------------------------------------------
#ifndef GPOS_CLogicalGbAgg_H
#define GPOS_CLogicalGbAgg_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalUnary.h"
namespace gpopt
{
// fwd declaration
class CColRefSet;
class CLogicalGbAgg;
//---------------------------------------------------------------------------
// @class:
// CLogicalGbAgg
//
// @doc:
// aggregate operator
//
//---------------------------------------------------------------------------
class CLogicalGbAgg : public CLogicalUnary
{
protected:
// does local / intermediate / global aggregate generate duplicate values for the same group
BOOL m_fGeneratesDuplicates;
// array of columns used in distinct qualified aggregates (DQA)
// used only in the case of intermediate aggregates
CColRefArray *m_pdrgpcrArgDQA;
// compute required stats columns for a GbAgg
CColRefSet *PcrsStatGbAgg(CMemoryPool *mp, CExpressionHandle &exprhdl,
CColRefSet *pcrsInput, ULONG child_index,
CColRefArray *pdrgpcrGrp) const;
public:
CLogicalGbAgg(const CLogicalGbAgg &) = delete;
// the below enum specifically covers only 2 & 3 stage
// scalar dqa, as they are used to find the one having
// better cost context, rest of the aggs falls in others
// category.
enum EAggStage
{
EasTwoStageScalarDQA,
EasThreeStageScalarDQA,
EasOthers,
EasSentinel
};
// ctor
explicit CLogicalGbAgg(CMemoryPool *mp);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
COperator::EGbAggType egbaggtype, EAggStage aggStage);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
COperator::EGbAggType egbaggtype, BOOL fGeneratesDuplicates,
CColRefArray *pdrgpcrArgDQA, EAggStage aggStage);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
COperator::EGbAggType egbaggtype);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
COperator::EGbAggType egbaggtype, BOOL fGeneratesDuplicates,
CColRefArray *pdrgpcrArgDQA);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
CColRefArray *pdrgpcrMinimal,
COperator::EGbAggType egbaggtype);
// ctor
CLogicalGbAgg(CMemoryPool *mp, CColRefArray *colref_array,
CColRefArray *pdrgpcrMinimal,
COperator::EGbAggType egbaggtype, BOOL fGeneratesDuplicates,
CColRefArray *pdrgpcrArgDQA);
// is this part of Two Stage Scalar DQA
BOOL IsTwoStageScalarDQA() const;
// is this part of Three Stage Scalar DQA
BOOL IsThreeStageScalarDQA() const;
// return the m_aggStage
EAggStage
AggStage() const
{
return m_aggStage;
}
// dtor
~CLogicalGbAgg() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalGbAgg;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalGbAgg";
}
// does this aggregate generate duplicate values for the same group
virtual BOOL
FGeneratesDuplicates() const
{
return m_fGeneratesDuplicates;
}
// match function
BOOL Matches(COperator *pop) const override;
// hash function
ULONG HashValue() const override;
// grouping columns accessor
CColRefArray *
Pdrgpcr() const
{
return m_pdrgpcr;
}
// array of columns used in distinct qualified aggregates (DQA)
CColRefArray *
PdrgpcrArgDQA() const
{
return m_pdrgpcrArgDQA;
}
// aggregate type
COperator::EGbAggType
Egbaggtype() const
{
return m_egbaggtype;
}
// is a global aggregate?
BOOL
FGlobal() const
{
return (COperator::EgbaggtypeGlobal == m_egbaggtype);
}
// minimal grouping columns accessor
CColRefArray *
PdrgpcrMinimal() const
{
return m_pdrgpcrMinimal;
}
// return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
//-------------------------------------------------------------------------------------
// Derived Relational Properties
//-------------------------------------------------------------------------------------
// derive output columns
CColRefSet *DeriveOutputColumns(CMemoryPool *,
CExpressionHandle &) override;
// derive outer references
CColRefSet *DeriveOuterReferences(CMemoryPool *mp,
CExpressionHandle &exprhdl) override;
// derive not null columns
CColRefSet *DeriveNotNullColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// derive key collections
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
// derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// derive constraint property
CPropConstraint *DerivePropertyConstraint(
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;
// stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
// conversion function
static CLogicalGbAgg *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalGbAgg == pop->Eopid() ||
EopLogicalGbAggDeduplicate == pop->Eopid());
return dynamic_cast<CLogicalGbAgg *>(pop);
}
// debug print
IOstream &OsPrint(IOstream &os) const override;
// derive statistics
static IStatistics *PstatsDerive(CMemoryPool *mp, IStatistics *child_stats,
CColRefArray *pdrgpcrGroupingCols,
ULongPtrArray *pdrgpulComputedCols,
CBitSet *keys);
// print group by aggregate type
static IOstream &OsPrintGbAggType(IOstream &os,
COperator::EGbAggType egbaggtype);
private:
// array of grouping columns
CColRefArray *m_pdrgpcr;
// minimal grouping columns based on FD's
CColRefArray *m_pdrgpcrMinimal;
// local / intermediate / global aggregate
COperator::EGbAggType m_egbaggtype;
// which type of multi-stage agg it is
EAggStage m_aggStage;
}; // class CLogicalGbAgg
} // namespace gpopt
#endif // !GPOS_CLogicalGbAgg_H
// EOF
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