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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