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
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码