greenplumn CLogicalSplit 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalSplit.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CLogicalSplit.h
/
/ @doc:
/ Logical split operator used for DML updates
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalSplit_H
#define GPOPT_CLogicalSplit_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/ fwd declarations
class CTableDescriptor;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalSplit
/
/ @doc:
/ Logical split operator
/
/---------------------------------------------------------------------------
class CLogicalSplit : public CLogical
{
private:
/ deletion columns
CColRefArray *m_pdrgpcrDelete;
/ insertion columns
CColRefArray *m_pdrgpcrInsert;
/ ctid column
CColRef *m_pcrCtid;
/ segmentId column
CColRef *m_pcrSegmentId;
/ action column
CColRef *m_pcrAction;
public:
CLogicalSplit(const CLogicalSplit &) = delete;
/ ctor
explicit CLogicalSplit(CMemoryPool *mp);
/ ctor
CLogicalSplit(CMemoryPool *mp, CColRefArray *pdrgpcrDelete,
CColRefArray *pdrgpcrInsert, CColRef *pcrCtid,
CColRef *pcrSegmentId, CColRef *pcrAction);
/ dtor
~CLogicalSplit() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalSplit;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalSplit";
}
/ deletion columns
CColRefArray *
PdrgpcrDelete() const
{
return m_pdrgpcrDelete;
}
/ insertion columns
CColRefArray *
PdrgpcrInsert() const
{
return m_pdrgpcrInsert;
}
/ ctid column
CColRef *
PcrCtid() const
{
return m_pcrCtid;
}
/ segmentId column
CColRef *
PcrSegmentId() const
{
return m_pcrSegmentId;
}
/ action column
CColRef *
PcrAction() const
{
return m_pcrAction;
}
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
/ 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 *mp,
CExpressionHandle &exprhdl) override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
return CLogical::PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive partition consumer info
CPartInfo *
DerivePartitionInfo(CMemoryPool *, / mp,
CExpressionHandle &exprhdl) const override
{
return PpartinfoPassThruOuter(exprhdl);
}
/ compute required stats columns of the n-th child
CColRefSet *
PcrsStat(CMemoryPool *mp, CExpressionHandle &exprhdl, CColRefSet *pcrsInput,
ULONG child_index) const override
{
return PcrsReqdChildStats(mp, exprhdl, pcrsInput,
exprhdl.DeriveUsedColumns(1), child_index);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/ derive key collections
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) 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 CLogicalSplit *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalSplit == pop->Eopid());
return dynamic_cast<CLogicalSplit *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalSplit
} / namespace gpopt
#endif / !GPOPT_CLogicalSplit_H
/ EOF
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