greenplumn CLogicalDelete 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalDelete.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CLogicalDelete.h
/
/ @doc:
/ Logical Delete operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalDelete_H
#define GPOPT_CLogicalDelete_H
#include "gpos/base.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/ fwd declarations
class CTableDescriptor;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalDelete
/
/ @doc:
/ Logical Delete operator
/
/---------------------------------------------------------------------------
class CLogicalDelete : public CLogical
{
private:
/ table descriptor
CTableDescriptor *m_ptabdesc;
/ columns to delete
CColRefArray *m_pdrgpcr;
/ ctid column
CColRef *m_pcrCtid;
/ segmentId column
CColRef *m_pcrSegmentId;
public:
CLogicalDelete(const CLogicalDelete &) = delete;
/ ctor
explicit CLogicalDelete(CMemoryPool *mp);
/ ctor
CLogicalDelete(CMemoryPool *mp, CTableDescriptor *ptabdesc,
CColRefArray *colref_array, CColRef *pcrCtid,
CColRef *pcrSegmentId);
/ dtor
~CLogicalDelete() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalDelete;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalDelete";
}
/ columns to delete
CColRefArray *
Pdrgpcr() const
{
return m_pdrgpcr;
}
/ ctid column
CColRef *
PcrCtid() const
{
return m_pcrCtid;
}
/ segmentId column
CColRef *
PcrSegmentId() const
{
return m_pcrSegmentId;
}
/ return table's descriptor
CTableDescriptor *
Ptabdesc() const
{
return m_ptabdesc;
}
/ 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 false;
}
/ 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 PcrsStatsPassThru(pcrsInput);
}
/-------------------------------------------------------------------------------------
/ 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 CLogicalDelete *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalDelete == pop->Eopid());
return dynamic_cast<CLogicalDelete *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalDelete
} / namespace gpopt
#endif / !GPOPT_CLogicalDelete_H
/ EOF
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