greenplumn CLogicalGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalGet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CLogicalGet.h
/
/ @doc:
/ Basic table accessor
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalGet_H
#define GPOPT_CLogicalGet_H
#include "gpos/base.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/ fwd declarations
class CTableDescriptor;
class CName;
class CColRefSet;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalGet
/
/ @doc:
/ Basic table accessor
/
/---------------------------------------------------------------------------
class CLogicalGet : public CLogical
{
private:
/ alias for table
const CName *m_pnameAlias;
/ table descriptor
CTableDescriptor *m_ptabdesc;
/ output columns
CColRefArray *m_pdrgpcrOutput;
/ partition keys
CColRef2dArray *m_pdrgpdrgpcrPart;
/ distribution columns (empty for master only tables)
CColRefSet *m_pcrsDist;
void CreatePartCols(CMemoryPool *mp, const ULongPtrArray *pdrgpulPart);
/ private copy ctor
CLogicalGet(const CLogicalGet &);
public:
/ ctors
explicit CLogicalGet(CMemoryPool *mp);
CLogicalGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc);
CLogicalGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc, CColRefArray *pdrgpcrOutput);
/ dtor
~CLogicalGet() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalGet;
}
/ distribution columns
virtual const CColRefSet *
PcrsDist() const
{
return m_pcrsDist;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalGet";
}
/ accessors
CColRefArray *
PdrgpcrOutput() const
{
return m_pdrgpcrOutput;
}
/ return table's name
const CName &
Name() const
{
return *m_pnameAlias;
}
/ return table's descriptor
CTableDescriptor *
Ptabdesc() const
{
return m_ptabdesc;
}
/ partition columns
CColRef2dArray *
PdrgpdrgpcrPartColumns() const
{
return m_pdrgpdrgpcrPart;
}
/ 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 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 not nullable output columns
CColRefSet *DeriveNotNullColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive partition consumer info
CPartInfo *
DerivePartitionInfo(CMemoryPool *mp,
CExpressionHandle & / exprhdl
) const override
{
return GPOS_NEW(mp) CPartInfo(mp);
}
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *mp,
CExpressionHandle & / exprhdl
) const override
{
return PpcDeriveConstraintFromTable(mp, m_ptabdesc, m_pdrgpcrOutput);
}
/ derive join depth
ULONG
DeriveJoinDepth(CMemoryPool *, / mp
CExpressionHandle & / exprhdl
) const override
{
return 1;
}
/ derive table descriptor
CTableDescriptor *
DeriveTableDescriptor(CMemoryPool *, / mp
CExpressionHandle & / exprhdl
) const override
{
return m_ptabdesc;
}
/-------------------------------------------------------------------------------------
/ 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
{
GPOS_ASSERT(!"CLogicalGet has no children");
return nullptr;
}
/-------------------------------------------------------------------------------------
/ 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 CLogicalGet *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalGet == pop->Eopid() ||
EopLogicalExternalGet == pop->Eopid());
return dynamic_cast<CLogicalGet *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalGet
} / namespace gpopt
#endif / !GPOPT_CLogicalGet_H
/ EOF
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