greenplumn CLogicalConstTableGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalConstTableGet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CLogicalConstTableGet.h
/
/ @doc:
/ Constant table accessor
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalConstTableGet_H
#define GPOPT_CLogicalConstTableGet_H
#include "gpos/base.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/ dynamic array of datum arrays -- array owns elements
using IDatum2dArray = CDynamicPtrArray<IDatumArray, CleanupRelease>;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalConstTableGet
/
/ @doc:
/ Constant table accessor
/
/---------------------------------------------------------------------------
class CLogicalConstTableGet : public CLogical
{
private:
/ array of column descriptors: the schema of the const table
CColumnDescriptorArray *m_pdrgpcoldesc;
/ array of datum arrays
IDatum2dArray *m_pdrgpdrgpdatum;
/ output columns
CColRefArray *m_pdrgpcrOutput;
/ construct column descriptors from column references
static CColumnDescriptorArray *PdrgpcoldescMapping(
CMemoryPool *mp, CColRefArray *colref_array);
public:
CLogicalConstTableGet(const CLogicalConstTableGet &) = delete;
/ ctors
explicit CLogicalConstTableGet(CMemoryPool *mp);
CLogicalConstTableGet(CMemoryPool *mp, CColumnDescriptorArray *pdrgpcoldesc,
IDatum2dArray *pdrgpdrgpdatum);
CLogicalConstTableGet(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
IDatum2dArray *pdrgpdrgpdatum);
/ dtor
~CLogicalConstTableGet() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalConstTableGet;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalConstTableGet";
}
/ col descr accessor
CColumnDescriptorArray *
Pdrgpcoldesc() const
{
return m_pdrgpcoldesc;
}
/ const table values accessor
IDatum2dArray *
Pdrgpdrgpdatum() const
{
return m_pdrgpdrgpdatum;
}
/ accessors
CColRefArray *
PdrgpcrOutput() const
{
return m_pdrgpcrOutput;
}
/ sensitivity to order of inputs
BOOL FInputOrderSensitive() const override;
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) 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 *,
CExpressionHandle &) override;
/ derive max card
CMaxCard DeriveMaxCard(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
{
/ TODO: - Jan 11, 2013; compute constraints based on the
/ datum values in this CTG
return GPOS_NEW(mp) CPropConstraint(
mp, GPOS_NEW(mp) CColRefSetArray(mp), nullptr /*pcnstr*/);
}
/-------------------------------------------------------------------------------------
/ 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(!"CLogicalConstTableGet has no children");
return nullptr;
}
/ derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/ stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspLow;
}
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalConstTableGet *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalConstTableGet == pop->Eopid());
return dynamic_cast<CLogicalConstTableGet *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalConstTableGet
} / namespace gpopt
#endif / !GPOPT_CLogicalConstTableGet_H
/ EOF
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