greenplumn CLogicalCTEAnchor 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalCTEAnchor.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CLogicalCTEAnchor.h
/
/ @doc:
/ Logical CTE anchor operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalCTEAnchor_H
#define GPOPT_CLogicalCTEAnchor_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogical.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalCTEAnchor
/
/ @doc:
/ CTE anchor operator
/
/---------------------------------------------------------------------------
class CLogicalCTEAnchor : public CLogical
{
private:
/ cte identifier
ULONG m_id;
public:
CLogicalCTEAnchor(const CLogicalCTEAnchor &) = delete;
/ ctor
explicit CLogicalCTEAnchor(CMemoryPool *mp);
/ ctor
CLogicalCTEAnchor(CMemoryPool *mp, ULONG id);
/ dtor
~CLogicalCTEAnchor() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalCTEAnchor;
}
const CHAR *
SzId() const override
{
return "CLogicalCTEAnchor";
}
/ cte identifier
ULONG
Id() const
{
return m_id;
}
/ 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
{
return PopCopyDefault();
}
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive output columns
CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) override;
/ dervive keys
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, /mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintPassThru(exprhdl, 0 /*ulChild*/);
}
/ derive partition consumer info
CPartInfo *DerivePartitionInfo(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ 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);
}
/ derive statistics
IStatistics *
PstatsDerive(CMemoryPool *, /mp,
CExpressionHandle &exprhdl,
IStatisticsArray * /stats_ctxt
) const override
{
return PstatsPassThruOuter(exprhdl);
}
/ stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalCTEAnchor *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalCTEAnchor == pop->Eopid());
return dynamic_cast<CLogicalCTEAnchor *>(pop);
}
/ debug print
IOstream &OsPrint(IOstream &) const override;
}; / class CLogicalCTEAnchor
} / namespace gpopt
#endif / !GPOPT_CLogicalCTEAnchor_H
/ EOF
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