greenplumn CLogicalCTEAnchor 源码
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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