greenplumn CLogicalExternalGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalExternalGet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 VMware, Inc. or its affiliates.
/
/ @filename:
/ CLogicalExternalGet.h
/
/ @doc:
/ Logical external get operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalExternalGet_H
#define GPOPT_CLogicalExternalGet_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalGet.h"
namespace gpopt
{
/ fwd declarations
class CTableDescriptor;
class CName;
class CColRefSet;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalExternalGet
/
/ @doc:
/ Logical external get operator
/
/---------------------------------------------------------------------------
class CLogicalExternalGet : public CLogicalGet
{
private:
public:
CLogicalExternalGet(const CLogicalExternalGet &) = delete;
/ ctors
explicit CLogicalExternalGet(CMemoryPool *mp);
CLogicalExternalGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc);
CLogicalExternalGet(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc,
CColRefArray *pdrgpcrOutput);
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalExternalGet;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalExternalGet";
}
/ 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;
/-------------------------------------------------------------------------------------
/ 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(!"CLogicalExternalGet has no children");
return nullptr;
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalExternalGet *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalExternalGet == pop->Eopid());
return dynamic_cast<CLogicalExternalGet *>(pop);
}
}; / class CLogicalExternalGet
} / namespace gpopt
#endif / !GPOPT_CLogicalExternalGet_H
/ EOF
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