greenplumn CLogicalExternalGet 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CLogicalExternalGet.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 VMware, Inc. or its affiliates.
/
/ @filename:
/ CLogicalExternalGet.cpp
/
/ @doc:
/ Implementation of external get
/---------------------------------------------------------------------------
#include "gpopt/operators/CLogicalExternalGet.h"
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CColRefSetIter.h"
#include "gpopt/base/CColRefTable.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/base/CUtils.h"
#include "gpopt/metadata/CName.h"
#include "gpopt/metadata/CTableDescriptor.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::CLogicalExternalGet
/
/ @doc:
/ Ctor - for pattern
/
/---------------------------------------------------------------------------
CLogicalExternalGet::CLogicalExternalGet(CMemoryPool *mp) : CLogicalGet(mp)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::CLogicalExternalGet
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CLogicalExternalGet::CLogicalExternalGet(CMemoryPool *mp,
const CName *pnameAlias,
CTableDescriptor *ptabdesc)
: CLogicalGet(mp, pnameAlias, ptabdesc)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::CLogicalExternalGet
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CLogicalExternalGet::CLogicalExternalGet(CMemoryPool *mp,
const CName *pnameAlias,
CTableDescriptor *ptabdesc,
CColRefArray *pdrgpcrOutput)
: CLogicalGet(mp, pnameAlias, ptabdesc, pdrgpcrOutput)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::Matches
/
/ @doc:
/ Match function on operator level
/
/---------------------------------------------------------------------------
BOOL
CLogicalExternalGet::Matches(COperator *pop) const
{
if (pop->Eopid() != Eopid())
{
return false;
}
CLogicalExternalGet *popGet = CLogicalExternalGet::PopConvert(pop);
return Ptabdesc() == popGet->Ptabdesc() &&
PdrgpcrOutput()->Equals(popGet->PdrgpcrOutput());
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::PopCopyWithRemappedColumns
/
/ @doc:
/ Return a copy of the operator with remapped columns
/
/---------------------------------------------------------------------------
COperator *
CLogicalExternalGet::PopCopyWithRemappedColumns(
CMemoryPool *mp, UlongToColRefMap *colref_mapping, BOOL must_exist)
{
CColRefArray *pdrgpcrOutput = nullptr;
if (must_exist)
{
pdrgpcrOutput =
CUtils::PdrgpcrRemapAndCreate(mp, PdrgpcrOutput(), colref_mapping);
}
else
{
pdrgpcrOutput = CUtils::PdrgpcrRemap(mp, PdrgpcrOutput(),
colref_mapping, must_exist);
}
CName *pnameAlias = GPOS_NEW(mp) CName(mp, Name());
CTableDescriptor *ptabdesc = Ptabdesc();
ptabdesc->AddRef();
return GPOS_NEW(mp)
CLogicalExternalGet(mp, pnameAlias, ptabdesc, pdrgpcrOutput);
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalExternalGet::PxfsCandidates
/
/ @doc:
/ Get candidate xforms
/
/---------------------------------------------------------------------------
CXformSet *
CLogicalExternalGet::PxfsCandidates(CMemoryPool *mp) const
{
CXformSet *xform_set = GPOS_NEW(mp) CXformSet(mp);
(void) xform_set->ExchangeSet(CXform::ExfExternalGet2ExternalScan);
return xform_set;
}
/ EOF
相关信息
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码