greenplumn CXformImplementSequenceProject 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementSequenceProject.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformImplementSequenceProject.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementSequenceProject.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalSequenceProject.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalSequenceProject.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementSequenceProject::CXformImplementSequenceProject
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformImplementSequenceProject::CXformImplementSequenceProject(CMemoryPool *mp)
: / pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalSequenceProject(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), / relational child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)) / scalar child
))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementSequenceProject::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformImplementSequenceProject::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CMemoryPool *mp = pxfctxt->Pmp();
/ extract components
CExpression *pexprRelational = (*pexpr)[0];
CExpression *pexprScalar = (*pexpr)[1];
/ addref all children
pexprRelational->AddRef();
pexprScalar->AddRef();
/ extract members of logical sequence project operator
CLogicalSequenceProject *popLogicalSequenceProject =
CLogicalSequenceProject::PopConvert(pexpr->Pop());
CDistributionSpec *pds = popLogicalSequenceProject->Pds();
COrderSpecArray *pdrgpos = popLogicalSequenceProject->Pdrgpos();
CWindowFrameArray *pdrgpwf = popLogicalSequenceProject->Pdrgpwf();
pds->AddRef();
pdrgpos->AddRef();
pdrgpwf->AddRef();
/ assemble physical operator
CExpression *pexprSequenceProject = GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPhysicalSequenceProject(mp, pds, pdrgpos, pdrgpwf),
pexprRelational, pexprScalar);
/ add alternative to results
pxfres->Add(pexprSequenceProject);
}
/ EOF
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