greenplumn CXformImplementDML 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementDML.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformImplementDML.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementDML.h"
#include "gpos/base.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalDML.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalDML.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementDML::CXformImplementDML
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformImplementDML::CXformImplementDML(CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalDML(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementDML::Exfp
/
/ @doc:
/ Compute promise of xform
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformImplementDML::Exfp(CExpressionHandle & / exprhdl
) const
{
return CXform::ExfpHigh;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementDML::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformImplementDML::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalDML *popDML = CLogicalDML::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ extract components for alternative
CLogicalDML::EDMLOperator edmlop = popDML->Edmlop();
CTableDescriptor *ptabdesc = popDML->Ptabdesc();
ptabdesc->AddRef();
CColRefArray *pdrgpcrSource = popDML->PdrgpcrSource();
pdrgpcrSource->AddRef();
CBitSet *pbsModified = popDML->PbsModified();
pbsModified->AddRef();
CColRef *pcrAction = popDML->PcrAction();
CColRef *pcrTableOid = popDML->PcrTableOid();
CColRef *pcrCtid = popDML->PcrCtid();
CColRef *pcrSegmentId = popDML->PcrSegmentId();
BOOL fSplit = popDML->FSplit();
/ child of DML operator
CExpression *pexprChild = (*pexpr)[0];
pexprChild->AddRef();
/ create physical DML
CExpression *pexprAlt = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp)
CPhysicalDML(mp, edmlop, ptabdesc, pdrgpcrSource, pbsModified,
pcrAction, pcrTableOid, pcrCtid, pcrSegmentId, fSplit),
pexprChild);
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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