greenplumn CXformInsert2DML 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformInsert2DML.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformInsert2DML.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformInsert2DML.h"
#include "gpos/base.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalInsert.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformInsert2DML::CXformInsert2DML
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformInsert2DML::CXformInsert2DML(CMemoryPool *mp)
: CXformExploration(
/ pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalInsert(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformInsert2DML::Exfp
/
/ @doc:
/ Compute promise of xform
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformInsert2DML::Exfp(CExpressionHandle & / exprhdl
) const
{
return CXform::ExfpHigh;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformInsert2DML::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformInsert2DML::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalInsert *popInsert = CLogicalInsert::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ extract components for alternative
CTableDescriptor *ptabdesc = popInsert->Ptabdesc();
ptabdesc->AddRef();
CColRefArray *pdrgpcrSource = popInsert->PdrgpcrSource();
pdrgpcrSource->AddRef();
/ child of insert operator
CExpression *pexprChild = (*pexpr)[0];
pexprChild->AddRef();
/ create logical DML
CExpression *pexprAlt = CXformUtils::PexprLogicalDMLOverProject(
mp, pexprChild, CLogicalDML::EdmlInsert, ptabdesc, pdrgpcrSource,
nullptr, /pcrCtid
nullptr /pcrSegmentId
);
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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