greenplumn CXformImplementConstTableGet 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementConstTableGet.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformImplementConstTableGet.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementConstTableGet.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalConstTableGet.h"
#include "gpopt/operators/CPhysicalConstTableGet.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementConstTableGet::CXformImplementConstTableGet
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformImplementConstTableGet::CXformImplementConstTableGet(CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CLogicalConstTableGet(mp)))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementConstTableGet::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformImplementConstTableGet::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalConstTableGet *popConstTableGet =
CLogicalConstTableGet::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ create/extract components for alternative
CColumnDescriptorArray *pdrgpcoldesc = popConstTableGet->Pdrgpcoldesc();
pdrgpcoldesc->AddRef();
IDatum2dArray *pdrgpdrgpdatum = popConstTableGet->Pdrgpdrgpdatum();
pdrgpdrgpdatum->AddRef();
CColRefArray *pdrgpcrOutput = popConstTableGet->PdrgpcrOutput();
pdrgpcrOutput->AddRef();
/ create alternative expression
CExpression *pexprAlt = GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPhysicalConstTableGet(
mp, pdrgpcoldesc, pdrgpdrgpdatum, pdrgpcrOutput));
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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