greenplumn CXformImplementRowTrigger 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementRowTrigger.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformImplementRowTrigger.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementRowTrigger.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalRowTrigger.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalRowTrigger.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementRowTrigger::CXformImplementRowTrigger
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformImplementRowTrigger::CXformImplementRowTrigger(CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalRowTrigger(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementRowTrigger::Exfp
/
/ @doc:
/ Compute promise of xform
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformImplementRowTrigger::Exfp(CExpressionHandle & / exprhdl
) const
{
return CXform::ExfpHigh;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementRowTrigger::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformImplementRowTrigger::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalRowTrigger *popRowTrigger =
CLogicalRowTrigger::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ extract components for alternative
IMDId *rel_mdid = popRowTrigger->GetRelMdId();
rel_mdid->AddRef();
INT type = popRowTrigger->GetType();
CColRefArray *pdrgpcrOld = popRowTrigger->PdrgpcrOld();
if (nullptr != pdrgpcrOld)
{
pdrgpcrOld->AddRef();
}
CColRefArray *pdrgpcrNew = popRowTrigger->PdrgpcrNew();
if (nullptr != pdrgpcrNew)
{
pdrgpcrNew->AddRef();
}
/ child of RowTrigger operator
CExpression *pexprChild = (*pexpr)[0];
pexprChild->AddRef();
/ create physical RowTrigger
CExpression *pexprAlt = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp)
CPhysicalRowTrigger(mp, rel_mdid, type, pdrgpcrOld, pdrgpcrNew),
pexprChild);
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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