greenplumn CXformImplementRowTrigger 源码
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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