greenplumn CXformImplementSplit 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementSplit.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformImplementSplit.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementSplit.h"
#include "gpos/base.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalSplit.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalSplit.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementSplit::CXformImplementSplit
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformImplementSplit::CXformImplementSplit(CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalSplit(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementSplit::Exfp
/
/ @doc:
/ Compute promise of xform
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformImplementSplit::Exfp(CExpressionHandle &exprhdl) const
{
if (exprhdl.DeriveHasSubquery(1))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformImplementSplit::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformImplementSplit::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalSplit *popSplit = CLogicalSplit::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ extract components for alternative
CColRefArray *pdrgpcrDelete = popSplit->PdrgpcrDelete();
pdrgpcrDelete->AddRef();
CColRefArray *pdrgpcrInsert = popSplit->PdrgpcrInsert();
pdrgpcrInsert->AddRef();
CColRef *pcrAction = popSplit->PcrAction();
CColRef *pcrCtid = popSplit->PcrCtid();
CColRef *pcrSegmentId = popSplit->PcrSegmentId();
/ child of Split operator
CExpression *pexprChild = (*pexpr)[0];
CExpression *pexprProjList = (*pexpr)[1];
pexprChild->AddRef();
pexprProjList->AddRef();
/ create physical Split
CExpression *pexprAlt = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp) CPhysicalSplit(mp, pdrgpcrDelete, pdrgpcrInsert, pcrCtid,
pcrSegmentId, pcrAction),
pexprChild, pexprProjList);
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码