greenplumn CXformUnion2UnionAll 源码
greenplumn CXformUnion2UnionAll 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformUnion2UnionAll.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformUnion2UnionAll.cpp
//
// @doc:
// Implementation of the transformation that takes a logical union and
// coverts it into an aggregate over a logical union all
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformUnion2UnionAll.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalGbAgg.h"
#include "gpopt/operators/CLogicalUnion.h"
#include "gpopt/operators/CLogicalUnionAll.h"
#include "gpopt/operators/CPatternMultiLeaf.h"
#include "gpopt/operators/CScalarProjectList.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformUnion2UnionAll::CXformUnion2UnionAll
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformUnion2UnionAll::CXformUnion2UnionAll(CMemoryPool *mp)
: // pattern
CXformExploration(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalUnion(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternMultiLeaf(mp))))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformUnion2UnionAll::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformUnion2UnionAll::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CMemoryPool *mp = pxfctxt->Pmp();
// extract components
CLogicalUnion *popUnion = CLogicalUnion::PopConvert(pexpr->Pop());
CColRefArray *pdrgpcrOutput = popUnion->PdrgpcrOutput();
CColRef2dArray *pdrgpdrgpcrInput = popUnion->PdrgpdrgpcrInput();
CExpressionArray *pdrgpexpr = GPOS_NEW(mp) CExpressionArray(mp);
const ULONG arity = pexpr->Arity();
for (ULONG ul = 0; ul < arity; ul++)
{
CExpression *pexprChild = (*pexpr)[ul];
pexprChild->AddRef();
pdrgpexpr->Append(pexprChild);
}
pdrgpcrOutput->AddRef();
pdrgpdrgpcrInput->AddRef();
// assemble new logical operator
CExpression *pexprUnionAll = GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalUnionAll(mp, pdrgpcrOutput, pdrgpdrgpcrInput),
pdrgpexpr);
pdrgpcrOutput->AddRef();
CExpression *pexprProjList =
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CScalarProjectList(mp),
GPOS_NEW(mp) CExpressionArray(mp));
CExpression *pexprAgg = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp) CLogicalGbAgg(mp, pdrgpcrOutput,
COperator::EgbaggtypeGlobal /*egbaggtype*/),
pexprUnionAll, pexprProjList);
// add alternative to results
pxfres->Add(pexprAgg);
}
// EOF
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