greenplumn CXformGbAggDedup2HashAggDedup 源码
greenplumn CXformGbAggDedup2HashAggDedup 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformGbAggDedup2HashAggDedup.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CXformGbAggDedup2HashAggDedup.cpp
//
// @doc:
// Implementation of transform
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformGbAggDedup2HashAggDedup.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalGbAggDeduplicate.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalHashAggDeduplicate.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformGbAggDedup2HashAggDedup::CXformGbAggDedup2HashAggDedup
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformGbAggDedup2HashAggDedup::CXformGbAggDedup2HashAggDedup(CMemoryPool *mp)
: CXformGbAgg2HashAgg(
// pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalGbAggDeduplicate(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformGbAggDedup2HashAggDedup::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformGbAggDedup2HashAggDedup::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();
CLogicalGbAggDeduplicate *popAggDedup =
CLogicalGbAggDeduplicate::PopConvert(pexpr->Pop());
CColRefArray *colref_array = popAggDedup->Pdrgpcr();
colref_array->AddRef();
CColRefArray *pdrgpcrKeys = popAggDedup->PdrgpcrKeys();
pdrgpcrKeys->AddRef();
// extract components
CExpression *pexprRel = (*pexpr)[0];
CExpression *pexprScalar = (*pexpr)[1];
GPOS_ASSERT(0 == pexprScalar->Arity());
// addref children
pexprRel->AddRef();
pexprScalar->AddRef();
// create alternative expression
CExpression *pexprAlt = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp) CPhysicalHashAggDeduplicate(
mp, colref_array, popAggDedup->PdrgpcrMinimal(),
popAggDedup->Egbaggtype(), pdrgpcrKeys,
popAggDedup->FGeneratesDuplicates(),
CXformUtils::FMultiStageAgg(pexpr),
CXformUtils::FAggGenBySplitDQAXform(pexpr), popAggDedup->AggStage(),
!CXformUtils::FLocalAggCreatedByEagerAggXform(pexpr)),
pexprRel, pexprScalar);
// add alternative to transformation result
pxfres->Add(pexprAlt);
}
// EOF
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