greenplumn CXformImplementPartitionSelector 源码
greenplumn CXformImplementPartitionSelector 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementPartitionSelector.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformImplementPartitionSelector.cpp
//
// @doc:
// Implementation of transform
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementPartitionSelector.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalPartitionSelector.h"
#include "gpopt/operators/CPatternLeaf.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformImplementPartitionSelector::CXformImplementPartitionSelector
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformImplementPartitionSelector::CXformImplementPartitionSelector(
CMemoryPool *mp)
: // pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalPartitionSelector(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)) // relational child
))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementPartitionSelector::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformImplementPartitionSelector::Transform(CXformContext *pxfctxt,
CXformResult *pxfres GPOS_UNUSED,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CMemoryPool *mp = pxfctxt->Pmp();
// extract components
CLogicalPartitionSelector *popSelector =
CLogicalPartitionSelector::PopConvert(pexpr->Pop());
CExpression *pexprRelational = (*pexpr)[0];
IMDId *mdid = popSelector->MDId();
// addref all components
pexprRelational->AddRef();
mdid->AddRef();
UlongToExprMap *phmulexprFilter = GPOS_NEW(mp) UlongToExprMap(mp);
const ULONG ulLevels = popSelector->UlPartLevels();
for (ULONG ul = 0; ul < ulLevels; ul++)
{
CExpression *pexprFilter = popSelector->PexprPartFilter(ul);
GPOS_ASSERT(nullptr != pexprFilter);
pexprFilter->AddRef();
BOOL fInserted GPOS_ASSERTS_ONLY =
phmulexprFilter->Insert(GPOS_NEW(mp) ULONG(ul), pexprFilter);
GPOS_ASSERT(fInserted);
}
}
// EOF
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