greenplumn CXformLeftAntiSemiJoinNotIn2HashJoinNotIn 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformLeftAntiSemiJoinNotIn2HashJoinNotIn.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CXformLeftAntiSemiJoinNotIn2HashJoinNotIn.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformLeftAntiSemiJoinNotIn2HashJoinNotIn.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoinNotIn.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalLeftAntiSemiHashJoinNotIn.h"
#include "gpopt/operators/CPredicateUtils.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::CXformLeftAntiSemiJoinNotIn2HashJoinNotIn
/
/ @doc:
/ ctor
/
/---------------------------------------------------------------------------
CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::
CXformLeftAntiSemiJoinNotIn2HashJoinNotIn(CMemoryPool *mp)
: / pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalLeftAntiSemiJoinNotIn(mp),
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)), / left child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)), / right child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternTree(mp)) / predicate
))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::Exfp
/
/ @doc:
/ Compute xform promise for a given expression handle;
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::Exfp(
CExpressionHandle &exprhdl) const
{
return CXformUtils::ExfpLogicalJoin2PhysicalJoin(exprhdl);
}
/---------------------------------------------------------------------------
/ @function:
/ CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::Transform
/
/ @doc:
/ actual transformation
/
/---------------------------------------------------------------------------
void
CXformLeftAntiSemiJoinNotIn2HashJoinNotIn::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CXformUtils::ImplementHashJoin<CPhysicalLeftAntiSemiHashJoinNotIn>(
pxfctxt, pxfres, pexpr);
if (pxfres->Pdrgpexpr()->Size() == 0)
{
CExpression *pexprProcessed = nullptr;
if (CXformUtils::FProcessGPDBAntiSemiHashJoin(pxfctxt->Pmp(), pexpr,
&pexprProcessed))
{
/ try again after simplifying join predicate
CXformUtils::ImplementHashJoin<CPhysicalLeftAntiSemiHashJoinNotIn>(
pxfctxt, pxfres, pexprProcessed);
pexprProcessed->Release();
}
}
}
/ EOF
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