greenplumn CXformImplementFullOuterMergeJoin 源码
greenplumn CXformImplementFullOuterMergeJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementFullOuterMergeJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2019 VMware, Inc. or its affiliates.
#include "gpopt/xforms/CXformImplementFullOuterMergeJoin.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalFullOuterJoin.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalFullMergeJoin.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
// ctor
CXformImplementFullOuterMergeJoin::CXformImplementFullOuterMergeJoin(
CMemoryPool *mp)
: CXformExploration(
// pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalFullOuterJoin(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // outer child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // inner child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)) // scalar child
))
{
}
CXform::EXformPromise
CXformImplementFullOuterMergeJoin::Exfp(CExpressionHandle &exprhdl) const
{
if (exprhdl.DeriveHasSubquery(2))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
void
CXformImplementFullOuterMergeJoin::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CXformUtils::ImplementMergeJoin<CPhysicalFullMergeJoin>(pxfctxt, pxfres,
pexpr);
}
// EOF
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