greenplumn CLogicalRightOuterJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CLogicalRightOuterJoin.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (c) 2020 VMware, Inc.
/
/ @filename:
/ CLogicalRightOuterJoin.cpp
/
/ @doc:
/ Implementation of right outer join operator
/---------------------------------------------------------------------------
#include "gpopt/operators/CLogicalRightOuterJoin.h"
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/operators/CExpression.h"
#include "gpopt/operators/CExpressionHandle.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CLogicalRightOuterJoin::CLogicalRightOuterJoin
/
/ @doc:
/ ctor
/
/---------------------------------------------------------------------------
CLogicalRightOuterJoin::CLogicalRightOuterJoin(CMemoryPool *mp,
CXform::EXformId origin_xform)
: CLogicalJoin(mp, origin_xform)
{
GPOS_ASSERT(nullptr != mp);
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalRightOuterJoin::DeriveMaxCard
/
/ @doc:
/ Derive max card
/
/---------------------------------------------------------------------------
CMaxCard
CLogicalRightOuterJoin::DeriveMaxCard(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const
{
CMaxCard maxCardOuter = exprhdl.DeriveMaxCard(0);
CMaxCard maxCard = exprhdl.DeriveMaxCard(1);
/ if the outer has a max card of 0, that will not make the ROJ's
/ max card go to 0
if (0 < maxCardOuter.Ull())
{
maxCard *= maxCardOuter;
}
return CLogical::Maxcard(exprhdl, 2 /*ulScalarIndex*/, maxCard);
}
/---------------------------------------------------------------------------
/ @function:
/ CLogicalRightOuterJoin::PxfsCandidates
/
/ @doc:
/ Get candidate xforms
/
/---------------------------------------------------------------------------
CXformSet *
CLogicalRightOuterJoin::PxfsCandidates(CMemoryPool *mp) const
{
CXformSet *xform_set = GPOS_NEW(mp) CXformSet(mp);
(void) xform_set->ExchangeSet(CXform::ExfRightOuterJoin2HashJoin);
return xform_set;
}
/ EOF
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