greenplumn CLogicalRightOuterJoin 源码
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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