greenplumn CLogicalRightOuterJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalRightOuterJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (c) 2020 VMware, Inc.
/
/ @filename:
/ CLogicalRightOuterJoin.h
/
/ @doc:
/ Right outer join operator
/---------------------------------------------------------------------------
#ifndef GPOS_CLogicalRightOuterJoin_H
#define GPOS_CLogicalRightOuterJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalJoin.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalRightOuterJoin
/
/ @doc:
/ Right outer join operator
/
/---------------------------------------------------------------------------
class CLogicalRightOuterJoin : public CLogicalJoin
{
private:
public:
CLogicalRightOuterJoin(const CLogicalRightOuterJoin &) = delete;
/ ctor
explicit CLogicalRightOuterJoin(
CMemoryPool *mp, CXform::EXformId origin_xform = CXform::ExfSentinel);
/ dtor
~CLogicalRightOuterJoin() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalRightOuterJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalRightOuterJoin";
}
/ return true if we can pull projections up past this operator from its given child
BOOL
FCanPullProjectionsUp(ULONG child_index) const override
{
return (1 == child_index);
}
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive not nullable output columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *, / mp
CExpressionHandle &exprhdl) const override
{
/ right outer join passes through not null columns from inner child only
/ may have additional children that are ignored, e.g., scalar children
GPOS_ASSERT(1 <= exprhdl.Arity());
CColRefSet *pcrs = exprhdl.DeriveNotNullColumns(1);
pcrs->AddRef();
return pcrs;
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *, /mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintPassThru(exprhdl, 1 /*ulChild*/);
}
/ promise level for stat derivation
EStatPromise
Esp(CExpressionHandle & /exprhdl
) const override
{
/ Disable stats derivation for CLogicalRightOuterJoin because it is
/ currently not implemented. Instead rely on stats coming from the
/ equivalent LOJ expression.
return EspLow;
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalRightOuterJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalRightOuterJoin == pop->Eopid());
return dynamic_cast<CLogicalRightOuterJoin *>(pop);
}
}; / class CLogicalRightOuterJoin
} / namespace gpopt
#endif / !GPOS_CLogicalRightOuterJoin_H
/ EOF
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