greenplumn CLogicalRightOuterJoin 源码
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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