greenplumn CLogicalInnerJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalInnerJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CLogicalInnerJoin.h
/
/ @doc:
/ Inner join operator
/---------------------------------------------------------------------------
#ifndef GPOS_CLogicalInnerJoin_H
#define GPOS_CLogicalInnerJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalJoin.h"
namespace gpopt
{
/ fwd declaration
class CColRefSet;
/---------------------------------------------------------------------------
/ @class:
/ CLogicalInnerJoin
/
/ @doc:
/ Inner join operator
/
/---------------------------------------------------------------------------
class CLogicalInnerJoin : public CLogicalJoin
{
private:
public:
CLogicalInnerJoin(const CLogicalInnerJoin &) = delete;
/ ctor
explicit CLogicalInnerJoin(
CMemoryPool *mp, CXform::EXformId origin_xform = CXform::ExfSentinel);
/ dtor
~CLogicalInnerJoin() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalInnerJoin;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalInnerJoin";
}
/-------------------------------------------------------------------------------------
/ Derived Relational Properties
/-------------------------------------------------------------------------------------
/ derive not nullable columns
CColRefSet *
DeriveNotNullColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PcrsDeriveNotNullCombineLogical(mp, exprhdl);
}
/ derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive constraint property
CPropConstraint *
DerivePropertyConstraint(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PpcDeriveConstraintFromPredicates(mp, exprhdl);
}
/-------------------------------------------------------------------------------------
/ Transformations
/-------------------------------------------------------------------------------------
/ candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CLogicalInnerJoin *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalInnerJoin == pop->Eopid());
return dynamic_cast<CLogicalInnerJoin *>(pop);
}
/ determine if an innerJoin group expression has
/ less conjuncts than another
static BOOL FFewerConj(CMemoryPool *mp, CGroupExpression *pgexprFst,
CGroupExpression *pgexprSnd);
}; / class CLogicalInnerJoin
} / namespace gpopt
#endif / !GPOS_CLogicalInnerJoin_H
/ EOF
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