greenplumn CLogicalInnerJoin 源码
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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