greenplumn CXformAntiSemiJoinSemiJoinSwap 源码
greenplumn CXformAntiSemiJoinSemiJoinSwap 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformAntiSemiJoinSemiJoinSwap.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformAntiSemiJoinSemiJoinSwap.h
//
// @doc:
// Swap cascaded anti semi-join and semi-join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformAntiSemiJoinSemiJoinSwap_H
#define GPOPT_CXformAntiSemiJoinSemiJoinSwap_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/operators/CLogicalLeftSemiJoin.h"
#include "gpopt/xforms/CXformJoinSwap.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformAntiSemiJoinSemiJoinSwap
//
// @doc:
// Swap cascaded anti semi-join and semi-join
//
//---------------------------------------------------------------------------
class CXformAntiSemiJoinSemiJoinSwap
: public CXformJoinSwap<CLogicalLeftAntiSemiJoin, CLogicalLeftSemiJoin>
{
private:
public:
CXformAntiSemiJoinSemiJoinSwap(const CXformAntiSemiJoinSemiJoinSwap &) =
delete;
// ctor
explicit CXformAntiSemiJoinSemiJoinSwap(CMemoryPool *mp)
: CXformJoinSwap<CLogicalLeftAntiSemiJoin, CLogicalLeftSemiJoin>(mp)
{
}
// dtor
~CXformAntiSemiJoinSemiJoinSwap() override = default;
// Compatibility function
BOOL
FCompatible(CXform::EXformId exfid) override
{
return ExfSemiJoinAntiSemiJoinSwap != exfid;
}
// ident accessors
EXformId
Exfid() const override
{
return ExfAntiSemiJoinSemiJoinSwap;
}
const CHAR *
SzId() const override
{
return "CXformAntiSemiJoinSemiJoinSwap";
}
}; // class CXformAntiSemiJoinSemiJoinSwap
} // namespace gpopt
#endif // !GPOPT_CXformAntiSemiJoinSemiJoinSwap_H
// EOF
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