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