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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