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