greenplumn CXformLeftJoin2RightJoin 源码
greenplumn CXformLeftJoin2RightJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftJoin2RightJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (c) 2020 VMware, Inc.
//
// @filename:
// CXformLeftJoin2RightJoin.h
//
// @doc:
// Transform left outer join to right outer join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftJoin2RightJoin_H
#define GPOPT_CXformLeftJoin2RightJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftJoin2RightJoin
//
// @doc:
// Transform left outer join to right outer join
//
//---------------------------------------------------------------------------
class CXformLeftJoin2RightJoin : public CXformExploration
{
private:
public:
CXformLeftJoin2RightJoin(const CXformLeftJoin2RightJoin &) = delete;
// ctor
explicit CXformLeftJoin2RightJoin(CMemoryPool *mp);
// dtor
~CXformLeftJoin2RightJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftJoin2RightJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftJoin2RightJoin";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformLeftJoin2RightJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftJoin2RightJoin_H
// EOF
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