greenplumn CXformLeftOuterJoin2NLJoin 源码
greenplumn CXformLeftOuterJoin2NLJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftOuterJoin2NLJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformLeftOuterJoin2NLJoin.h
//
// @doc:
// Transform left outer join to left outer NLJ
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftOuterJoin2NLJoin_H
#define GPOPT_CXformLeftOuterJoin2NLJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftOuterJoin2NLJoin
//
// @doc:
// Transform left outer join to left outer NLJ
//
//---------------------------------------------------------------------------
class CXformLeftOuterJoin2NLJoin : public CXformImplementation
{
private:
public:
CXformLeftOuterJoin2NLJoin(const CXformLeftOuterJoin2NLJoin &) = delete;
// ctor
explicit CXformLeftOuterJoin2NLJoin(CMemoryPool *mp);
// dtor
~CXformLeftOuterJoin2NLJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftOuterJoin2NLJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftOuterJoin2NLJoin";
}
// 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 CXformLeftOuterJoin2NLJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftOuterJoin2NLJoin_H
// EOF
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