greenplumn CXformSelect2Apply 源码
greenplumn CXformSelect2Apply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformSelect2Apply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformSelect2Apply.h
//
// @doc:
// Transform Select to Apply
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformSelect2Apply_H
#define GPOPT_CXformSelect2Apply_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSubqueryUnnest.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformSelect2Apply
//
// @doc:
// Transform Select to Apply; this transformation is only applicable
// to a Select expression with subqueries in its scalar predicate
//
//---------------------------------------------------------------------------
class CXformSelect2Apply : public CXformSubqueryUnnest
{
private:
public:
CXformSelect2Apply(const CXformSelect2Apply &) = delete;
// ctor
explicit CXformSelect2Apply(CMemoryPool *mp);
// dtor
~CXformSelect2Apply() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfSelect2Apply;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformSelect2Apply";
}
}; // class CXformSelect2Apply
} // namespace gpopt
#endif // !GPOPT_CXformSelect2Apply_H
// EOF
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