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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