greenplumn CXformProject2Apply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformProject2Apply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformProject2Apply.h
/
/ @doc:
/ Transform Project to Apply
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformProject2Apply_H
#define GPOPT_CXformProject2Apply_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSubqueryUnnest.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformProject2Apply
/
/ @doc:
/ Transform Project to Apply; this transformation is only applicable
/ to a Project expression with subqueries in its scalar project list
/
/---------------------------------------------------------------------------
class CXformProject2Apply : public CXformSubqueryUnnest
{
private:
public:
CXformProject2Apply(const CXformProject2Apply &) = delete;
/ ctor
explicit CXformProject2Apply(CMemoryPool *mp);
/ dtor
~CXformProject2Apply() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfProject2Apply;
}
/ return a string for xform name
const CHAR *
SzId() const override
{
return "CXformProject2Apply";
}
}; / class CXformProject2Apply
} / namespace gpopt
#endif / !GPOPT_CXformProject2Apply_H
/ EOF
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