greenplumn CXformSequenceProject2Apply 源码
greenplumn CXformSequenceProject2Apply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformSequenceProject2Apply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformSequenceProject2Apply.h
//
// @doc:
// Transform Sequence Project to Apply
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformSequenceProject2Apply_H
#define GPOPT_CXformSequenceProject2Apply_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSubqueryUnnest.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformSequenceProject2Apply
//
// @doc:
// Transform Sequence Project to Apply; this transformation is only
// applicable to Sequence Project expression with window functions that
// have subquery arguments
//
//---------------------------------------------------------------------------
class CXformSequenceProject2Apply : public CXformSubqueryUnnest
{
private:
public:
CXformSequenceProject2Apply(const CXformSequenceProject2Apply &) = delete;
// ctor
explicit CXformSequenceProject2Apply(CMemoryPool *mp);
// dtor
~CXformSequenceProject2Apply() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfSequenceProject2Apply;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformSequenceProject2Apply";
}
}; // class CXformSequenceProject2Apply
} // namespace gpopt
#endif // !GPOPT_CXformSequenceProject2Apply_H
// EOF
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