greenplumn CXformGbAgg2Apply 源码
greenplumn CXformGbAgg2Apply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformGbAgg2Apply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformGbAgg2Apply.h
//
// @doc:
// Transform GbAgg to Apply
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformGbAgg2Apply_H
#define GPOPT_CXformGbAgg2Apply_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSubqueryUnnest.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformGbAgg2Apply
//
// @doc:
// Transform GbAgg to Apply; this transformation is only applicable
// to GbAgg expression with aggregate functions that have subquery
// arguments
//
//---------------------------------------------------------------------------
class CXformGbAgg2Apply : public CXformSubqueryUnnest
{
private:
public:
CXformGbAgg2Apply(const CXformGbAgg2Apply &) = delete;
// ctor
explicit CXformGbAgg2Apply(CMemoryPool *mp);
// dtor
~CXformGbAgg2Apply() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfGbAgg2Apply;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformGbAgg2Apply";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
}; // class CXformGbAgg2Apply
} // namespace gpopt
#endif // !GPOPT_CXformGbAgg2Apply_H
// EOF
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