greenplumn CXformGbAgg2StreamAgg 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformGbAgg2StreamAgg.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CXformGbAgg2StreamAgg.h
/
/ @doc:
/ Transform GbAgg to StreamAgg
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformGbAgg2StreamAgg_H
#define GPOPT_CXformGbAgg2StreamAgg_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformGbAgg2StreamAgg
/
/ @doc:
/ Transform GbAgg to Stream Agg
/
/---------------------------------------------------------------------------
class CXformGbAgg2StreamAgg : public CXformImplementation
{
private:
public:
CXformGbAgg2StreamAgg(const CXformGbAgg2StreamAgg &) = delete;
/ ctor
CXformGbAgg2StreamAgg(CMemoryPool *mp);
/ ctor
explicit CXformGbAgg2StreamAgg(CExpression *pexprPattern);
/ dtor
~CXformGbAgg2StreamAgg() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfGbAgg2StreamAgg;
}
/ return a string for xform name
const CHAR *
SzId() const override
{
return "CXformGbAgg2StreamAgg";
}
/ compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
/ actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; / class CXformGbAgg2StreamAgg
} / namespace gpopt
#endif / !GPOPT_CXformGbAgg2StreamAgg_H
/ EOF
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