greenplumn CXformCollapseGbAgg 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformCollapseGbAgg.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CXformCollapseGbAgg.h
/
/ @doc:
/ Collapse two cascaded GbAgg operators into a single GbAgg
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformCollapseGbAgg_H
#define GPOPT_CXformCollapseGbAgg_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformCollapseGbAgg
/
/ @doc:
/ Collapse two cascaded GbAgg operators into a single GbAgg
/
/---------------------------------------------------------------------------
class CXformCollapseGbAgg : public CXformExploration
{
private:
public:
CXformCollapseGbAgg(const CXformCollapseGbAgg &) = delete;
/ ctor
explicit CXformCollapseGbAgg(CMemoryPool *mp);
/ dtor
~CXformCollapseGbAgg() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfCollapseGbAgg;
}
/ return a string for xform name
const CHAR *
SzId() const override
{
return "CXformCollapseGbAgg";
}
/ compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
/ actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; / class CXformCollapseGbAgg
} / namespace gpopt
#endif / !GPOPT_CXformCollapseGbAgg_H
/ EOF
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