greenplumn CXformUnion2UnionAll 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformUnion2UnionAll.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformUnion2UnionAll.h
/
/ @doc:
/ Transform logical union into an aggregate over a logical union all
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformUnion2UnionAll_H
#define GPOPT_CXformUnion2UnionAll_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformUnion2UnionAll
/
/ @doc:
/ Transform logical union into an aggregate over a logical union all
/
/---------------------------------------------------------------------------
class CXformUnion2UnionAll : public CXformExploration
{
private:
public:
CXformUnion2UnionAll(const CXformUnion2UnionAll &) = delete;
/ ctor
explicit CXformUnion2UnionAll(CMemoryPool *mp);
/ dtor
~CXformUnion2UnionAll() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfUnion2UnionAll;
}
const CHAR *
SzId() const override
{
return "CXformUnion2UnionAll";
}
/ compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & / exprhdl
) const override
{
return CXform::ExfpHigh;
}
/ actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; / class CXformUnion2UnionAll
} / namespace gpopt
#endif / !GPOPT_CXformUnion2UnionAll_H
/ EOF
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