greenplumn CXformUnion2UnionAll 源码
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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