greenplumn CXformRemoveSubqDistinct 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformRemoveSubqDistinct.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2017 VMware, Inc. or its affiliates.
/
/ @filename:
/ CXformRemoveSubqDistinct.h
/
/ @doc:
/ Transform that removes distinct clause from subquery
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformRemoveSubqDistinct_H
#define GPOPT_CXformRemoveSubqDistinct_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSimplifySubquery.h"
namespace gpopt
{
using namespace gpos;
class CXformRemoveSubqDistinct : public CXformExploration
{
private:
public:
CXformRemoveSubqDistinct(const CXformRemoveSubqDistinct &) = delete;
/ ctor
explicit CXformRemoveSubqDistinct(CMemoryPool *mp);
/ dtor
~CXformRemoveSubqDistinct() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfRemoveSubqDistinct;
}
/ return a string for xform name
const CHAR *
SzId() const override
{
return "CXformRemoveSubqDistinct";
}
/ 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 CXformRemoveSubqDistinct
} / namespace gpopt
#endif / !GPOPT_CXformRemoveSubqDistinct_H
/ EOF
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