greenplumn CXformPushGbWithHavingBelowJoin 源码
greenplumn CXformPushGbWithHavingBelowJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformPushGbWithHavingBelowJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformPushGbWithHavingBelowJoin.h
//
// @doc:
// Push group by with having clause below join transform
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformPushGbWithHavingBelowJoin_H
#define GPOPT_CXformPushGbWithHavingBelowJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformPushGbWithHavingBelowJoin
//
// @doc:
// Push group by with having clause below join transform
//
//---------------------------------------------------------------------------
class CXformPushGbWithHavingBelowJoin : public CXformExploration
{
private:
public:
CXformPushGbWithHavingBelowJoin(const CXformPushGbWithHavingBelowJoin &) =
delete;
// ctor
explicit CXformPushGbWithHavingBelowJoin(CMemoryPool *mp);
// dtor
~CXformPushGbWithHavingBelowJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfPushGbWithHavingBelowJoin;
}
const CHAR *
SzId() const override
{
return "CXformPushGbWithHavingBelowJoin";
}
// 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 CXformPushGbWithHavingBelowJoin
} // namespace gpopt
#endif // !GPOPT_CXformPushGbWithHavingBelowJoin_H
// EOF
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