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99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
/* Copyright (C) 2017 MariaDB Corporaton
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/***********************************************************************
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* $Id$
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*
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* avgx.h
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***********************************************************************/
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/**
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* Columnstore interface for for the avgx function
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*
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*
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* CREATE AGGREGATE FUNCTION avgx returns REAL soname
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* 'libudf_mysql.so';
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*
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*/
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#ifndef HEADER_avgx
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#define HEADER_avgx
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#include <cstdlib>
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#include <string>
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#include <vector>
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#ifdef _MSC_VER
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#include <unordered_map>
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#else
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#include <tr1/unordered_map>
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#endif
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#include "mcsv1_udaf.h"
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#include "calpontsystemcatalog.h"
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#include "windowfunctioncolumn.h"
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using namespace execplan;
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#if defined(_MSC_VER) && defined(xxxRGNODE_DLLEXPORT)
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#define EXPORT __declspec(dllexport)
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#else
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#define EXPORT
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#endif
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namespace mcsv1sdk
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{
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// Override mcsv1_UDAF to build your User Defined Aggregate (UDAF) and/or
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// User Defined Analytic Function (UDAnF).
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// These will be singleton classes, so don't put any instance
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// specific data in here. All instance data is stored in mcsv1Context
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// passed to each user function and retrieved by the getUserData() method.
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//
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// Each API function returns a ReturnCode. If ERROR is returned at any time,
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// the query is aborted, getInterrupted() will begin to return true and the
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// message set in config->setErrorMessage() is returned to MariaDB.
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// Return the avgx value of the dataset
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class avgx : public mcsv1_UDAF
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{
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public:
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// Defaults OK
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avgx() : mcsv1_UDAF() {};
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virtual ~avgx() {};
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virtual ReturnCode init(mcsv1Context* context,
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ColumnDatum* colTypes);
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virtual ReturnCode reset(mcsv1Context* context);
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virtual ReturnCode nextValue(mcsv1Context* context, ColumnDatum* valsIn);
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virtual ReturnCode subEvaluate(mcsv1Context* context, const UserData* valIn);
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virtual ReturnCode evaluate(mcsv1Context* context, static_any::any& valOut);
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virtual ReturnCode dropValue(mcsv1Context* context, ColumnDatum* valsDropped);
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protected:
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};
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}; // namespace
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#undef EXPORT
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#endif // HEADER_.h
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