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75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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Copyright (C) 2019 MariaDB Corporation
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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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// $Id: functor_export.h 3495 2013-01-21 14:09:51Z rdempsey $
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/** @file */
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#pragma once
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#include "functor.h"
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#include <utility>
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#include <vector>
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namespace funcexp
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{
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/** @brief Func_rand class
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* This function is exported, so visible to FunctionColumn in dbcon.
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*/
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class Func_rand : public Func
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{
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public:
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Func_rand() : Func("rand"), fSeed1(0), fSeed2(0), fSeedSet(false)
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{
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}
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~Func_rand() override = default;
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double getRand();
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execplan::CalpontSystemCatalog::ColType operationType(
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FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType) override;
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int64_t getIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
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execplan::CalpontSystemCatalog::ColType& op_ct) override
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{
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return ((int64_t)getDoubleVal(row, fp, isNull, op_ct));
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}
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double getDoubleVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
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execplan::CalpontSystemCatalog::ColType& op_ct) override;
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long double getLongDoubleVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
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execplan::CalpontSystemCatalog::ColType& op_ct) override
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{
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return (long double)getDoubleVal(row, fp, isNull, op_ct);
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}
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std::string getStrVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
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execplan::CalpontSystemCatalog::ColType& op_ct) override
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{
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return doubleToString(getDoubleVal(row, fp, isNull, op_ct));
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}
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private:
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uint64_t fSeed1;
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uint64_t fSeed2;
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bool fSeedSet;
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};
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} // namespace funcexp
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