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70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/* Copyright (C) 2021 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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#include <string>
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using namespace std;
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#include "functor_str.h"
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#include "functioncolumn.h"
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using namespace execplan;
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#include "rowgroup.h"
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using namespace rowgroup;
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#include "dataconvert.h"
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using namespace dataconvert;
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_concat_oracle::operationType(FunctionParm& fp,
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CalpontSystemCatalog::ColType& /*resultType*/)
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{
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// operation type is not used by this functor
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return fp[0]->data()->resultType();
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}
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// Returns the string that results from concatenating the arguments.
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// concat_oracle() returns NULL all arguments are NULL.
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// single arguments null is replaced by "".
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//
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string Func_concat_oracle::getStrVal(Row& row, FunctionParm& parm, bool& isNull,
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CalpontSystemCatalog::ColType&)
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{
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string ret;
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string tmp;
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// we default to true as any non-NULL operand will reset it to false
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// and all NULL operands will leave it as true, which is intended.
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isNull = true;
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// TODO: do a better job of cutting down the number re-allocations.
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// look at Item_func_concat::realloc_result for ideas and use
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// std::string:resize() appropriatly.
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for (unsigned int id = 0; id < parm.size(); id++)
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{
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bool tempIsNull = false;
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stringValue(parm[id], row, tempIsNull, tmp);
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if (!tempIsNull)
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{
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isNull = false;
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ret.append(tmp);
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}
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}
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return ret;
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}
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} // namespace funcexp
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