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86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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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: func_isnull.cpp 3648 2013-03-19 21:33:52Z dhall $
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*
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*
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****************************************************************************/
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#include <cstdlib>
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#include <string>
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#include <sstream>
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using namespace std;
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#include "functor_bool.h"
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#include "functioncolumn.h"
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#include "rowgroup.h"
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using namespace execplan;
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using namespace rowgroup;
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#include "dataconvert.h"
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_isnull::operationType (FunctionParm& fp,
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CalpontSystemCatalog::ColType& resultType)
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{
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// operation type of idb_isnull should be the same as the argument type
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assert (fp.size() == 1);
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return fp[0]->data()->resultType();
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}
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/**
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* getBoolVal API definition
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*
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* This would be the most commonly called API for idb_isnull function
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*/
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bool Func_isnull::getBoolVal(Row& row,
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FunctionParm& parm,
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bool& isNull,
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CalpontSystemCatalog::ColType& op_ct)
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{
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switch (op_ct.colDataType)
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{
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// For the purpose of this function, one does not need to get the value of
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// the argument. One only need to know if the argument is NULL. The passed
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// in parameter isNull will be set if the parameter is evaluated NULL.
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// Please note that before this function returns, isNull should be set to
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// false, otherwise the result of the function would be considered NULL,
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// which is not possible for idb_isnull().
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case CalpontSystemCatalog::DECIMAL:
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case CalpontSystemCatalog::UDECIMAL:
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parm[0]->data()->getDecimalVal(row, isNull);
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break;
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case CalpontSystemCatalog::CHAR:
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case CalpontSystemCatalog::VARCHAR:
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parm[0]->data()->getStrVal(row, isNull);
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break;
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default:
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parm[0]->data()->getIntVal(row, isNull);
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}
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bool ret = isNull;
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// It's important to reset isNull indicator.
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isNull = false;
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return (fIsNotNull? !ret : ret);
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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