mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-23 07:05:36 +03:00
b53c231ca6
This patch improves handling of NULLs in textual fields in ColumnStore. Previously empty strings were considered NULLs and it could be a problem if data scheme allows for empty strings. It was also one of major reasons of behavior difference between ColumnStore and other engines in MariaDB family. Also, this patch fixes some other bugs and incorrect behavior, for example, incorrect comparison for "column <= ''" which evaluates to constant True for all purposes before this patch.
120 lines
3.4 KiB
C++
120 lines
3.4 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_period_diff.cpp 2477 2011-04-01 16:07:35Z rdempsey $
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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_int.h"
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#include "funchelpers.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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#include "dataconvert.h"
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namespace funcexp
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{
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#define YY_PART_YEAR 70
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inline uint64_t convert_period_to_month(uint64_t period)
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{
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uint64_t a, b;
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if (period == 0 || period > 999912)
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return 0L;
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if ((a = period / 100) < YY_PART_YEAR)
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a += 2000;
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else if (a < 100)
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a += 1900;
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b = period % 100;
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return a * 12 + b - 1;
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}
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int64_t getArgSInt64Val(rowgroup::Row& row, TreeNode* exp, bool& isNull)
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{
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switch (exp->resultType().colDataType)
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{
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case execplan::CalpontSystemCatalog::BIGINT:
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case execplan::CalpontSystemCatalog::INT:
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case execplan::CalpontSystemCatalog::MEDINT:
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case execplan::CalpontSystemCatalog::TINYINT:
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case execplan::CalpontSystemCatalog::SMALLINT:
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case execplan::CalpontSystemCatalog::DATE:
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case execplan::CalpontSystemCatalog::DATETIME:
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case execplan::CalpontSystemCatalog::TIMESTAMP: return exp->getIntVal(row, isNull);
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case execplan::CalpontSystemCatalog::DECIMAL:
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case execplan::CalpontSystemCatalog::UDECIMAL:
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{
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IDB_Decimal d = exp->getDecimalVal(row, isNull);
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return d.toSInt64Round();
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}
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case execplan::CalpontSystemCatalog::VARCHAR:
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case execplan::CalpontSystemCatalog::CHAR:
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case execplan::CalpontSystemCatalog::TEXT:
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{
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const auto& str = exp->getStrVal(row, isNull);
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return str.isNull() ? 0 : atoi(str.str());
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}
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case execplan::CalpontSystemCatalog::DOUBLE:
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case execplan::CalpontSystemCatalog::FLOAT:
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{
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datatypes::TDouble d(exp->getDoubleVal(row, isNull));
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return d.toMCSSInt64Round();
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}
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default: isNull = true;
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}
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return 0;
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}
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CalpontSystemCatalog::ColType Func_period_diff::operationType(FunctionParm& fp,
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CalpontSystemCatalog::ColType& resultType)
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{
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return resultType;
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}
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int64_t Func_period_diff::getIntVal(rowgroup::Row& row, FunctionParm& parm, bool& isNull,
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CalpontSystemCatalog::ColType& op_ct)
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{
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uint64_t period1 = (uint64_t)getArgSInt64Val(row, parm[0]->data(), isNull);
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if (isNull)
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return 0;
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uint64_t period2 = (uint64_t)getArgSInt64Val(row, parm[1]->data(), isNull);
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if (isNull)
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return 0;
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return convert_period_to_month(period1) - convert_period_to_month(period2);
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}
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} // namespace funcexp
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