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https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
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973e5024d8
Part 1: As part of MCOL-3776 to address synchronization issue while accessing the fTimeZone member of the Func class, mutex locks were added to the accessor and mutator methods. However, this slows down processing of TIMESTAMP columns in PrimProc significantly as all threads across all concurrently running queries would serialize on the mutex. This is because PrimProc only has a single global object for the functor class (class derived from Func in utils/funcexp/functor.h) for a given function name. To fix this problem: (1) We remove the fTimeZone as a member of the Func derived classes (hence removing the mutexes) and instead use the fOperationType member of the FunctionColumn class to propagate the timezone values down to the individual functor processing functions such as FunctionColumn::getStrVal(), FunctionColumn::getIntVal(), etc. (2) To achieve (1), a timezone member is added to the execplan::CalpontSystemCatalog::ColType class. Part 2: Several functors in the Funcexp code call dataconvert::gmtSecToMySQLTime() and dataconvert::mySQLTimeToGmtSec() functions for conversion between seconds since unix epoch and broken-down representation. These functions in turn call the C library function localtime_r() which currently has a known bug of holding a global lock via a call to __tz_convert. This significantly reduces performance in multi-threaded applications where multiple threads concurrently call localtime_r(). More details on the bug: https://sourceware.org/bugzilla/show_bug.cgi?id=16145 This bug in localtime_r() caused processing of the Functors in PrimProc to slowdown significantly since a query execution causes Functors code to be processed in a multi-threaded manner. As a fix, we remove the calls to localtime_r() from gmtSecToMySQLTime() and mySQLTimeToGmtSec() by performing the timezone-to-offset conversion (done in dataconvert::timeZoneToOffset()) during the execution plan creation in the plugin. Note that localtime_r() is only called when the time_zone system variable is set to "SYSTEM". This fix also required changing the timezone type from a std::string to a long across the system.
258 lines
7.9 KiB
C++
258 lines
7.9 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_extract.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
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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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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 "intervalcolumn.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
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{
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using namespace funcexp;
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long long dateGet(uint64_t time, IntervalColumn::interval_type unit, bool dateType)
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{
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uint64_t year = 0, month = 0, day = 0, hour = 0, min = 0, sec = 0, msec = 0;
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if (dateType)
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{
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year = (uint32_t)((time >> 16) & 0xffff);
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month = (uint32_t)((time >> 12) & 0xf);
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day = (uint32_t)((time >> 6) & 0x3f);
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}
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else
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{
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year = (uint32_t)((time >> 48) & 0xffff);
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month = (uint32_t)((time >> 44) & 0xf);
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day = (uint32_t)((time >> 38) & 0x3f);
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hour = (uint32_t)((time >> 32) & 0x3f);
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min = (uint32_t)((time >> 26) & 0x3f);
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sec = (uint32_t)((time >> 20) & 0x3f);
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msec = (uint32_t)((time & 0xfffff));
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}
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switch (unit)
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{
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case IntervalColumn::INTERVAL_YEAR: return year;
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case IntervalColumn::INTERVAL_MONTH: return month;
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case IntervalColumn::INTERVAL_DAY: return day;
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case IntervalColumn::INTERVAL_HOUR: return hour;
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case IntervalColumn::INTERVAL_MINUTE: return min;
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case IntervalColumn::INTERVAL_SECOND: return sec;
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case IntervalColumn::INTERVAL_MICROSECOND: return msec;
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case IntervalColumn::INTERVAL_QUARTER: return month / 4 + 1;
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case IntervalColumn::INTERVAL_WEEK: return helpers::calc_mysql_week(year, month, day, 0);
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case IntervalColumn::INTERVAL_YEAR_MONTH: return (year * 100) + month;
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case IntervalColumn::INTERVAL_DAY_HOUR: return (day * 100) + hour;
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case IntervalColumn::INTERVAL_DAY_MINUTE: return (day * 10000) + (hour * 100) + min;
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case IntervalColumn::INTERVAL_DAY_SECOND: return (day * 1000000) + (hour * 10000) + (min * 100) + sec;
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case IntervalColumn::INTERVAL_HOUR_MINUTE: return (hour * 100) + min;
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case IntervalColumn::INTERVAL_HOUR_SECOND: return (hour * 10000) + (min * 100) + sec;
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case IntervalColumn::INTERVAL_MINUTE_SECOND: return (min * 100) + sec;
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case IntervalColumn::INTERVAL_DAY_MICROSECOND:
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return (((day * 1000000) + (hour * 10000) + (min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_HOUR_MICROSECOND:
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return (((hour * 10000) + (min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_MINUTE_MICROSECOND: return (((min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_SECOND_MICROSECOND: return (sec * 1000000) + msec;
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default: throw runtime_error(std::string("unit type is not supported: ") + std::to_string(unit));
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};
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}
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long long timeGet(uint64_t time, IntervalColumn::interval_type unit)
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{
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int32_t hour = 0, min = 0, sec = 0, msec = 0, day = 0;
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min = (int32_t)((time >> 32) & 0xff);
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sec = (int32_t)((time >> 24) & 0xff);
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msec = (int32_t)((time & 0xfffff));
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// If negative, mask so it doesn't turn positive
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int64_t mask = 0;
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if ((time >> 40) & 0x800)
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mask = 0xfffffffffffff000;
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hour = mask | ((time >> 40) & 0xfff);
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if ((hour >= 0) && (time >> 63))
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hour *= -1;
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// Always positive!
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day = abs(hour / 24);
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switch (unit)
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{
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case IntervalColumn::INTERVAL_YEAR:
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case IntervalColumn::INTERVAL_MONTH: return 0;
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case IntervalColumn::INTERVAL_DAY: return day;
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case IntervalColumn::INTERVAL_HOUR: return hour;
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case IntervalColumn::INTERVAL_MINUTE: return min;
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case IntervalColumn::INTERVAL_SECOND: return sec;
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case IntervalColumn::INTERVAL_MICROSECOND: return msec;
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case IntervalColumn::INTERVAL_QUARTER:
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case IntervalColumn::INTERVAL_WEEK:
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case IntervalColumn::INTERVAL_YEAR_MONTH: return 0;
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case IntervalColumn::INTERVAL_DAY_HOUR: return (day * 100) + hour;
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case IntervalColumn::INTERVAL_DAY_MINUTE: return (day * 10000) + (hour * 100) + min;
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case IntervalColumn::INTERVAL_DAY_SECOND: return (day * 1000000) + (hour * 10000) + (min * 100) + sec;
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case IntervalColumn::INTERVAL_HOUR_MINUTE: return (hour * 100) + min;
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case IntervalColumn::INTERVAL_HOUR_SECOND: return (hour * 10000) + (min * 100) + sec;
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case IntervalColumn::INTERVAL_MINUTE_SECOND: return (min * 100) + sec;
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case IntervalColumn::INTERVAL_DAY_MICROSECOND:
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return (((day * 1000000) + (hour * 10000) + (min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_HOUR_MICROSECOND:
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return (((hour * 10000) + (min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_MINUTE_MICROSECOND: return (((min * 100) + sec) * 1000000) + msec;
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case IntervalColumn::INTERVAL_SECOND_MICROSECOND: return (sec * 1000000) + msec;
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default: throw runtime_error(std::string("unit type is not supported: ") + std::to_string(unit));
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};
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};
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} // namespace
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_extract::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_extract::getIntVal(rowgroup::Row& row, FunctionParm& parm, bool& isNull,
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CalpontSystemCatalog::ColType& ct)
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{
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IntervalColumn::interval_type unit =
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static_cast<IntervalColumn::interval_type>(parm[1]->data()->getIntVal(row, isNull));
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uint64_t time;
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bool isTime = false;
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//@bug4678 handle conversion from non date/datetime datatype
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switch (parm[0]->data()->resultType().colDataType)
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{
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case CalpontSystemCatalog::DATE:
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case CalpontSystemCatalog::DATETIME: time = parm[0]->data()->getDatetimeIntVal(row, isNull); break;
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case CalpontSystemCatalog::TIMESTAMP:
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{
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dataconvert::TimeStamp timestamp(parm[0]->data()->getTimestampIntVal(row, isNull));
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int64_t seconds = timestamp.second;
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dataconvert::MySQLTime m_time;
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dataconvert::gmtSecToMySQLTime(seconds, m_time, ct.getTimeZone());
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dataconvert::DateTime dt;
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dt.year = m_time.year;
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dt.month = m_time.month;
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dt.day = m_time.day;
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dt.hour = m_time.hour;
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dt.minute = m_time.minute;
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dt.second = m_time.second;
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dt.msecond = timestamp.msecond;
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time = *(reinterpret_cast<uint64_t*>(&dt));
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break;
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}
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case CalpontSystemCatalog::TIME:
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time = parm[0]->data()->getTimeIntVal(row, isNull);
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isTime = true;
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break;
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case CalpontSystemCatalog::VARCHAR:
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case CalpontSystemCatalog::CHAR:
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case CalpontSystemCatalog::TEXT:
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{
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const string& val = parm[0]->data()->getStrVal(row, isNull);
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time = dataconvert::DataConvert::stringToDatetime(val);
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break;
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}
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case CalpontSystemCatalog::INT:
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case CalpontSystemCatalog::TINYINT:
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case CalpontSystemCatalog::MEDINT:
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case CalpontSystemCatalog::BIGINT:
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case CalpontSystemCatalog::SMALLINT:
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{
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int64_t val = parm[0]->data()->getIntVal(row, isNull);
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time = dataconvert::DataConvert::intToDatetime(val);
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break;
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}
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default: time = parm[0]->data()->getIntVal(row, isNull);
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}
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long long value;
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if (isTime)
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value = timeGet(time, unit);
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else
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value = dateGet(time, unit, false);
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return value;
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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