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mariadb-columnstore-engine/utils/funcexp/func_floor.cpp
Gagan Goel 973e5024d8 MCOL-4957 Fix performance slowdown for processing TIMESTAMP columns. 
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.
2022-02-14 14:12:27 -05:00

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/* Copyright (C) 2014 InfiniDB, Inc.
Copyright (C) 2019 MariaDB Corporation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2 of
the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
// $Id: func_floor.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
#include <cstdlib>
#include <iomanip>
#include <string>
using namespace std;
#include "functor_real.h"
#include "functioncolumn.h"
using namespace execplan;
#include "rowgroup.h"
using namespace rowgroup;
#include "errorcodes.h"
#include "idberrorinfo.h"
#include "errorids.h"
using namespace logging;
using namespace dataconvert;
#include "funchelpers.h"
namespace funcexp
{
CalpontSystemCatalog::ColType Func_floor::operationType(FunctionParm& fp,
CalpontSystemCatalog::ColType& resultType)
{
return fp[0]->data()->resultType();
}
int64_t Func_floor::getIntVal(Row& row, FunctionParm& parm, bool& isNull,
CalpontSystemCatalog::ColType& op_ct)
{
int64_t ret = 0;
switch (op_ct.colDataType)
{
case execplan::CalpontSystemCatalog::BIGINT:
case execplan::CalpontSystemCatalog::INT:
case execplan::CalpontSystemCatalog::MEDINT:
case execplan::CalpontSystemCatalog::TINYINT:
case execplan::CalpontSystemCatalog::SMALLINT:
{
ret = parm[0]->data()->getIntVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::UBIGINT:
case execplan::CalpontSystemCatalog::UINT:
case execplan::CalpontSystemCatalog::UMEDINT:
case execplan::CalpontSystemCatalog::UTINYINT:
case execplan::CalpontSystemCatalog::USMALLINT:
{
ret = (int64_t)parm[0]->data()->getUintVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::DOUBLE:
case execplan::CalpontSystemCatalog::UDOUBLE:
case execplan::CalpontSystemCatalog::FLOAT:
case execplan::CalpontSystemCatalog::UFLOAT:
{
ret = (int64_t)floor(parm[0]->data()->getDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::LONGDOUBLE:
{
ret = (int64_t)floorl(parm[0]->data()->getLongDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::VARCHAR:
case execplan::CalpontSystemCatalog::CHAR:
case execplan::CalpontSystemCatalog::TEXT:
{
const string& str = parm[0]->data()->getStrVal(row, isNull);
if (!isNull)
ret = (int64_t)floor(strtod(str.c_str(), 0));
}
break;
case execplan::CalpontSystemCatalog::DATE:
{
// For some reason, MDB doesn't return this as a date,
// but datetime is returned as a datetime. Expect
// this to change in the future.
Date d(parm[0]->data()->getDateIntVal(row, isNull));
if (!isNull)
ret = d.convertToMySQLint();
}
break;
case execplan::CalpontSystemCatalog::DATETIME:
{
ret = parm[0]->data()->getDatetimeIntVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::TIMESTAMP:
{
ret = parm[0]->data()->getTimestampIntVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::TIME:
{
ret = parm[0]->data()->getTimeIntVal(row, isNull);
}
break;
// floor(decimal(X,Y)) leads to this path if X, Y allows to
// downcast to INT otherwise Func_floor::getDecimalVal() is called
case CalpontSystemCatalog::DECIMAL:
case CalpontSystemCatalog::UDECIMAL:
{
ret = parm[0]->data()->getDecimalVal(row, isNull).toSInt64Floor();
break;
}
default:
{
std::ostringstream oss;
oss << "floor: datatype of " << execplan::colDataTypeToString(op_ct.colDataType);
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
}
return ret;
}
uint64_t Func_floor::getUintVal(Row& row, FunctionParm& parm, bool& isNull,
CalpontSystemCatalog::ColType& op_ct)
{
int64_t ret = 0;
switch (op_ct.colDataType)
{
case execplan::CalpontSystemCatalog::BIGINT:
case execplan::CalpontSystemCatalog::INT:
case execplan::CalpontSystemCatalog::MEDINT:
case execplan::CalpontSystemCatalog::TINYINT:
case execplan::CalpontSystemCatalog::SMALLINT:
{
ret = parm[0]->data()->getIntVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::UBIGINT:
case execplan::CalpontSystemCatalog::UINT:
case execplan::CalpontSystemCatalog::UMEDINT:
case execplan::CalpontSystemCatalog::UTINYINT:
case execplan::CalpontSystemCatalog::USMALLINT:
{
ret = (int64_t)parm[0]->data()->getUintVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::DOUBLE:
case execplan::CalpontSystemCatalog::UDOUBLE:
case execplan::CalpontSystemCatalog::FLOAT:
case execplan::CalpontSystemCatalog::UFLOAT:
{
ret = (uint64_t)floor(parm[0]->data()->getDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::LONGDOUBLE:
{
ret = (uint64_t)floorl(parm[0]->data()->getLongDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::VARCHAR:
case execplan::CalpontSystemCatalog::CHAR:
case execplan::CalpontSystemCatalog::TEXT:
{
const string& str = parm[0]->data()->getStrVal(row, isNull);
if (!isNull)
ret = (uint64_t)floor(strtod(str.c_str(), 0));
}
break;
case execplan::CalpontSystemCatalog::DATE:
{
string str = DataConvert::dateToString1(parm[0]->data()->getDateIntVal(row, isNull));
if (!isNull)
ret = strtoull(str.c_str(), NULL, 10);
}
break;
case execplan::CalpontSystemCatalog::DATETIME:
{
string str = DataConvert::datetimeToString1(parm[0]->data()->getDatetimeIntVal(row, isNull));
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret = strtoull(str.c_str(), NULL, 10);
}
break;
case execplan::CalpontSystemCatalog::TIMESTAMP:
{
string str =
DataConvert::timestampToString1(parm[0]->data()->getTimestampIntVal(row, isNull), op_ct.getTimeZone());
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret = strtoull(str.c_str(), NULL, 10);
}
break;
case execplan::CalpontSystemCatalog::TIME:
{
string str = DataConvert::timeToString1(parm[0]->data()->getTimeIntVal(row, isNull));
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret = strtoull(str.c_str(), NULL, 10);
}
break;
case CalpontSystemCatalog::DECIMAL:
case CalpontSystemCatalog::UDECIMAL:
{
ret = parm[0]->data()->getDecimalVal(row, isNull).toUInt64Floor();
break;
}
default:
{
std::ostringstream oss;
oss << "floor: datatype of " << execplan::colDataTypeToString(op_ct.colDataType);
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
}
return ret;
}
double Func_floor::getDoubleVal(Row& row, FunctionParm& parm, bool& isNull,
CalpontSystemCatalog::ColType& op_ct)
{
double ret = 0.0;
if (op_ct.colDataType == CalpontSystemCatalog::DOUBLE || op_ct.colDataType == CalpontSystemCatalog::FLOAT)
{
ret = floor(parm[0]->data()->getDoubleVal(row, isNull));
}
else if (op_ct.colDataType == CalpontSystemCatalog::LONGDOUBLE)
{
ret = floorl(parm[0]->data()->getLongDoubleVal(row, isNull));
}
else if (op_ct.colDataType == CalpontSystemCatalog::VARCHAR ||
op_ct.colDataType == CalpontSystemCatalog::CHAR || op_ct.colDataType == CalpontSystemCatalog::TEXT)
{
const string& str = parm[0]->data()->getStrVal(row, isNull);
if (!isNull)
ret = floor(strtod(str.c_str(), 0));
}
else if (op_ct.colDataType == CalpontSystemCatalog::DECIMAL ||
op_ct.colDataType == CalpontSystemCatalog::UDECIMAL)
{
IDB_Decimal tmp = getDecimalVal(row, parm, isNull, op_ct);
if (op_ct.colWidth == datatypes::MAXDECIMALWIDTH)
{
ret = static_cast<double>(tmp.toTSInt128());
}
else
{
ret = (double)tmp.value;
}
}
else
{
ret = (double)getIntVal(row, parm, isNull, op_ct);
}
return ret;
}
long double Func_floor::getLongDoubleVal(Row& row, FunctionParm& parm, bool& isNull,
CalpontSystemCatalog::ColType& op_ct)
{
long double ret = 0.0;
if (op_ct.colDataType == CalpontSystemCatalog::LONGDOUBLE ||
op_ct.colDataType == CalpontSystemCatalog::FLOAT)
{
ret = floor(parm[0]->data()->getDoubleVal(row, isNull));
}
else if (op_ct.colDataType == CalpontSystemCatalog::LONGDOUBLE)
{
ret = floorl(parm[0]->data()->getLongDoubleVal(row, isNull));
}
else if (op_ct.colDataType == CalpontSystemCatalog::VARCHAR ||
op_ct.colDataType == CalpontSystemCatalog::CHAR || op_ct.colDataType == CalpontSystemCatalog::TEXT)
{
const string& str = parm[0]->data()->getStrVal(row, isNull);
if (!isNull)
ret = floor(strtod(str.c_str(), 0));
}
else if (op_ct.colDataType == CalpontSystemCatalog::DECIMAL ||
op_ct.colDataType == CalpontSystemCatalog::UDECIMAL)
{
IDB_Decimal tmp = getDecimalVal(row, parm, isNull, op_ct);
if (op_ct.colWidth == datatypes::MAXDECIMALWIDTH)
{
ret = static_cast<long double>(tmp.toTSInt128());
}
else
{
ret = (long double)tmp.value;
}
}
else
{
ret = (long double)getIntVal(row, parm, isNull, op_ct);
}
return ret;
}
string Func_floor::getStrVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType& op_ct)
{
char tmp[512] = {'\0'};
if (op_ct.colDataType == CalpontSystemCatalog::DOUBLE ||
op_ct.colDataType == CalpontSystemCatalog::UDOUBLE ||
op_ct.colDataType == CalpontSystemCatalog::FLOAT || op_ct.colDataType == CalpontSystemCatalog::UFLOAT ||
op_ct.colDataType == CalpontSystemCatalog::VARCHAR || op_ct.colDataType == CalpontSystemCatalog::CHAR ||
op_ct.colDataType == CalpontSystemCatalog::TEXT)
{
snprintf(tmp, 511, "%f", getDoubleVal(row, parm, isNull, op_ct));
// remove the decimals in the oss string.
char* d = tmp;
while ((*d != '.') && (*d != '\0'))
d++;
*d = '\0';
}
if (op_ct.colDataType == CalpontSystemCatalog::LONGDOUBLE)
{
snprintf(tmp, 511, "%Lf", getLongDoubleVal(row, parm, isNull, op_ct));
// remove the decimals in the oss string.
char* d = tmp;
while ((*d != '.') && (*d != '\0'))
d++;
*d = '\0';
}
else if (op_ct.colDataType == CalpontSystemCatalog::DECIMAL ||
op_ct.colDataType == CalpontSystemCatalog::UDECIMAL)
{
IDB_Decimal d = getDecimalVal(row, parm, isNull, op_ct);
if (op_ct.colWidth == datatypes::MAXDECIMALWIDTH)
{
return d.toString(true);
}
else
{
return d.toString();
}
}
else if (isUnsigned(op_ct.colDataType))
{
#ifndef __LP64__
snprintf(tmp, 511, "%llu", getUintVal(row, parm, isNull, op_ct));
#else
snprintf(tmp, 511, "%lu", getUintVal(row, parm, isNull, op_ct));
#endif
}
else
{
#ifndef __LP64__
snprintf(tmp, 511, "%lld", getIntVal(row, parm, isNull, op_ct));
#else
snprintf(tmp, 511, "%ld", getIntVal(row, parm, isNull, op_ct));
#endif
}
return string(tmp);
}
IDB_Decimal Func_floor::getDecimalVal(Row& row, FunctionParm& parm, bool& isNull,
CalpontSystemCatalog::ColType& op_ct)
{
IDB_Decimal ret;
switch (op_ct.colDataType)
{
case execplan::CalpontSystemCatalog::BIGINT:
case execplan::CalpontSystemCatalog::INT:
case execplan::CalpontSystemCatalog::MEDINT:
case execplan::CalpontSystemCatalog::TINYINT:
case execplan::CalpontSystemCatalog::SMALLINT:
{
ret.value = parm[0]->data()->getIntVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::DECIMAL:
case execplan::CalpontSystemCatalog::UDECIMAL:
{
ret = parm[0]->data()->getDecimalVal(row, isNull);
if (isNull)
break;
// negative scale is not supported by CNX yet
if (ret.scale > 0)
{
if (ret.scale > datatypes::INT128MAXPRECISION)
{
std::ostringstream oss;
oss << "floor: datatype of " << execplan::colDataTypeToString(op_ct.colDataType) << " with scale "
<< (int)ret.scale << " is beyond supported scale";
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
return ret.floor();
}
}
break;
case execplan::CalpontSystemCatalog::UBIGINT:
case execplan::CalpontSystemCatalog::UINT:
case execplan::CalpontSystemCatalog::UMEDINT:
case execplan::CalpontSystemCatalog::UTINYINT:
case execplan::CalpontSystemCatalog::USMALLINT:
{
ret.value = (int64_t)parm[0]->data()->getUintVal(row, isNull);
}
break;
case execplan::CalpontSystemCatalog::DOUBLE:
case execplan::CalpontSystemCatalog::UDOUBLE:
case execplan::CalpontSystemCatalog::FLOAT:
case execplan::CalpontSystemCatalog::UFLOAT:
{
ret.value = (int64_t)floor(parm[0]->data()->getDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::LONGDOUBLE:
{
ret.value = (int64_t)floorl(parm[0]->data()->getLongDoubleVal(row, isNull));
}
break;
case execplan::CalpontSystemCatalog::VARCHAR:
case execplan::CalpontSystemCatalog::CHAR:
case execplan::CalpontSystemCatalog::TEXT:
{
const string& str = parm[0]->data()->getStrVal(row, isNull);
if (!isNull)
ret.value = (int64_t)floor(strtod(str.c_str(), 0));
}
break;
case execplan::CalpontSystemCatalog::DATE:
{
string str = DataConvert::dateToString1(parm[0]->data()->getDateIntVal(row, isNull));
if (!isNull)
ret.value = atoll(str.c_str());
}
break;
case execplan::CalpontSystemCatalog::DATETIME:
{
string str = DataConvert::datetimeToString1(parm[0]->data()->getDatetimeIntVal(row, isNull));
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret.value = atoll(str.c_str());
}
break;
case execplan::CalpontSystemCatalog::TIMESTAMP:
{
string str =
DataConvert::timestampToString1(parm[0]->data()->getTimestampIntVal(row, isNull), op_ct.getTimeZone());
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret.value = atoll(str.c_str());
}
break;
case execplan::CalpontSystemCatalog::TIME:
{
string str = DataConvert::timeToString1(parm[0]->data()->getTimeIntVal(row, isNull));
// strip off micro seconds
str = str.substr(0, 14);
if (!isNull)
ret.value = atoll(str.c_str());
}
break;
default:
{
std::ostringstream oss;
oss << "floor: datatype of " << execplan::colDataTypeToString(op_ct.colDataType);
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
}
ret.scale = 0;
return ret;
}
} // namespace funcexp
// vim:ts=4 sw=4:
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