mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-20 09:07:44 +03:00
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
|
|
|
|
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_reverse.cpp 2477 2011-04-01 16:07:35Z rdempsey $
|
|
*
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <string>
|
|
using namespace std;
|
|
|
|
#include "functor_str.h"
|
|
#include "functioncolumn.h"
|
|
using namespace execplan;
|
|
|
|
#include "rowgroup.h"
|
|
using namespace rowgroup;
|
|
|
|
#include "joblisttypes.h"
|
|
using namespace joblist;
|
|
|
|
#define STRCOLL_ENH__
|
|
|
|
namespace
|
|
{
|
|
|
|
void reverse( char* start, char* end )
|
|
{
|
|
while ( start < end )
|
|
{
|
|
char c = *start;
|
|
*start++ = *end;
|
|
*end-- = c;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
namespace funcexp
|
|
{
|
|
|
|
CalpontSystemCatalog::ColType Func_reverse::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
|
|
{
|
|
// operation type is not used by this functor
|
|
return fp[0]->data()->resultType();
|
|
}
|
|
|
|
std::string Func_reverse::getStrVal(rowgroup::Row& row,
|
|
FunctionParm& fp,
|
|
bool& isNull,
|
|
execplan::CalpontSystemCatalog::ColType&)
|
|
{
|
|
string str = stringValue(fp[0], row, isNull);
|
|
|
|
// We used to reverse in the string buffer, but that doesn't
|
|
// work for all compilers as some re-use the buffer on simple
|
|
// string assignment and implement a ref-count. Reversing in the
|
|
// string buffer has the affect of reversing all strings from
|
|
// which this one derived.
|
|
int len = str.length();
|
|
char* pbuf = new char[len + 1];
|
|
strncpy(pbuf, str.c_str(), len);
|
|
pbuf[len] = 0;
|
|
char* end = pbuf + len - 1;
|
|
reverse(pbuf, end);
|
|
string rstr = pbuf;
|
|
delete [] pbuf;
|
|
return rstr;
|
|
}
|
|
|
|
|
|
} // namespace funcexp
|
|
// vim:ts=4 sw=4:
|
|
|