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Path : /usr/include/mysql/server/private/
Current File : //usr/include/mysql/server/private/sql_limit.h
/*  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 St, Fifth Floor, Boston, MA 02110-1335  USA */


#ifndef INCLUDES_MARIADB_SQL_LIMIT_H
#define INCLUDES_MARIADB_SQL_LIMIT_H
/**
  LIMIT/OFFSET parameters for execution.
*/

class Select_limit_counters
{
  ha_rows select_limit_cnt, offset_limit_cnt;

  public:
    Select_limit_counters():
       select_limit_cnt(0), offset_limit_cnt(0)
       {};
    Select_limit_counters(Select_limit_counters &orig):
       select_limit_cnt(orig.select_limit_cnt),
       offset_limit_cnt(orig.offset_limit_cnt)
       {};

   void set_limit(ha_rows limit, ha_rows offset)
   {
      if (limit == 0)
        offset= 0;
      offset_limit_cnt= offset;
      select_limit_cnt= limit;
      if (select_limit_cnt + offset_limit_cnt >=
          select_limit_cnt)
        select_limit_cnt+= offset_limit_cnt;
      else
        select_limit_cnt= HA_POS_ERROR;
   }

   void set_single_row()
   {
     offset_limit_cnt= 0;
     select_limit_cnt= 1;
   }

   /* Send the first row, still honoring offset_limit_cnt */
   void send_first_row()
   {
     /* Guard against overflow */
     if ((select_limit_cnt= offset_limit_cnt +1 ) == 0)
       select_limit_cnt= offset_limit_cnt;
     // with_ties= false;   Remove // on merge to 10.6
   }

   bool is_unlimited()
   { return select_limit_cnt == HA_POS_ERROR; }
   bool is_unrestricted()
   { return select_limit_cnt == HA_POS_ERROR && offset_limit_cnt == 0; }
   void set_unlimited()
   { select_limit_cnt= HA_POS_ERROR; offset_limit_cnt= 0; }

   bool check_offset(ha_rows sent)
   {
     return sent < offset_limit_cnt;
   }
   void remove_offset() { offset_limit_cnt= 0; }

   ha_rows get_select_limit()
   { return select_limit_cnt; }
   ha_rows get_offset_limit()
   { return offset_limit_cnt; }
};

#endif // INCLUDES_MARIADB_SQL_LIMIT_H
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