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/* 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; bool with_ties; public: Select_limit_counters(): select_limit_cnt(0), offset_limit_cnt(0), with_ties(false) {}; Select_limit_counters(const Select_limit_counters &orig): select_limit_cnt(orig.select_limit_cnt), offset_limit_cnt(orig.offset_limit_cnt), with_ties(orig.with_ties) {}; void set_limit(ha_rows limit, ha_rows offset, bool with_ties_arg) { if (limit == 0) offset= 0; offset_limit_cnt= offset; select_limit_cnt= limit; with_ties= with_ties_arg; /* Guard against an overflow condition, where limit + offset exceede ha_rows value range. This case covers unreasonably large parameter values that do not have any practical use so assuming in this case that the query does not have a limit is fine. */ 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; with_ties= false; } /* 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() const { return select_limit_cnt == HA_POS_ERROR; } /* Set the limit to allow returning an unlimited number of rows. Useful for cases when we want to continue execution indefinitely after the limit is reached (for example for SQL_CALC_ROWS extension). */ void set_unlimited() { select_limit_cnt= HA_POS_ERROR; } /* Reset the limit entirely. */ void clear() { select_limit_cnt= HA_POS_ERROR; offset_limit_cnt= 0; with_ties= false;} bool check_offset(ha_rows sent) const { return sent < offset_limit_cnt; } void remove_offset() { offset_limit_cnt= 0; } ha_rows get_select_limit() const { return select_limit_cnt; } ha_rows get_offset_limit() const { return offset_limit_cnt; } bool is_with_ties() const { return with_ties; } }; #endif // INCLUDES_MARIADB_SQL_LIMIT_H
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