Hello Igor, Please check the output of "mtr --valgrind main.sp" I'm getting these warnings: line ==6490== Thread 6: ==6490== Conditional jump or move depends on uninitialised value(s) ==6490== at 0x7762A1: JOIN::optimize() (sql_select.cc:1123) ==6490== by 0x77F2A7: mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3721) ==6490== by 0x773994: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:376) ==6490== by 0x73F055: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6431) ==6490== by 0x7354C9: mysql_execute_command(THD*) (sql_parse.cc:3631) ==6490== by 0x742A48: mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) (sql_parse.cc:7886) ==6490== by 0x730684: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) (sql_parse.cc:1814) ==6490== by 0x72EFF7: do_command(THD*) (sql_parse.cc:1372) ==6490== by 0x883380: do_handle_one_connection(CONNECT*) (sql_connect.cc:1354) ==6490== by 0x883100: handle_one_connection (sql_connect.cc:1260) ==6490== by 0x10D6329: pfs_spawn_thread (pfs.cc:1862) ==6490== by 0x4E3C619: start_thread (in /usr/lib64/libpthread-2.22.so) ==6490== by 0x6DB75FC: clone (in /usr/lib64/libc-2.22.so) ^ Found warnings in /home/bar/maria-git/server.10.2-ext/mysql-test/var/6/log/mysqld.1.err Thanks!