| Server IP : 88.99.149.37 / Your IP : 216.73.216.141 Web Server : nginx/1.31.2 System : Linux server-88-99-149-37 6.12.0-124.56.5.el10_1.x86_64 #1 SMP PREEMPT_DYNAMIC Fri May 15 06:12:08 EDT 2026 x86_64 User : muralimurth ( 1015) PHP Version : 8.4.23 Disable Function : exec,system,passthru,shell_exec,proc_close,proc_open,dl,popen,show_source,posix_kill,posix_mkfifo,posix_getpwuid,posix_setpgid,posix_setsid,posix_setuid,posix_setgid,posix_seteuid,posix_setegid,posix_uname MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : ON Directory : /usr/local/mysql/mysql-test/main/ |
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drop table if exists t1; create table t1 (nr int(5) not null auto_increment,b blob,str char(10), primary key (nr)); select count(*) from t1; count(*) 0 select * from t1; nr b str select * from t1 limit 0; nr b str show status like "Empty_queries"; Variable_name Value Empty_queries 2 drop table t1; select * from t2; ERROR 42S02: Table 'test.t2' doesn't exist show status like "Empty_queries"; Variable_name Value Empty_queries 2 # End of 4.1 tests # # MDEV-30333 Wrong result with not_null_range_scan and LEFT JOIN with empty table # set @save_optimizer_switch=@@optimizer_switch; CREATE TABLE t1 (a INT, b INT) ENGINE=MyISAM; INSERT INTO t1 (b) VALUES (1),(2); CREATE TABLE t2 (c INT) ENGINE=MyISAM; SET optimizer_switch= 'not_null_range_scan=off'; explain extended SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 system NULL NULL NULL NULL 0 0.00 Const row not found 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using filesort Warnings: Note 1003 select `test`.`t1`.`b` AS `b` from `test`.`t1` where `test`.`t1`.`a` is null order by `test`.`t1`.`b` SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b; b 1 2 SET optimizer_switch = 'not_null_range_scan=on'; explain extended SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 system NULL NULL NULL NULL 0 0.00 Const row not found 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using filesort Warnings: Note 1003 select `test`.`t1`.`b` AS `b` from `test`.`t1` where `test`.`t1`.`a` is null order by `test`.`t1`.`b` SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b; b 1 2 flush tables; SELECT b FROM t1 LEFT JOIN t2 ON t2.c = a WHERE a IS NULL ORDER BY b; b 1 2 drop table t1,t2; # Second test in MDEV-30333 CREATE TABLE t1 (a int, b varchar(10)) ENGINE=MyISAM; INSERT INTO t1 VALUES (69,'foo'),(71,'bar'); CREATE TABLE t2 (c int) ENGINE=MyISAM; INSERT INTO t2 VALUES (1),(2); CREATE TABLE t3 (d int, e int, KEY(e)) ENGINE=MyISAM; SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t3.e = t3.d ON 1; a b c d e 69 foo 1 NULL NULL 71 bar 1 NULL NULL 69 foo 2 NULL NULL 71 bar 2 NULL NULL SET optimizer_switch = 'not_null_range_scan=on'; SELECT * FROM t1 LEFT JOIN t2 LEFT JOIN t3 ON t3.e = t3.d ON 1; a b c d e 69 foo 1 NULL NULL 71 bar 1 NULL NULL 69 foo 2 NULL NULL 71 bar 2 NULL NULL DROP TABLE t1, t2, t3; set @@optimizer_switch=@save_optimizer_switch; End of 10.5 tests