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Diffstat (limited to 'mysql-test/main/empty_table.result')
| -rw-r--r-- | mysql-test/main/empty_table.result | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/mysql-test/main/empty_table.result b/mysql-test/main/empty_table.result new file mode 100644 index 00000000..90aec2ed --- /dev/null +++ b/mysql-test/main/empty_table.result @@ -0,0 +1,76 @@ +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 |