File: impossible_on_condition.sql

package info (click to toggle)
percona-toolkit 3.7.1-1
  • links: PTS, VCS
  • area: main
  • in suites:
  • size: 106,720 kB
  • sloc: perl: 257,236; sql: 23,577; sh: 21,388; javascript: 6,322; makefile: 398; python: 62; awk: 38; sed: 1
file content (7 lines) | stat: -rw-r--r-- 751 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
 
explain select * from t2 LEFT JOIN t on t2.id = t.id AND 1 = 0 WHERE t2.id = 1;
+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+
| id   | select_type | table | type  | possible_keys | key  | key_len | ref  | rows | Extra                   |
+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+
|    1 | SIMPLE      | t     | const | t_id          | NULL | NULL    | NULL | 0    | Impossible ON condition |
|    1 | SIMPLE      | t2    | ALL   | NULL          | NULL | NULL    | NULL | 1    | Using where             |
+------+-------------+-------+-------+---------------+------+---------+------+------+-------------------------+