Comment 4 for bug 625045

PS 5.1 is also affected:

[openxs@chief p5.1]$ bin/mysql --no-defaults -uroot test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.68 Source distribution

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affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create table t1 (id int primary key) engine=InnoDB;
Query OK, 0 rows affected (0.07 sec)

mysql> create table p1 (id int primary key) engine=InnoDB partition by hash(id) partitions 8;
Query OK, 0 rows affected (0.11 sec)

mysql> insert into t1 values (2), (33), (3), (100), (4);
Query OK, 5 rows affected (0.01 sec)
Records: 5 Duplicates: 0 Warnings: 0

mysql> insert into p1 values (2), (33), (3), (100), (4);
Query OK, 5 rows affected (0.01 sec)
Records: 5 Duplicates: 0 Warnings: 0

mysql> set global userstat=1;
ERROR 1193 (HY000): Unknown system variable 'userstat'
mysql> set global userstat_running=1;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1;
+-----+
| id |
+-----+
| 2 |
| 3 |
| 4 |
| 33 |
| 100 |
+-----+
5 rows in set (0.00 sec)

mysql> select * from p1;
+-----+
| id |
+-----+
| 2 |
| 3 |
| 4 |
| 33 |
| 100 |
+-----+
5 rows in set (0.00 sec)

mysql> select * from INFORMATION_SCHEMA.INDEX_STATISTICS;
+--------------+------------+------------+-----------+
| TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ |
+--------------+------------+------------+-----------+
| test | t1 | PRIMARY | 5 |
+--------------+------------+------------+-----------+
1 row in set (0.00 sec)

mysql> select * from INFORMATION_SCHEMA.TABLE_STATISTICS;
+--------------+------------+-----------+--------------+------------------------+
| TABLE_SCHEMA | TABLE_NAME | ROWS_READ | ROWS_CHANGED | ROWS_CHANGED_X_INDEXES |
+--------------+------------+-----------+--------------+------------------------+
| test | t1 | 5 | 0 | 0 |
+--------------+------------+-----------+--------------+------------------------+
1 row in set (0.00 sec)