Normal select queries with group by generate writesets

[Miguel Angel Nieto]

A SELECT query that runs inside a transaction seems to generate a writeset. So, it gets limited by wsrep_max_ws_rows variable. Use the latest 5.6 pxc where the variable has been enabled again:

mysql> set global wsrep_max_ws_rows=2;
mysql> start transaction;
mysql> select * from t group by i;
+------+
| i |
+------+
| 1 |
+------+

mysql> select * from t group by i;
+------+
| i |
+------+
| 1 |
+------+

mysql> select * from t group by i;
ERROR 1180 (HY000): wsrep_max_ws_rows exceeded

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXC-720