Incompatibilites:
- Due to changes in pg_stat_statements in 11, queryid is now on 64 bits.
SQL functions no longer use oid type but bigint for queryid attribute
(even for PG prior to 11).
Miscellaneous:
- Add pg 11 compatibility (Adrien Nayrat helped by Julien Rouhaud and Thomas Reiss)
- Warn if incorrect configuration setting is used (Julien Rouhaud)