1. There is not much coverage for for multi-table UPDATE (currently only 1 case in rpl.test).
2. Execution under SP must cover tempesta-tech/mariadb#39 (late edition is known to miss it).
3. Coverage for triggers.
4. Use check_row() for update, delete tests.
5. `versioning.insert2` is failing under --sp-protocol.
6. Possible merge extraneous test files (insert and insert2, select and select2, update and update2).

To be continued... Please, suggest more coverage cases.