This is an umbrella ticket for cleaning up the columnstore segment of community BB. At present there are known issues with that, which however did not prevent the end result from being approved. But the final objective is to make it clean, and then introduce a proper regression, server style.

As of this moment elenst is in the process of putting an intermediate step (automatic testing of installation and configuration, including upgrade). What remains is:

1. Correcting all tickets included here now and in a future
2. Gradual introduction of MTR-compliant regression tests (a separate project in progress)
3. Activation of automated regression tests as they become available.