Don’t allow aliased columns to be queried – it was actually safe but
confusing. We call `created_at` -> `triggered_at` but we still allowed
created_at which was confusing.
Now we have nice errors if you try select columns that aren’t
selectable.
Also removed a ClickHouse setting `allow_experimental_object_type` which
worked fine locally but stopped all queries working on ClickHouse Cloud
🤦♂️
Matt Aitken
1bca378000