Hello,

I noticed a regression introduced with this change.

If we search on a domain such as the UNION is triggered, with a sort on a Reference field of the main table, the query fails. This is because __searched_column ignores Reference fields (because they are lazy-loaded by default).

This was not a problem before because even though the column was not in the searched columns, it always existed on the table, so a sort on the column did not cause any issue.

This is not specific to Reference fields, but may happen as soon as a search on a domain that triggers the UNION sorts on a lazy-loaded field.