Fix Column Already Exists Error with FINAL and SAMPLE in ClickHouse

Why it matters

This fix addresses the conflict that caused duplicate column errors when combining the FINAL modifier with SAMPLE clauses in queries. It ensures that users can safely perform sampling on finalized data parts without encountering errors, improving query reliability and usability.

How to use it

Simply use the FINAL modifier together with the SAMPLE clause in your query as usual. For example:

SELECT count() FROM table FINAL SAMPLE 1/2

This fix removes the previous limitation where such queries would fail due to column duplication errors.