rusackas commented on issue #25659:
URL: https://github.com/apache/superset/issues/25659#issuecomment-4043438466

   This may overlap with #22704 (SQL parsing/validation errors with complex 
queries), but the most recent comment suggests it may be distinct — the issue 
is specifically with `WITH ... AS` containing `UNION` failing at dataset save 
time, not at query execution time.
   
   Before investing time in a fix, it would help to:
   1. Confirm whether this still occurs on Superset 5.x (note: 3.0.0 is no 
longer supported)
   2. Clarify whether the failure is during SQL parsing/validation (same root 
cause as #22704) or in a different code path
   
   If you can reproduce on 5.x, please comment with the exact error message 
from the server logs.


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