jesperct commented on PR #41060:
URL: https://github.com/apache/superset/pull/41060#issuecomment-4719136817

   Thanks for the careful pass. All three are in f0956f7:
   
   - Redundant lookups: `_collect_dttm_labels` now does a single `get_column` 
per label and returns `(label, fmt)` pairs, so `normalize_df` reads the format 
straight from those instead of resolving it again. Raw labels drop from three 
lookups to one.
   - The `not in base_labels` list scan is now a `seen` set, which also dedups 
a column that appears as both a base-axis label and the granularity.
   - Added a test for the granularity/columns overlap case.
   
   Left `_python_date_format` in place since the legacy `__timestamp` branch 
still uses it for the granularity column.


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