Cloud-Architect-Emma opened a new pull request, #40190:
URL: https://github.com/apache/superset/pull/40190

   Fixes #39951
   
   ## Problem
   ClickHouse (and some other backends) return numeric SUM() columns as
   strings. The existing `infer_objects()` call does not convert these to
   numeric types, causing `pandas/core/nanops.py` to raise:
   `TypeError: Could not convert string '655' to numeric`
   
   ## Fix
   Replace `infer_objects()` with `pd.to_numeric(errors="ignore")` which
   correctly converts string-encoded numerics while leaving truly
   non-numeric columns unchanged.
   
   ## Testing
   The existing `df_metrics_to_num` tests cover this path.


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