mikebridge commented on code in PR #45126:
URL: https://github.com/apache/superset/pull/45126#discussion_r4235598556


##########
superset/semantic_layers/mapper.py:
##########
@@ -192,7 +194,9 @@ def get_results(query_object: QueryObject) -> QueryResult:
         # Add this query's requests to the collection
         all_requests.extend(result.requests)
 
-        offset_df = stringify_extension_columns(result.results).to_pandas()
+        offset_df = stringify_extension_columns(result.results).to_pandas(
+            integer_object_nulls=True,
+        )

Review Comment:
   Good catch — the left join was upcasting an exact int64 offset metric when 
the prior period had no row for a main-period category. I applied your cast 
before the merge.
   
   - Added a chart-data regression with main categories A/B and an offset row 
for A only; before the fix, `9007199254740993` returned as 
`9007199254740992.0`, and it now returns as the exact string.
   - All 18 precision cases and the changed-file hooks pass.



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