Dropna after

Author: mroeschke

pandas/core/arrays/arrow/array.py

@@ -1359,10 +1359,11 @@ def _mode(self: ArrowExtensionArrayT, dropna: bool = True) -> ArrowExtensionArra
         else:
             data = self._data
 
+        res = pc.value_counts(data)
+
         if dropna:
-            data = data.drop_null()
+            res = data.drop_null()
 
-        res = pc.value_counts(data)
         most_common = res.field("values").filter(
             pc.equal(res.field("counts"), pc.max(res.field("counts")))
         )