use is_categorical_dtype(arr_value.dtype), as is_categorical_astype is not necessary

keechongtan · keechongtan · commit 4257fe8a5fe6 · 2019-12-02T14:57:32.000Z
diff --git a/pandas/core/internals/blocks.py b/pandas/core/internals/blocks.py
@@ -867,7 +867,7 @@ def setitem(self, indexer, value):
             values[indexer] = value
 
         elif (
-            self.is_categorical_astype(arr_value.dtype)
+            is_categorical_dtype(arr_value.dtype)
             and not is_categorical_dtype(values)
             and exact_match
         ):
