ueshin commented on a change in pull request #33485:
URL: https://github.com/apache/spark/pull/33485#discussion_r675261177
##########
File path: python/pyspark/pandas/categorical.py
##########
@@ -439,8 +439,47 @@ def remove_categories(
else:
return psser
- def remove_unused_categories(self) -> "ps.Series":
- raise NotImplementedError()
+ def remove_unused_categories(self, inplace: bool = False) ->
Optional["ps.Series"]:
+ """
+ Remove categories which are not used.
+
+ Parameters
+ ----------
+ inplace : bool, default False
+ Whether or not to drop unused categories inplace or return a copy of
+ this categorical with unused categories dropped.
Review comment:
Cool. Let me address it in a clean-up PR later. SPARK-36267
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