Abacn commented on code in PR #17708:
URL: https://github.com/apache/beam/pull/17708#discussion_r886254969


##########
sdks/python/apache_beam/io/fileio.py:
##########
@@ -525,8 +526,11 @@ def __init__(
   @staticmethod
   def _get_sink_fn(input_sink):
     # type: (...) -> Callable[[Any], FileSink]
-    if isinstance(input_sink, FileSink):
-      return lambda x: input_sink
+    if isinstance(input_sink, type) and issubclass(input_sink, FileSink):

Review Comment:
   Sorry, previously sink=fileio.TextSink would not work either. It would try 
to call `fileio.TextSink(destination)` 
[here](https://github.com/apache/beam/blob/d0c0dee32cf42fdaeb4e9b1556419906eb104029/sdks/python/apache_beam/io/fileio.py#L805)
 and get a TypeError of mismatch constructor parameter



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