aaltay commented on code in PR #17708:
URL: https://github.com/apache/beam/pull/17708#discussion_r886240367


##########
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:
   For my learning, so this will work with:
   sink=fileio.TextSink()
   and
   sink=fileio.TextSink
   
   and previously it was only working with:
   sink=fileio.TextSink
   
   Is that correct?



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