dianfu commented on code in PR #29146:
URL: https://github.com/apache/flink/pull/29146#discussion_r3990441927


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flink-python/pyflink/dataframe/sql.py:
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@@ -33,49 +34,61 @@
 
 _LOG = logging.getLogger(__name__)
 
+_Binding = Union[DataFrame, _DataFrameUDFWrapper]

Review Comment:
   Make sense to me. 👍 If we find it better to take the other solutions in the 
future, we can address them in a separate ticket to keep this PR more focus.



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