HyukjinKwon commented on code in PR #46002:
URL: https://github.com/apache/spark/pull/46002#discussion_r1562004935


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python/pyspark/sql/connect/session.py:
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@@ -1034,6 +1034,20 @@ def profile(self) -> Profile:
 
     profile.__doc__ = PySparkSession.profile.__doc__
 
+    def __custom_reduce_handler__(self) -> Tuple:

Review Comment:
   Can we simply call `SparkSession.getActiveSession`, and throw an exception 
if it returns `None`? We can also add an explicit session ID validation by 
`self._session_id == new._session_id` comparison, and would not have to bother 
with the custom dispatcher stuff.



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