Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/3933
Lets see what Till says.
In my opinion, both approaches are fine. What you are proposing makes
things on Flink's side a bit more complicated, but the behavior is consistent
with other places where user code is executed.
Till's proposal (so get the CL via the class) keeps our code
straightforward, but users have to know it.
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