Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2664
@StephanEwen @rmetzger, why would a user copy an optional fat jar rather
than having it included in their uber jar?
By creating fat jars, do we not have the potential for duplicate
dependencies if more than one fat jar is included on the classpath? I don't
think we can shade since the user may be depending on the transitive
dependencies.
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