Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/4574
I also agree that these messages have been personally useful. I think this
PR is an improvement but that we could do better to note and/or emphasize the
performance implications of `GenericType`. I'm not sure that we even need to
mention `GenericType` explicitly. I can see how the current message could
confuse users but explaining this as having performance implications should
clarify the reasoning for this being logged.
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