Github user uce commented on the pull request:
https://github.com/apache/flink/pull/236#issuecomment-69053916
I was initially leaning towards activating by default, but this might be
problematic when users just think that the system is slow (and not the special
case of POJO sub types). But if we keep it deactivated by default, we should
catch the error and give a meaningful message with the switch and a performance
warning.
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