Github user Renkai commented on the issue:
https://github.com/apache/flink/pull/2729
Hi, @aljoscha I think the case make sense not only when parallelsim is
1,but also users knows the code would be execute in parallel and the code is
thread safe and they may want to reduce some resource like memory or network
connection.However, even we totaly forbidden a scala object to extend a UDF
function, they can still refer to a scala object in UDF which may cause
concurrent exceptions.
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