Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3648
Good fix, thanks @haohui
I was wondering - I am a trying to advocate fewer dependencies in Flink
(there is always the problem of shading and conflicts) so if there is a way to
do this without Guava, that'd be great. I think `commons-lang3` has a joiner as
well, or we might just add a joiner to Flink...
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