Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/861#issuecomment-133077364
I fear that the PR cannot be merged in this state. It contains some serious
performance issues which first have to be addressed. Mainly they originate from
performing linear time complexity operations for each element. This will result
in a quadratic runtime complexity. Once the problems have been addressed, I'll
review the PR again.
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