Github user danielblazevski commented on the pull request:
https://github.com/apache/flink/pull/1220#issuecomment-171277446
Hi @chiwanpark , I agree `cross` is an expensive computation. That part of
the code was adopted from your earlier version. Before I try to change it, do
you have ideas on the best strategy to fix it using the most efficient
Flink-esque features?
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