Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/1517#issuecomment-175734134
I have changed the hash function to include that bit-magic that is done in
the other hash tables. (Originally, I thought that it is not needed here,
because I haven't realized that it is not only for diffusing clusters, but also
to have the high bits affect the low bits of the hashes.)
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