Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11010#issuecomment-180115890
@nongli As the benchmark show, the weak hash function could save 10ns per
row, others may save 20ns per row. I'm also not sure the weak hash function is
enough in this cases. BTW, the hashCode of ing/long in Java are also using this
weak hash function, so they may not that bad.
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