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From mengxr <>
Subject [GitHub] spark pull request: SPARK-11420 Updating Stddev support via Impera...
Date Fri, 06 Nov 2015 19:29:50 GMT
Github user mengxr commented on the pull request:
    @rxin We still need to run some benchmark. The formulation is simple and fixed, and hence
codegen won't bring much performance gain.
    @JihongMA Could you address the comments on `NaN` vs `null`?

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