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[branch-1.1][SPARK-4355] OnlineSummarizer doesn't merge mean correctly
andrewor14 This backports the bug fix in #3220 . It would be good if we can get it in 1.1.1. But this is minor. Author: Xiangrui Meng <[email protected]> Closes #3251 from mengxr/SPARK-4355-1.1 and squashes the following commits: 33886b6 [Xiangrui Meng] Merge remote-tracking branch 'apache/branch-1.1' into SPARK-4355-1.1 91fe1a3 [Xiangrui Meng] fix OnlineSummarizer.merge when other.mean is zero
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