GitHub user zhengruifeng opened a pull request:

    https://github.com/apache/spark/pull/18902

    [SPARK-21690][ML] one-pass imputer

    ## What changes were proposed in this pull request?
    parallelize the computation of all columns
    
    ## How was this patch tested?
    existing tests


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/zhengruifeng/spark parallelize_imputer

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/18902.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18902
    
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commit c4042ad23bcf94b758ee8c345c15fc85037cbdb9
Author: Zheng RuiFeng <ruife...@foxmail.com>
Date:   2017-06-07T04:26:41Z

    create pr

commit 4c35bda0e073084a608df8e8bc28c4dae5a1fc5b
Author: Zheng RuiFeng <ruife...@foxmail.com>
Date:   2017-06-07T04:30:26Z

    handle missing

commit 9a6ac59d5191a57a9b0b671414a2dbac1a3c3b3d
Author: Zheng RuiFeng <ruife...@foxmail.com>
Date:   2017-06-07T05:33:30Z

    use summary

commit f6f166fef4e17db7e36ccecf41aebe3443e9fef5
Author: Zheng RuiFeng <ruife...@foxmail.com>
Date:   2017-06-07T06:22:58Z

    x

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