GitHub user iyerr3 opened a pull request:

    Balance Sample: Add support for grouping

    JIRA: MADLIB-1168
    This commit adds grouping support for balanced sampling. 
    Grouping is implemented as a loop over the existing logic, 
    with the sampling for each group run independently. 
    Closes #239

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    This closes #239
commit 6c5fcfb375eaf7dc68e1ede4aca2a47b8e55309b
Author: Rahul Iyer <riyer@...>
Date:   2018-02-24T02:45:32Z

    Clean code + conform to PEP8

commit a5a0c1e2c851a923b9eb550d42dfc594b4635c64
Author: Rahul Iyer <riyer@...>
Date:   2018-02-26T23:01:34Z

    Add a Collate plpy results function

commit 8e8eca2960207ca0317ded68608c660b8d4ddb55
Author: Rahul Iyer <riyer@...>
Date:   2018-03-02T00:44:54Z

    Add grouping in get_level_frequency_distribution

commit cad4a5be732f89504ff62f4d9e68367d174fc322
Author: Rahul Iyer <riyer@...>
Date:   2018-03-07T07:07:00Z

    Ensure subqueries are filtering groups and using right count

commit 39dd6f436bb9b8d505be5204226dcc3053b1b4df
Author: Rahul Iyer <riyer@...>
Date:   2018-03-07T07:07:14Z

    Update install check to include grouping

commit d61ff28290dad27ead0f1c68d740a8ccb79f4aec
Author: Rahul Iyer <riyer@...>
Date:   2018-03-07T07:07:27Z

    Update documentation with grouping examples



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