GitHub user mgaido91 opened a pull request:

    [SPARK-23907][SQL] Add regr_* functions

    ## What changes were proposed in this pull request?
    The PR introduces regr_slope, regr_intercept, regr_r2, regr_sxx, regr_syy, 
regr_sxy, regr_avgx, regr_avgy, regr_count.
    The implementation of this functions mirrors Hive's one in HIVE-15978.
    ## How was this patch tested?
    added UT (values compared with Hive)

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

    $ git pull SPARK-23907

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

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

    This closes #21054
commit 90c266e09e276c37126d8428a4d00f4986d240e5
Author: Marco Gaido <marcogaido91@...>
Date:   2018-04-12T12:27:39Z

    [SPARK-23907][SQL] Add regr_* functions



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