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https://issues.apache.org/jira/browse/DRILL-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678547#comment-13678547
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Ted Dunning commented on DRILL-67:
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For averages and especially standard deviations, Welford's method should
generally be used:
http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Online_algorithm
For means alone, it is somewhat slower. For variance, it is dramatically more
accurate.
> Add Min, Max, avg and others Aggregated function
> ------------------------------------------------
>
> Key: DRILL-67
> URL: https://issues.apache.org/jira/browse/DRILL-67
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Alexandre Beche
> Priority: Trivial
> Labels: patch
> Attachments: DRILL-67.patch.txt, DRILL-70-1.patch.txt,
> DRILL-70-feedback.diff, DRILL-70.patch.txt
>
>
> This proposed improvement is to add the MIN(), MAX() and AVG() function to
> the list of the aggregated function.
> SumAggregator will be used as an example.
> Others function could be added
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