Olga Natkovich updated PIG-1150:

    Fix Version/s:     (was: 0.5.0)

Updating the fix version since it will go into the future version and will not 
be backported

> VAR() Variance UDF
> ------------------
>                 Key: PIG-1150
>                 URL: https://issues.apache.org/jira/browse/PIG-1150
>             Project: Pig
>          Issue Type: New Feature
>    Affects Versions: 0.5.0
>         Environment: UDF, written in Pig 0.5 contrib/
>            Reporter: Russell Jurney
>             Fix For: 0.7.0
> I've implemented a UDF in Pig 0.5 that implements Algebraic and calculates 
> variance in a distributed manner, based on the AVG() builtin.  It works by 
> calculating the count, sum and sum of squares, as described here: 
> http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Parallel_algorithm
> Is this a worthwhile contribution?  Taking the square root of this value 
> using the contrib SQRT() function gives Standard Deviation, which is missing 
> from Pig.

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