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https://issues.apache.org/jira/browse/PIG-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877619#action_12877619
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Aniket Mokashi commented on PIG-1405:
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Currently, we have COR(elation) and COV(ariance) functions in piggybank as part
of stats package. But, there is no existing implementation of VAR(iance).
> Need to move many standard functions from piggybank into Pig
> ------------------------------------------------------------
>
> Key: PIG-1405
> URL: https://issues.apache.org/jira/browse/PIG-1405
> Project: Pig
> Issue Type: Improvement
> Reporter: Alan Gates
> Assignee: Aniket Mokashi
> Fix For: 0.8.0
>
>
> There are currently a number of functions in Piggybank that represent
> features commonly supported by languages and database engines. We need to
> decide which of these Pig should support as built in functions and put them
> in org.apache.pig.builtin. This will also mean adding unit tests and
> javadocs for some UDFs. The existing classes will be left in Piggybank for
> some time for backward compatibility.
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