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https://issues.apache.org/jira/browse/PIG-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546019
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Patrick Hunt commented on PIG-20:
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Grt. In that case why don't we (I will make the changes if approved):
2a) document instantiateFunc behavior
2b) fixup the subclasses of evalspec per Utkarsh's suggestion
2c) have "getComparator" throw an exception if this.comparator == null
What do you want to throw, runtime exception with appropriate message?
> Sorting using custom comparison functions
> ------------------------------------------
>
> Key: PIG-20
> URL: https://issues.apache.org/jira/browse/PIG-20
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Reporter: Olga Natkovich
> Attachments: usercompare.patch
>
>
> Currently, onlu string based sorting is supported. Once we have types,
> numeric sort will be supported as well. However, soem users express need for
> custome comparison functions for sort.
> Alan put together a design document for this:
> http://wiki.apache.org/pig/UserDefinedOrdering
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