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https://issues.apache.org/jira/browse/PIG-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546045
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Alan Gates commented on PIG-20:
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After looking at it some I'm convinced that for the time being what Patrick has
submitted will work. (All the unit and nightly tests pass, so there's some
backing for my conviction.) In all the places where getComparator is called
and the user provided ordering function needs to be used, instantiateFunc will
have already been called.
In the long run I think the right solution is to make PigContext a singleton so
that instantiateFunc can be called at any time as needed. In the short term I
think we should take the patch as previously submitted and file a bug to fix
the PigContext singleton issue. Unless I hear howls of dissent that's what
I'll do.
> 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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