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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-20) Sorting using custom comparison functions
Date Tue, 27 Nov 2007 19:00:49 GMT

    [ https://issues.apache.org/jira/browse/PIG-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545968
] 

Patrick Hunt commented on PIG-20:
---------------------------------

1) I can randomize the data however notice that I'm typically using in reverse order, such
that the sort is not just "passing through". I'll add this.

2) What is the contract for instantiateFunc (and getComparator) method, I can't find it documented
anywhere. This would help a lot in understanding how to address this issue. Perhaps someone
can update the javadoc to make it explicit (would be beneficial going fwd, even after this
change). I would be willing to do this but I don't understand the background/expectations
of this function. Original author avail?

3a) I have eclipse set to use spaces instead of tabs, must have snuck in during copy/paste.
I'll take a look.

3b) er, looks like another eclipse issue (my config), I'll fix the source.

> 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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