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https://issues.apache.org/jira/browse/PIG-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14697718#comment-14697718
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Rohini Palaniswamy commented on PIG-4657:
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Tested it for group by. A job which was taking 2 hrs came down to 30 mins.
> [Pig on Tez] Optimize GroupBy and Distinct key comparison
> ---------------------------------------------------------
>
> Key: PIG-4657
> URL: https://issues.apache.org/jira/browse/PIG-4657
> Project: Pig
> Issue Type: Sub-task
> Reporter: Rohini Palaniswamy
> Assignee: Rohini Palaniswamy
> Fix For: 0.16.0
>
> Attachments: PIG-4657-1.patch
>
>
> While bytes comparator cannot be used for joins till TEZ-2715 is
> available, they can be used for group by and distinct if they have only one
> Tez input. If there is more than one input due to union optimization
> (OrderedGroupedMergedKVInput) , full comparator has to be still used as
> OrderedGroupedMergedKVInput uses the comparator to merge the two underlying
> inputs.
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