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From "Daniel Dai (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2423) document use case where co-group is better choice than join
Date Mon, 16 Jan 2012 05:57:41 GMT

    [ https://issues.apache.org/jira/browse/PIG-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186713#comment-13186713

Daniel Dai commented on PIG-2423:

Hi, Jie
The document source is src/docs/src/documentation/content/xdocs/perf.xml. But the best way
is to describe the diff in the Jira, we will ask Corinne to change the document source. 
> document use case where co-group is better choice than join 
> ------------------------------------------------------------
>                 Key: PIG-2423
>                 URL: https://issues.apache.org/jira/browse/PIG-2423
>             Project: Pig
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Thejas M Nair
>             Fix For: 0.10
> Optimization rules 2 and 3 suggested in https://issues.apache.org/jira/secure/attachment/12506841/pig_tpch.ppt
(PIG-2397) recommend the use of co-group instead of  join in certain cases. These should be
documented in pig performance page.

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