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Date: Wed, 28 Oct 2009 02:11:59 +0000 (UTC)
From: "Pradeep Kamath (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
Subject: [jira] Updated: (PIG-953) Enable merge join in pig to work with
 loaders and store functions which can internally index sorted data
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     [ https://issues.apache.org/jira/browse/PIG-953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pradeep Kamath updated PIG-953:
-------------------------------

    Attachment: PIG-953-8.patch

> Enable merge join in pig to work with loaders and store functions which can internally index sorted data 
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-953
>                 URL: https://issues.apache.org/jira/browse/PIG-953
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>         Attachments: PIG-953-2.patch, PIG-953-3.patch, PIG-953-4.patch, PIG-953-5.patch, PIG-953-6.patch, PIG-953-7.patch, PIG-953-8.patch, PIG-953.patch
>
>
> Currently merge join implementation in pig includes construction of an index on sorted data and use of that index to seek into the "right input" to efficiently perform the join operation. Some loaders (notably the zebra loader) internally implement an index on sorted data and can perform this seek efficiently using their index. So the use of the index needs to be abstracted in such a way that when the loader supports indexing, pig uses it (indirectly through the loader) and does not construct an index. 

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