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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1169) Top-N queries produce incorrect results when a store statement is added between order by and limit statement
Date Tue, 16 Feb 2010 23:47:28 GMT

     [ https://issues.apache.org/jira/browse/PIG-1169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard Ding updated PIG-1169:
------------------------------

    Attachment: PIG-1169.patch

> Top-N queries produce incorrect results when a store statement is added between order
by and limit statement
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1169
>                 URL: https://issues.apache.org/jira/browse/PIG-1169
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.7.0
>
>         Attachments: PIG-1169.patch
>
>
> ??We tried to get top N results after a groupby and sort, and got different results with
or without storing the full sorted results. Here is a skeleton of our pig script.??
> {code}
> raw_data = Load '<input_files>' AS (f1, f2, ..., fn);
> grouped = group raw_data by (f1, f2);
> data = foreach grouped generate FLATTEN(group). SUM(raw_data.fk) as value;
> ordered = order data by value DESC parallel 10;
> topn = limit ordered 10;
> store ordered into 'outputdir/full';
> store topn into 'outputdir/topn';
> {code}
> ??With the statement 'store ordered ...', top N results are incorrect, but without the
statement, results are correct. Has anyone seen this before? I know a similar bug has been
fixed in the multi-query release. We are on pig .4 and hadoop .20.1.??

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