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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1193) Secondary sort issue on nested desc sort
Date Sat, 16 Jan 2010 07:54:54 GMT

     [ https://issues.apache.org/jira/browse/PIG-1193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-1193:
----------------------------

    Status: Open  (was: Patch Available)

> Secondary sort issue on nested desc sort
> ----------------------------------------
>
>                 Key: PIG-1193
>                 URL: https://issues.apache.org/jira/browse/PIG-1193
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.6.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>
>         Attachments: PIG-1193-1.patch, PIG-1193-2.patch
>
>
> Secondary sort doing nested desc sort order incorrectly if the following conditions meet:
> 1. We have sort and UDF in nested plan
> 2. This UDF will use the same input tuples more than once
> 3. The input tuples are sorted in desc order
> Here is a test case:
> {code}
> register sequence.jar;
> A = load 'input' as (a0:int);
> B = group A ALL;
> C = foreach B {
>     D = order A by a0 desc;
>     generate sequence.CUMULATIVE(D,D);
> };
> dump C;
> {code}
> input file:
> {code}
> 3
> 4
> {code}
> The input for the UDF is:
> {code}
> ({(4),(3)},{(3),(4)})
> {code}
> The first bag is sorted desc, but the second is not.

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