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https://issues.apache.org/jira/browse/PIG-1169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834633#action_12834633
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Hadoop QA commented on PIG-1169:
--------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12436055/PIG-1169.patch
against trunk revision 909921.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/206/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/206/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/206/console
This message is automatically generated.
> 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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