[jira] [Comment Edited] (PIG-4377) Skewed outer join produce wrong result if a key is oversampled

["Daniel Dai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-4377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561346#comment-14561346 ] 

Daniel Dai edited comment on PIG-4377 at 5/27/15 5:40 PM:
----------------------------------------------------------

Actually PIG-4377-3.patch is needed, since IsFirstReduceOfKey of the join vertex need sample input. Attach PIG-4377-4.patch to bring it back, add comments and fix TestTezCompiler failures.


was (Author: daijy):
Actually PIG-4377-3.patch is needed, since the join vertex. Attach PIG-4377-4.patch to bring it back, add comments and fix TestTezCompiler failures.

> Skewed outer join produce wrong result if a key is oversampled
> --------------------------------------------------------------
>
>                 Key: PIG-4377
>                 URL: https://issues.apache.org/jira/browse/PIG-4377
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.15.0
>
>         Attachments: PIG-4377-1.patch, PIG-4377-2.patch, PIG-4377-3.patch, PIG-4377-4.patch, reproduce.patch
>
>
> Skewed outer join produce more than expected rows under certain condition. The extra rows contain null left relation. Can be reproduced reliably with reproduce.patch (run SkewedJoin_11).



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