[jira] [Commented] (PIG-2137) SAMPLE should not be pushed above DISTINCT

["Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-2137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053023#comment-13053023 ] 

Dmitriy V. Ryaboy commented on PIG-2137:
----------------------------------------

Turning off PushUpFilter fixes the issue. It seems like the fix to PIG-2014 was incomplete.

> SAMPLE should not be pushed above DISTINCT
> ------------------------------------------
>
>                 Key: PIG-2137
>                 URL: https://issues.apache.org/jira/browse/PIG-2137
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.0, 0.8.1, 0.9.0, 0.10
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Dmitriy V. Ryaboy
>            Priority: Critical
>
> I have an input file that contains 50,000 distinct integers. Each integer is repeated twice, for a total of 100,000 lines.
> Script 1, using GROUP BY to get distinct entries in the data, works:
> {code}
> grunt> f = load 'tmp/dupnumbers.txt';              
> grunt> d = foreach (group f by $0) generate group; 
> grunt> s = sample d 0.01;                          
> grunt> n = foreach (group s all) generate COUNT(s);
> grunt> dump n;
> (493)
> {code}
> Script 2, using DISTINCT for the same purpose, allows sampling to be done before DISTINCT:
> {code}
> grunt> f = load 'tmp/dupnumbers.txt';              
> grunt> d = distinct f;
> grunt> s = sample d 0.01;                          
> grunt> n = foreach (group s all) generate COUNT(s);
> (980)
> {code}

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