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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1525) Incorrect data generated by diff of SUM
Date Fri, 30 Jul 2010 18:58:17 GMT

    [ https://issues.apache.org/jira/browse/PIG-1525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894110#action_12894110
] 

Richard Ding commented on PIG-1525:
-----------------------------------

This problem affects other BinaryExpressionOperators as well.

> Incorrect data generated by diff of SUM
> ---------------------------------------
>
>                 Key: PIG-1525
>                 URL: https://issues.apache.org/jira/browse/PIG-1525
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.8.0
>
>
> Given data;
> input1:
> {code}
> id9     0
> {code}
> input2:
> {code}
> id8     1
> id9     1
> {code}
> Pig script
> {code}
> A = LOAD 'input1' AS (id:chararray, val:long);
> B = LOAD 'input2' AS (id:chararray, val:long);
> C = COGROUP A BY id, B BY id;
> D = FOREACH C GENERATE group, SUM(B.val), SUM(A.val), (SUM(A.val) - SUM(B.val));
> dump D;
> {code}
> generates incorrect data:
> {code}
> (id8,1L,,)
> (id9,1L,0L,-2L)
> {code}
> The workaround is to replace the FOREACH statement with
> {code}
> D = FOREACH C GENERATE group, SUM(B.val) as b, SUM(A.val) as a;
> E = FOREACH D GENERATE $0, b, a, (a-b);
> {code}

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