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Date: Fri, 19 Nov 2010 15:29:16 -0500 (EST)
From: "Daniel Dai (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
Subject: [jira] Updated: (PIG-1737) New logical plan: Improve error messages
 when merge schema fail
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     [ https://issues.apache.org/jira/browse/PIG-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai updated PIG-1737:
----------------------------

    Attachment: PIG-1737-2.patch

Changed the patch as per Thejas's suggestion.

> New logical plan: Improve error messages when merge schema fail
> ---------------------------------------------------------------
>
>                 Key: PIG-1737
>                 URL: https://issues.apache.org/jira/browse/PIG-1737
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.8.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.8.0
>
>         Attachments: PIG-1737-1.patch, PIG-1737-2.patch
>
>
> Pig fail when foreach schema does not match user defined schema with the NPE. The error message should be enhanced. Eg:
> {code}
> a = load '1.txt' as (a0, a1, a2);
> b = group a by (a0, a1);
> c = foreach b generate flatten(group) as c0;
> dump c;
> {code}
> flatten(group) contains 2 items, user cannot name it into c0 alone. However, Pig die with NPE, which is clueless to the user.

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