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https://issues.apache.org/jira/browse/PIG-1654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720531#comment-13720531
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Sergey commented on PIG-1654:
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Not a problem.
> Pig should check schema alias duplication at any levels.
> --------------------------------------------------------
>
> Key: PIG-1654
> URL: https://issues.apache.org/jira/browse/PIG-1654
> Project: Pig
> Issue Type: Bug
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Fix For: 0.9.0
>
>
> The following script appears valid to Pig but it shouldn't:
> A = load 'file' as (a:tuple( u:int, u:bytearray, w:long), b:int, c:chararray);
> dump A;
> Pig tries to launch map/reduce jobs for this.
> However, for the following script, Pig correctly reports error message:
> A = load 'file' as (a:int, a:long, c:bytearray);
> dump A;
> Error message is:
> 2010-09-28 15:53:37,390 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1108: Duplicate schema alias: b in "A"
> Thus, Pig only checks alias duplication at the top level, which is confirmed
> by looking at the code. The right behavior is that the same check should be
> applied at all levels.
> This should be addressed in the new parser.
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