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https://issues.apache.org/jira/browse/PIG-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204921#comment-15204921
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Kevin J. Price commented on PIG-3000:
-------------------------------------
Did this patch just get dropped? This is still a serious problem.
> Optimize nested foreach
> -----------------------
>
> Key: PIG-3000
> URL: https://issues.apache.org/jira/browse/PIG-3000
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.10.0
> Reporter: Richard Ding
> Assignee: Mona Chitnis
> Attachments: PIG-3000-6.patch, unit_tests.patch
>
>
> In this Pig script:
> {code}
> A = load 'data' as (a:chararray);
> B = foreach A { c = UPPER(a); generate ((c eq 'TEST') ? 1 : 0), ((c eq 'DEV')
> ? 1 : 0); }
> {code}
> The Eval function UPPER is called twice for each record.
> This should be optimized so that the UPPER is called only once for each record
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