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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600231#action_12600231
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Santhosh Srinivasan commented on PIG-158:
-----------------------------------------

We have two kinds of nested operators now:

1. Subset of operators that are allowed inside foreach (filter, sort, distinct)
2. Operators that are allowed only within foreach (e.g.: A = B.x; A = B.(x, 
y);) but are not allowed outside the foreach

We need to cleanup the language to make it consistent.

> Rework logical plan
> -------------------
>
>                 Key: PIG-158
>                 URL: https://issues.apache.org/jira/browse/PIG-158
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: logical_operators.patch, logical_operators_rev_1.patch, 
> logical_operators_rev_2.patch, logical_operators_rev_3.patch, 
> parser_changes.patch, parser_changes_v1.patch, parser_changes_v2.patch, 
> parser_changes_v3.patch, parser_changes_v4.patch, ParserErrors.txt, 
> visitorWalker.patch
>
>
> Rework the logical plan in line with 
> http://wiki.apache.org/pig/PigExecutionModel

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