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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602997#action_12602997
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Pi Song commented on PIG-158:
-----------------------------

So this way, you don't need to remove Generate.

> 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: is_null.patch, 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, udf_fix.patch, udf_funcSpec.patch, udf_return_type.patch, 
> user_func_and_store.patch, visitorWalker.patch
>
>
> Rework the logical plan in line with 
> http://wiki.apache.org/pig/PigExecutionModel

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