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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586849#action_12586849
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Shravan Matthur Narayanamurthy commented on PIG-158:
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Well what if you want to retain the state in the visitor before the other
walker is called? You would have to associate a stack for that too then. For
example a printer which wants to do pretty printing might want maintain the
depth it is currently running at. In this case, when the walker for the nested
plan is called, the depth in the visitor will be replaced by the depth of the
nested plan.
> 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,
> visitorWalker.patch
>
>
> Rework the logical plan in line with
> http://wiki.apache.org/pig/PigExecutionModel
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