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https://issues.apache.org/jira/browse/PIG-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965491#action_12965491
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Daniel Dai commented on PIG-1747:
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Patch by itself looks good. Can you brief the difference of physical pattern
match vs logical patten match?
> pattern match classes for matching patterns in physical plan
> -------------------------------------------------------------
>
> Key: PIG-1747
> URL: https://issues.apache.org/jira/browse/PIG-1747
> Project: Pig
> Issue Type: Improvement
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
> Fix For: 0.9.0
>
> Attachments: PIG-1747.1.patch
>
>
> Map-reduce plan optimization phase of query planning in pig uses several
> visitors. Each of these visitors use custom code to identify patterns in
> physical plan to determine if the optimization should be applied. Having
> pattern match utility classes that works with physical plan will make writing
> new visitors easier.
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