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https://issues.apache.org/jira/browse/PIG-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935445#action_12935445
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Daniel Dai commented on PIG-1742:
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+1
> org.apache.pig.newplan.optimizer.Rule.java does not work with plan patterns
> where leaves/sinks are not siblings
> ---------------------------------------------------------------------------------------------------------------
>
> Key: PIG-1742
> URL: https://issues.apache.org/jira/browse/PIG-1742
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.8.0
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
> Fix For: 0.9.0
>
> Attachments: PIG-1742.1.patch
>
>
> Rule.java which is used for finding patterns in the logical plan during
> logical plan optimization does not work with patterns where the leaves/sinks
> in the patter are not siblings.
> For eg, it will not work with a pattern such as -
> {code}
> A->B
> |-> C -> D
> In this example, B and D are leaves, but not siblings.
> {code}
> In org.apache.pig.newplan.optimizer.Rule.java, the code in the for loop at
> line 138 (in this revision -
> http://svn.apache.org/viewvc/pig/trunk/src/org/apache/pig/newplan/optimizer/Rule.java?annotate=1005230)
> checks if the leaves in the pattern are are sibling of the node that
> matched. This is an undocumented limitation. Note that none of the existing
> logical plan optimization rules have such a patter, so this issue does not
> have any impact on the user.
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