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https://issues.apache.org/jira/browse/PIG-827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates resolved PIG-827.
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Resolution: Fixed
The new optimizer and plan structure introduced in 0.7 cover this.
> Redesign graph operations in OperatorPlan
> -----------------------------------------
>
> Key: PIG-827
> URL: https://issues.apache.org/jira/browse/PIG-827
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Affects Versions: 0.3.0
> Reporter: Santhosh Srinivasan
>
> The graph operations swap, insertBetween, pushBefore, etc. have to be
> re-implemented in a layered fashion. The layering will facilitate the re-use
> of operations. In addition, use of operator.rewire in the aforementioned
> operations requires transaction like ability due to various pre-conditions.
> Often, the result of one of the operations leaves the graph in an
> inconsistent state for the rewire operation. Clear layering and assignment of
> the ability to rewire will remove these inconsistencies. For now, use of
> rewire has resulted in a slightly less maintainable code along with the
> necessity to use rewire with discretion.
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