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https://issues.apache.org/jira/browse/HIVE-1626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876298#comment-15876298
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Edward Capriolo commented on HIVE-1626:
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IT is not as easy as it seems. Many usages for example are in antlr generated
classes and such.
> stop using java.util.Stack
> --------------------------
>
> Key: HIVE-1626
> URL: https://issues.apache.org/jira/browse/HIVE-1626
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.7.0
> Reporter: John Sichi
> Assignee: Edward Capriolo
>
> We currently use Stack as part of the generic node walking library. Stack
> should not be used for this since its inheritance from Vector incurs
> superfluous synchronization overhead.
> Most projects end up adding an ArrayStack implementation and using that
> instead.
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