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https://issues.apache.org/jira/browse/HIVE-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-9984:
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Attachment: HIVE-9984.2.patch
I don't think the HashMap is a good idea, IdentityHashMap is safer.
Made the memoization more obvious in the attached patch.
> JoinReorder's getOutputSize is exponential
> ------------------------------------------
>
> Key: HIVE-9984
> URL: https://issues.apache.org/jira/browse/HIVE-9984
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-9984.1.patch, HIVE-9984.2.patch
>
>
> Found by [~mmokhtar]. Causes major issues in large plans (50+ joins). Simple
> fix would be to memoize the recursion. There should also be a flag to switch
> this opt off.
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