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https://issues.apache.org/jira/browse/HIVE-4439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644220#comment-13644220
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Ashutosh Chauhan commented on HIVE-4439:
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jdbm was used way back in initial implementation of map-join and than
subsequently removed. This config variable doesn't do anything useful now.
+1 will commit if tests pass.
> Remove unused join configuration parameter: hive.mapjoin.cache.numrows
> ----------------------------------------------------------------------
>
> Key: HIVE-4439
> URL: https://issues.apache.org/jira/browse/HIVE-4439
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-4439.1.patch
>
>
> The description says:
> "How many rows should be cached by jdbm for map join."
> I can't find any reference to that parameter in the code however.
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