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https://issues.apache.org/jira/browse/HIVE-12074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14953494#comment-14953494
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Wei Zheng commented on HIVE-12074:
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Test mismatches above indicate the tests in which Hybrid join is disabled by
this patch.
> Conditionally turn off hybrid grace hash join based on est. data size, etc
> --------------------------------------------------------------------------
>
> Key: HIVE-12074
> URL: https://issues.apache.org/jira/browse/HIVE-12074
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.0, 1.2.1
> Reporter: Wei Zheng
> Assignee: Wei Zheng
> Attachments: HIVE-12074.1.patch
>
>
> Currently, as long as the below flag is set to true, we always do grace hash
> join for map join. This may not be necessary, esp. for cases where the data
> size is quite small, and number of distinct values is also small.
> hive.mapjoin.hybridgrace.hashtable
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