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https://issues.apache.org/jira/browse/HIVE-970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797752#action_12797752
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Namit Jain commented on HIVE-970:
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Yes, you can close this as a duplicate
> mapjoin should be disabled if the size is too large
> ---------------------------------------------------
>
> Key: HIVE-970
> URL: https://issues.apache.org/jira/browse/HIVE-970
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Ning Zhang
>
> Based on a detailed discussion with Ning, we were thinking of the following.
> Add a configurable parameter, which sets the limit on the usage of mapjoin.
> Assume that only the following can increase the size of the table:
> UDTF, Transforms, Union, Join
> (Although UDF and UDAF can also increase the total size by increasing the
> size of the row, that is not likely to happen in the common case).
> So, the map join hint will only be honored if none of the above are present
> at the source and the size of the table is less than the limit.
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