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https://issues.apache.org/jira/browse/HIVE-8970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230470#comment-14230470
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Chao commented on HIVE-8970:
----------------------------

Yes, I believe so. When I enable mapjoin, I compared the unit test results 
against the previous results in the spark branch, which was previously compared 
against the MR results. 

> Enable map join optimization only when hive.auto.convert.join is true [Spark 
> Branch]
> ------------------------------------------------------------------------------------
>
>                 Key: HIVE-8970
>                 URL: https://issues.apache.org/jira/browse/HIVE-8970
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Chao
>            Assignee: Chao
>             Fix For: spark-branch
>
>         Attachments: HIVE-8970.1-spark.patch, HIVE-8970.2-spark.patch, 
> HIVE-8970.3-spark.patch
>
>
> Right now, in Spark branch we enable MJ without looking at this 
> configuration. The related code in {{SparkMapJoinOptimizer}} is commented 
> out. We should only enable MJ when the flag is true.



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