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https://issues.apache.org/jira/browse/SPARK-18134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394787#comment-16394787
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Takeshi Yamamuro commented on SPARK-18134:
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Sorry for interrupting you, but the current proposed pr 
(https://github.com/apache/spark/pull/19330#issuecomment-356787180) touched the 
stable interface in MapType, so it seems this ticket is weakly blocked until 
the next major release, I think.

> SQL: MapType in Group BY and Joins not working
> ----------------------------------------------
>
>                 Key: SPARK-18134
>                 URL: https://issues.apache.org/jira/browse/SPARK-18134
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 2.0.0, 2.0.1, 
> 2.1.0
>            Reporter: Christian Zorneck
>            Priority: Major
>
> Since version 1.5 and issue SPARK-9415, MapTypes can no longer be used in 
> GROUP BY and join clauses. This makes it incompatible to HiveQL. So, a Hive 
> feature was removed from Spark. This makes Spark incompatible to various 
> HiveQL statements.



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