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https://issues.apache.org/jira/browse/SPARK-18134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15682730#comment-15682730
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Takeshi Yamamuro commented on SPARK-18134:
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In v1.5, the comparison and ordering of map-types has been dropped in
SPARK-9415. Not exactly sure why this feature dropped though, ISTM one of
reasons is a performance issue; we couldn't find an efficient way to compare
map-typed data (see: https://github.com/apache/spark/pull/13847)
> 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
> Reporter: Christian Zorneck
>
> 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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