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https://issues.apache.org/jira/browse/SPARK-4235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15414711#comment-15414711
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Dongjoon Hyun commented on SPARK-4235:
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This issue seems to mention Hive UnionTypes.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-UnionTypes
According to the above document, the implementation of Hive is still incomplete.
> Add union data type support
> ---------------------------
>
> Key: SPARK-4235
> URL: https://issues.apache.org/jira/browse/SPARK-4235
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Cheng Hao
>
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