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https://issues.apache.org/jira/browse/SPARK-12068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-12068.
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Resolution: Fixed
Fix Version/s: 1.6.0
Issue resolved by pull request 10059
[https://github.com/apache/spark/pull/10059]
> use a single column in Dataset.groupBy and count will fail
> ----------------------------------------------------------
>
> Key: SPARK-12068
> URL: https://issues.apache.org/jira/browse/SPARK-12068
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Wenchen Fan
> Fix For: 1.6.0
>
>
> {code}
> val ds = Seq("a" -> 1, "b" -> 1, "a" -> 2).toDS()
> val count = ds.groupBy($"_1").count()
> count.collect() // will fail
> {code}
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