[jira] [Commented] (SPARK-12068) use a single column in Dataset.groupBy and count will fail

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033175#comment-15033175 ] 

Apache Spark commented on SPARK-12068:
--------------------------------------

User 'cloud-fan' has created a pull request for this issue:
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
>
> {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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