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https://issues.apache.org/jira/browse/SPARK-8844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628093#comment-14628093
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Apache Spark commented on SPARK-8844:
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User 'sun-rui' has created a pull request for this issue:
https://github.com/apache/spark/pull/7419
> head/collect is broken in SparkR
> ---------------------------------
>
> Key: SPARK-8844
> URL: https://issues.apache.org/jira/browse/SPARK-8844
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 1.5.0
> Reporter: Davies Liu
> Priority: Blocker
>
> {code}
> > t = tables(sqlContext)
> > showDF(T)
> Error in (function (classes, fdef, mtable) :
> unable to find an inherited method for function ‘showDF’ for signature
> ‘"logical"’
> > showDF(t)
> +---------+-----------+
> |tableName|isTemporary|
> +---------+-----------+
> +---------+-----------+
> > 15/07/06 09:59:10 WARN Executor: Told to re-register on heartbeat
> >
> >
> > head(t)
> Error in readTypedObject(con, type) :
> Unsupported type for deserialization
> > collect(t)
> Error in readTypedObject(con, type) :
> Unsupported type for deserialization
> {code}
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