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https://issues.apache.org/jira/browse/SPARK-10904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940416#comment-14940416
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Felix Cheung commented on SPARK-10904:
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I added that line of comment on "df$age" I could clarify that.
I think we should make `select(df, c("col1", "col2"))` work
> select(df, c("col1", "col2")) fails
> -------------------------------------
>
> Key: SPARK-10904
> URL: https://issues.apache.org/jira/browse/SPARK-10904
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 1.5.0
> Reporter: Weiqiang Zhuang
>
> The help page for 'select' gives an example of
> select(df, c("col1", "col2"))
> However, this fails with assertion:
> java.lang.AssertionError: assertion failed
> at scala.Predef$.assert(Predef.scala:165)
> at org.apache.spark.api.r.SerDe$.readStringBytes(SerDe.scala:92)
> at org.apache.spark.api.r.SerDe$.readString(SerDe.scala:99)
> at org.apache.spark.api.r.SerDe$.readTypedObject(SerDe.scala:63)
> at org.apache.spark.api.r.SerDe$.readObject(SerDe.scala:52)
> at
> org.apache.spark.api.r.RBackendHandler$$anonfun$readArgs$1.apply(RBackendHandler.scala:182)
> at
> org.apache.spark.api.r.RBackendHandler$$anonfun$readArgs$1.apply(RBackendHandler.scala:181)
> And then none of the functions will work with following error:
> > head(df)
> Error in if (returnStatus != 0) { : argument is of length zero
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