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From "Weiqiang Zhuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-10904) select(df, c("col1", "col2")) fails
Date Thu, 01 Oct 2015 19:17:26 GMT

    [ https://issues.apache.org/jira/browse/SPARK-10904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940263#comment-14940263
] 

Weiqiang Zhuang commented on SPARK-10904:
-----------------------------------------

Here you go:

sc <- sparkR.init()
sqlContext <- sparkRSQL.init(sc)
df <- createDataFrame(sqlContext, iris) 
select(df, c("Sepal_Width","Sepal_Length"))

>   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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