[GitHub] incubator-spark pull request: Added extra description on ValueErro...

[jyotiska]

Github user jyotiska commented on the pull request:

    https://github.com/apache/incubator-spark/pull/581#issuecomment-34782466
  
    This tries to solve 
[SPARK-972](https://spark-project.atlassian.net/browse/SPARK-972)