[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-35126548
  
    @JoshRosen, can you review this and merge? This closes SPARK-1087 along 
with SPARK-972.