[GitHub] spark pull request: [SPARK-9325][SPARK-R] collect() head() and sho...

[sun-rui <gi...@git.apache.org>]

Github user sun-rui commented on the pull request:

    https://github.com/apache/spark/pull/11336#issuecomment-190526619
  
    @olarayej, I am not sure if it is conceptually correct to associate a Column to only one DF. Conceptually, a Column could be depend on 0, 1, 2 or more DataFrames. For example:
    c1 <- df1$c1
    c2 <- df2$c2
    c3 < - c1 + c2



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