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https://issues.apache.org/jira/browse/SPARK-9325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14744136#comment-14744136
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Reynold Xin commented on SPARK-9325:
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Are you only going to add collect, or are you going to add everything? We made
an intentional choice on the Java/Scala side not to have all the DataFrame
functions on Column, because it got pretty messy and it was hard to explain why
some columns were "computable", and some were not.
> Support `collect` on DataFrame columns
> --------------------------------------
>
> Key: SPARK-9325
> URL: https://issues.apache.org/jira/browse/SPARK-9325
> Project: Spark
> Issue Type: Sub-task
> Components: SparkR
> Reporter: Shivaram Venkataraman
>
> This is to support code of the form
> ```
> ages <- collect(df$Age)
> ```
> Right now `df$Age` returns a Column, which has no functions supported.
> Similarly we might consider supporting `head(df$Age)` etc.
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