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https://issues.apache.org/jira/browse/SPARK-9325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025611#comment-15025611
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Hossein Falaki commented on SPARK-9325:
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To help R users and not open up the API, how about adding head and collect
functions for Column, that just print out a warning that explain how to do it
the "right" way:
{code}
collect(df$Col)
Warning: DataFrame Column may be not be materialized. Please use
collect(select(df, df$Col))
{code}
> 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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