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Oscar D. Lara Yejas edited comment on SPARK-17774 at 10/5/16 2:48 AM: ---------------------------------------------------------------------- I concur with [~shivaram]. Besides, I already implemented method head() in my PR 11336: https://github.com/apache/spark/pull/11336 If you wanted to implement method head() alone, you'll still need to do all changes I did for PR 11336 except for the 5 lines of code of method collect(). If that's the case, I'd rather suggest to merge PR 11336. [~falaki]: In the corner cases where there's no parent DataFrame, we can return an empty value as opposed to throwing an error. This behavior is already implemented in PR 11336. Also, though R doesn't have method collect(), I think it's still useful to turn a Column into an R vector. Perhaps a function called as.vector()? Thanks folks! was (Author: olarayej): [~shivaram]: I concur with Shivaram. Besides, I already implemented method head() in my PR 11336: https://github.com/apache/spark/pull/11336 If you wanted to implement method head() alone, you'll still need to do all changes I did for PR 11336 except for the 5 lines of code of method collect(). If that's the case, I'd rather suggest to merge PR 11336. [~falaki]: In the corner cases where there's no parent DataFrame, we can return an empty value as opposed to throwing an error. This behavior is already implemented in PR 11336. Also, though R doesn't have method collect(), I think it's still useful to turn a Column into an R vector. Perhaps a function called as.vector()? Thanks folks! > Add support for head on DataFrame Column > ---------------------------------------- > > Key: SPARK-17774 > URL: https://issues.apache.org/jira/browse/SPARK-17774 > Project: Spark > Issue Type: Sub-task > Components: SparkR > Affects Versions: 2.0.0 > Reporter: Hossein Falaki > > There was a lot of discussion on SPARK-9325. To summarize the conversation on > that ticket regardign {{collect}} > * Pro: Ease of use and maximum compatibility with existing R API > * Con: We do not want to increase maintenance cost by opening arbitrary API. > With Spark's DataFrame API {{collect}} does not work on {{Column}} and there > is no need for it to work in R. > This ticket is strictly about {{head}}. I propose supporting {{head}} on > {{Column}} because: > 1. R users are already used to calling {{head(iris$Sepal.Length)}}. When they > do that on SparkDataFrame they get an error. Not a good experience > 2. Adding support for it does not require any change to the backend. It can > be trivially done in R code. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org