[jira] [Commented] (SPARK-10047) Improve the implementation of collect() on DataFrame in SparkR

["Sun Rui (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699108#comment-14699108 ] 

Sun Rui commented on SPARK-10047:
---------------------------------

[~shivaram], [~yu_ishikawa] lets discuss improvement of collect() of DataFrame here.

> Improve the implementation of collect() on DataFrame in SparkR
> --------------------------------------------------------------
>
>                 Key: SPARK-10047
>                 URL: https://issues.apache.org/jira/browse/SPARK-10047
>             Project: Spark
>          Issue Type: Improvement
>          Components: SparkR
>            Reporter: Sun Rui
>
> currently in SparkR, collect() on a DataFrame collects the data within the DataFrame into a local data.frame. R users are used to using data.frame.
> However, collect() currently can't collect data of nested types from a DataFrame because:
> 1. The serializer in JVM backend does not support nested types;
> 2. collect() in R side assumes each column is of simple atomic type that can be combinded into a atomic vector



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