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