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

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

Sun Rui created SPARK-10047:
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             Summary: 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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