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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