Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/5030#issuecomment-106566761
Sorry @deenar for not responding earlier. I somehow missed your message
until this close came.
I was talking about this - the reason is I'm not sure if this should be the
API to encourage users to use. This API relies on Java serialization for
persisting data, which is not a stable protocol and is also very expensive.
Saving nested structured data out using Parquet/ORC or even JSON is probably
better from a compatibility point of view, and from a performance point of view.
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