Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1165#issuecomment-49685834
I see, we should revisit that, but probably later. IMO if you're going to
store them serialized, you're going to pay for that deserialization cost later
anyway. With the current logic we might just never cache them, even though a
serialized / compressed form may be reasonable in size.
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