Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/10541#issuecomment-168468512
@hvanhovell the problem with the json representation is stability. The json
one is pretty tied to our internal implementation, and as a result would be
hard to stabilize. Of course, we can also design our own stable json
representation, but at that point we are really just re-inventing the SQL wheel.
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