Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/5714#issuecomment-97247359
So I talked with @marmbrus offline about this, and we actually think it
might be ok to just change all the lazy vals to defs (but keep the analyzed one
as lazy val), as you originally did, and not worry about performance at the
moment.
The problem with the current approach is that cache no longer mutates the
underlying dataframe, and users relying on the old dataframe reference will see
the same problem.
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