Github user angelini commented on the pull request:
https://github.com/apache/spark/pull/7950#issuecomment-130485312
For the first part, if there was a flag to say: "Do not verify schema"
which would avoid the following block:
https://github.com/apache/spark/blob/master/python/pyspark/sql/context.py#L294-L298
that would be super useful.
We already type check our RDDs, so forcing an extra materialization is
unnecessary.
As for the erased timezone, that's too bad. Our frameworks enforces
timezones for every datetime so that might be a bit of a blocker for us. Maybe
we could make use of schema metadata (assuming all datetimes in a column are in
the same timezone).
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