Github user holdenk commented on the issue:
https://github.com/apache/spark/pull/16537
I definitely think moving errors earlier is important (nothing is worse
than a 9 hour job that fails in the middle because of the wrong type). That
being said in this case the error isn't caught any earlier though. I think
doing this selectively in the cases where it makes sense would be good, I just
don't want to spend a lot of time adding type checks in places where they don't
give us a lot.
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