Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11141#issuecomment-182089327
In the past, we had a planner to insert a ConvertToUnsafe and ConvertToSafe
for operators that expect UnsafeRow or SafeRow, that is removed to simplify
complexity, maybe we need to bring that back for the parquet reader? see #10511
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