Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/5141#issuecomment-86904108
Unfortunately Hive is case insensitive and assumes all fields nullable
(including nested fields in complex types), while for Parquet both case
information and nullability are significant. That's one of the reason why we
need to reconcile Hive metastore schema and Parquet schema in
`ParquetRelation2`.
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