Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16797
how about we add a new SQL command to refresh the table schema in metastore
by inferring schema with data files? This is a compatibility issue and we
should have provided a way for users to migrate, before the 2.1 release. I
think this approach is much simpler than adding a flag.
For tables created by hive, as hive is a case-insensitive system, will the
parquet files have mixed-case schema?
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