Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22183
For Hive tables, column resolution is always case insensitive. However,
When `spark.sql.hive.convertMetastoreParquet` is true, users might face
inconsistent behaviors when they use native parquet reader to resolve the
columns in the case sensitive mode. We still introduce behavior changes. Better
error messages sounds good enough, instead of disabling
`spark.sql.hive.convertMetastoreParquet` when the mode is case sensitive.
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