Github user seancxmao commented on the issue:
https://github.com/apache/spark/pull/22343
It keeps Hive compatibility but loses performance benefit by setting
spark.sql.hive.convertMetastoreParquet=false. We can do better by enabling the
conversion and still keeping Hive compatibility. Though this makes our
implementation more complex, I guess most end users may keep
`spark.sql.hive.convertMetastoreParquet=true` and
`spark.sql.caseSensitive=false` which are default values, this brings benefits
to end users.
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