Github user danielfx90 commented on the issue:
https://github.com/apache/spark/pull/19238
@gatorsmile if Hive lies on the same infrastructure as the application,
then the metastore should definitely solve the issue, but a connection over
JDBC is needed when data comes from an external source which **only** exposes
such a connection through its Hive server. We encountered this and ended up
adding the HiveDialect to solve it.
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