Github user zuotingbing commented on the issue:
https://github.com/apache/spark/pull/20029
It seems each time when connect to thrift server through beeline, the
`SessionState.start(state)` will be called two times. one is in
`HiveSessionImpl:open` , another is in `HiveClientImpl.newSession()` for
`sql("use default")` . When close the beeline connection, only close the
HiveSession with `HiveSessionImpl.close()`, but the object of
`HiveClientImpl.newSession()` will be left over.
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