AngersZhuuuu edited a comment on issue #26141: [SPARK-29492][SQL]Reset HiveSession's SessionState conf's ClassLoader when sync mode URL: https://github.com/apache/spark/pull/26141#issuecomment-542925356 > I don't understand it enough to evaluate, really. Why is it different in 'sync' mode - do you mean not running in the background? yes， sync mode will just execute statement in the session thread and return OperationHandle after finish execute. Since all session thread have a ThreadLocal SessionState variable. when code running to HiveTableScanExec#addColumnMetadataToConf , it will use this SessionState variable. So we need to reset it.
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