AngersZhuuuu opened a new pull request #26141: [SPARK-29492][SQL]Reset HiveSession's SessionState conf's ClassLoader when sync mode URL: https://github.com/apache/spark/pull/26141 ### What changes were proposed in this pull request? When we use pyhive connect to SparkThriftServer, it will run statement in sync mode. When we query data of hive table , it will check serde class in HiveTableScanExec#addColumnMetadataToConf https://github.com/apache/spark/blob/5a482e72091c8db940408905e8c044f7f5d7814f/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScanExec.scala#L123 Since we run statement in sync mode, it will use HiveSession's SessionState, and use it's conf's classLoader. then error happened. We should reset it when we start run sql in sync mode. ### Why are the changes needed? Fix bug ### Does this PR introduce any user-facing change? NO ### How was this patch tested? UT
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