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## What changes were proposed in this pull request? Bugfix from [SPARK-19540.](https://github.com/apache/spark/pull/16826) Cloning SessionState does not clone query execution listeners, so cloned session is unable to listen to events on queries. ## How was this patch tested? - Unit test Author: Kunal Khamar <kkhamar@outlook.com> Closes #17379 from kunalkhamar/clone-bugfix. |
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