sercanCyberVision opened a new pull request, #4305:
URL: https://github.com/apache/hive/pull/4305

   ### What changes were proposed in this pull request?
   This is to backport https://issues.apache.org/jira/browse/HIVE-21085 to 
`branch-3.1`.
   
   ### Why are the changes needed?
   Materialized views registry creates Tez session without checking external 
sessions pool. This causes double-session creation when Hive CLI is launched.
   
   This is reported here https://issues.apache.org/jira/browse/HIVE-27318
   
   The issue has been resolved for Hive-4, but persists in Hive-3.
   
   ### Does this PR introduce _any_ user-facing change?
   No, this is internal functionality.
   
   ### How was this patch tested?
   Built the project and made sure that there was only one session after Hive 
CLI launch.
   


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