Zoltan Chovan created HIVE-23391:

             Summary: Change requested lock for ALTER TABLE ADD COLUMN to 
                 Key: HIVE-23391
                 URL: https://issues.apache.org/jira/browse/HIVE-23391
             Project: Hive
          Issue Type: Improvement
            Reporter: Zoltan Chovan

A long running query can block a simple add column query, as the add column 
will require a DDL_EXCLUSIVE lock currently. By changing this to a shared lock, 
this metadata only query can be executed without having to wait for the 
previous query to finish.

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