Zoltan Chovan created HIVE-23391:
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Summary: Change requested lock for ALTER TABLE ADD COLUMN to
DDL_SHARED
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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