What is the role of a Hive metastore schema version?
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The Hive metastore schema version is used to keep track of changes to the Hive metastore database schema. When a new version of Hive is released, it may include changes to the metastore schema. If you upgrade to the new version, you will need to update the metastore schema version to ensure that the metastore is compatible with the new version of Hive.