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f58c2dec1e
The version needs to change value not only on structural changes but also temporal. This is needed for nodes to detect if the version they see was already synchronized with or not even if it has the same structure as the past versions. We also need to end up with the same version on all nodes when schema changes are commuted. For regular mutable schemas version will be calculated from underlying mutations when schema is announced. For static schemas of system keyspace it is calculated by hashing scylla version and column id, because we don't have mutations at the time of building the schema.