Marcus Eriksson created CASSANDRA-19615:
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             Summary: Merge pre-existing schema with the system defined one 
during upgrade
                 Key: CASSANDRA-19615
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19615
             Project: Cassandra
          Issue Type: Improvement
          Components: Transactional Cluster Metadata
            Reporter: Marcus Eriksson
            Assignee: Marcus Eriksson


When upgrading we should merge the pre-existing schema with the system-defined 
schema. For example, if a table was defined in 5.0 in system_distributed, but 
then removed from SystemDistributedKeyspace.java in 5.1 we should still be able 
to read it (until manually dropped).



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