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72bb3113ac
Add a new next_replication column to system_schema.keyspaces table. While there is an ongoing RF change: - next_replication keeps the target RF values; - existing replication_v2 column keeps initial RF values - the ones we started the RF change with. DESCRIBE KEYSPACE statement shows replication_v2. When there is no ongoing RF change for this keyspace, its next_replication is empty. In this commit no data is kept in the new column.