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In ALTER KEYSPACE, when a datacenter name is omitted, its replication factor is implicitly set to zero with vnodes, while with tablets, it remains unchanged. ALTER KEYSPACE should behave the same way for tablets as it does for vnodes. However, this can be dangerous as we may mistakenly drop the whole datacenter. Reject ALTER KEYSPACE if it changes replication factor, but omits a datacenter that currently contains tablet replicas. Fixes: https://github.com/scylladb/scylladb/issues/25549. Closes scylladb/scylladb#25731
All tests in this directory and its subdirectories were translated from Apache Cassandra's unit tests - the test/unit/org/apache/cassandra/cql3 directory in the Apache Cassandra source code repository. The organization of this directory mirrors that of the Cassandra directory, with test files renamed from SomeThingTest.java to some_thing_test.py. Individual files were translated in their entirety, and each individual file includes a comment on which version of the file was translated (Cassandra's tests continue to evolve, so we may later want to catch up with the differences). Please avoid adding new tests, not translated from Cassandra, in this directory. Instead, place new tests written from scratch for Scylla, or improved tests, in the directory above.