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This is a translation of Cassandra's CQL unit test source file validation/operations/AlterTest.java into our our cql-pytest framework. This test file includes 24 tests for various types of ALTER operations (of keyspaces, tables and types). Two additional tests which required multiple data centers to test were dropped with a comment explaining why. All 24 tests pass on Cassandra, with 8 failing on Scylla reproducing one already known Scylla issue and 5 previously-unknown ones: Refs #8948: Cassandra 3.11.10 uses "class" instead of "sstable_compression" for compression settings by default Refs #9929: Cassandra added "USING TIMESTAMP" to "ALTER TABLE", we didn't. Refs #9930: Forbid re-adding static columns as regular and vice versa Refs #9935: Scylla stores un-expanded compaction class name in system tables. Refs #10036: Reject empty options while altering a keyspace Refs #10037: If there are multiple values for a key, CQL silently chooses last value Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20220206163820.1875410-2-nyh@scylladb.com>