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Issuing two CREATE TABLE statements with a different name for one of the partition key columns leads to the following assertion failure on all replicas: scylla: schema.cc:363: schema::schema(const schema::raw_schema&, std::optional<raw_view_info>): Assertion `!def.id || def.id == id - column_offset(def.kind)' failed. The reason is that once the create table mutations are merged, the columns table contains two entries for the same position in the partition key tuple. If the schemas were the same, or not conflicting in a way which leads to abort, the current behavior would be to drop the older table as if the last CREATE TABLE was preceded by a DROP TABLE. The proposed fix is to make CREATE TABLE mutation include a tombstone for all older schema changes of this table, effectively overriding them. The behavior will be the same as if the schemas were not different, older table will be dropped. Fixes #11396 Closes #11398 * github.com:scylladb/scylladb: db: schema_tables: Make table creation shadow earlier concurrent changes db: schema_tables: Fix formatting db: schema_mutations: Make operator<<() print all mutations schema_mutations: Make it a monoid by defining appropriate += operator