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47ca280e57
Static compact tables are tables with compact storage and no clustering columns. Before this patch, Scylla was writing rows of static compact tables as clustered rows instead of static rows. That's because in our in-memory model such tables have regular rows and no static row. In Cassandra's schema (since 3.x), those tables have columns which are marked as static and there are no regular columns. This worked fine as long as Scylla was writing and reading those sstables. But when importing sstables from Cassandra, our reader was skipping the static row, since it's not present in the schema, and returning no rows as a result. Also, Cassandra, and Scylla tools, would have problems reading those sstables. Fix this by writing rows for such tables the same way as Cassandra does. In order to support rolling downgrade, we do that only when all nodes are upgraded. Fixes #4139.