Very interesting idea... Perhaps a way to describe the sets of columns (clusters) and maybe even whether the cluster is row or column-oriented. But if you want

Very interesting idea... Perhaps a way to describe the sets of columns (clusters) and maybe even whether the cluster is row or column-oriented. But if you want to split the table between frequently and rarely accessed sets of columns you could just use a view to bring different types of tables together? Eg: a view that brings a row-oriented table together with a column-oriented one? Or row-oriented table together with an external table (storage). Obviously, DMLs would then become a little more complicated.