They are not, unfortunately (fortunately?). Just a standard table.
If it helps, the autovacuum always seems to be in the phase "cleaning up indexes" when I look at pg_stat_progress_vacuum.
> On Mar 6, 2018, at 5:25 PM, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
>
> Are the relations that autovacuum is
> processing materialized views?