> Also, I recall discussion that select statements will touch the visibility > map (hence causing write I/O even in a read-only query) but [1] indicates > that only vacuum will set them ddl will clear them.
Hm, I don't recall that, but I've not been involved in the last few rounds of hacking on that mechanism.
I was confusing hint bits with the visibility map, sorry for the noise and/or confusion.
