PG Doc comments form <noreply(at)postgresql(dot)org> writes:
> In the documentation on
> https://www.postgresql.org/account/comments/new/15/indexes-multicolumn.html/
> Constraints on columns to the right of these columns are checked in the
> index, so they save visits to the table proper, but they do not reduce the
> portion of the index that has to be scanned.
> "so they save visits to the table proper" should be "so they save visits to
> the table heap".
Doesn't seem like an improvement from here, especially not with one
eye on the non-heap table AMs that are being worked on.
regards, tom lane