On Mon, Nov 21, 2022 at 12:38 PM Tom Lane <t...@sss.pgh.pa.us> wrote: > Andres Freund <and...@anarazel.de> writes: > > This can't quite be right - isn't this only applying the limit if we found a > > visible tuple? > > What it's restricting is the number of heap page fetches, which > might be good enough. We don't have a lot of visibility here > into how many index pages were scanned before returning the next > not-dead index entry, so I'm not sure how hard it'd be to do better.
Oh. That's really sad. Because I think the whole problem here is that the number of dead index entries can be huge. -- Robert Haas EDB: http://www.enterprisedb.com