Alvaro Herrera <alvhe...@alvh.no-ip.org> writes: > On 2022-Sep-16, David Rowley wrote: >> I kinda disagree with Alvaro's fix in 05fb5d661. I think indexlist is >> the place to store these details. That commit added the following >> comment: >> >> /* >> * Ignore partitioned indexes, since they are not usable for >> * queries. >> */ >> >> But neither are hypothetical indexes either, yet they're added to >> RelOptInfo.indexlist. >> >> I think the patch should be changed so that the existing list is used >> and we find another fix for the problems Alvaro fixed in 05fb5d661. >> Unfortunately, there was no discussion marked on that commit message, >> so it's not quite clear what the problem was. I'm unsure if there was >> anything other than CLUSTER that was broken.
> After a bit of trawling through the archives, I found it here: > https://www.postgresql.org/message-id/20180124162006.pmapfiznhgngwtjf%40alvherre.pgsql > I think there was insufficient discussion and you're probably right that > it wasn't the best fix. I don't object to finding another fix. FWIW, I don't see any big problem with what you did. We'd need to do something more like what David suggests if the planner ever has a reason to consider partitioned indexes. But as long as it does not, why expend the time to build data structures representing them? And we'd have to add code in quite a few places to ignore them, once they're in indexlist. regards, tom lane
