Re: Assert failure on 'list_member_ptr(rel->joininfo, restrictinfo)'

Andrei Lepikhov писал(а) 2023-12-08 07:37:
> I'd already clashed with Tom on copying the required_relids field and
> voluntarily made unnecessary copies in the project [1].
> And ... stuck into huge memory consumption. The reason was in
> Bitmapsets:
> When we have 1E3-1E4 partitions and try to reparameterize a join, one
> bitmapset field can have a size of about 1kB. Having bitmapset
> referencing Relation with a large index value, we had a lot of (for
> example, 1E4 * 1kB) copies on each reparametrization of such a field.
> Alexander Pyhalov should remember that case.

Yes. If it matters, this happened during reparametrization when 2
partitioned tables with 1000 partitions each were joined. Then
asymmetric  pw join managed to eat lots of memory for bitmapsets (by
lots of memory I mean all available on the test VM).