> > This seems to be the source of the misestimation. You might
> > want to try using "n WHERE n.nodein NOT IN (SELECT nodeid
> > FROM templates)" instead of "n LEFT JOIN templates USING
> > (nodeid) WHERE templates.nodeid IS NULL" and see if it helps.
>
> it helped, the new version of the query takes 2303 ms on both
> 8.1.4 and 8.2.4.
this is very interesting. on 8.1.x i have also repeatedly had to rewrite
joins as their equivalent IN/NOT IN alternatives in order to improve
performance, so i feel that at least under some alignments of the
planets 8.1 has similar problems.
george
