Why not using joined fields ? Caching mechanism already exists there. Le mer. 30 déc. 2015 8:18 PM, Stefan Ziegler <stefan.ziegler...@gmail.com> a écrit :
> Hi Nyall > > I compared 2.12 with current master. But I don't see an improvement. > Opening the attribute table takes around 10 seconds for layers with approx. > 2000 features with one virtual field (with the attribute(get_feature()) > expression). Rendering is also really slow when using rule based renderer > on the virtual field. > > regards > Stefan > > On Wed, Dec 30, 2015 at 7:22 PM, Nyall Dawson <nyall.daw...@gmail.com> > wrote: > >> >> On 31 Dec 2015 2:01 AM, "Stefan Ziegler" <stefan.ziegler...@gmail.com> >> wrote: >> > >> > Hi >> > >> > I add a virtual field to a layer with e.g. following expression >> > >> > attribute(get_feature('pnf_pnf','t_id',afrom),'year') >> > >> > This works really great. Then I'm using this new virtual field for >> filtering the features in the rule based renderer. How does affect this the >> rendering performance? It seems that it really slows down rendering even >> with layers with only approx 600 features each. >> > >> > If so, can the speed improved with e.g. some to develop caching >> mechanism? >> >> Try with the current master version - this should be MUCH faster now. I'd >> love to hear any feedback of how you find the changes improve (or don't >> improve!) your situation. >> >> Nyall >> >> > >> > regards >> > Stefan >> > >> > _______________________________________________ >> > Qgis-developer mailing list >> > Qgis-developer@lists.osgeo.org >> > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer >> > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer >> > > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer
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