[Qgis-user] The new temporal controller

[Cory Albrecht]

Nyall,

I use separate fields for start and end. I say it doesn't appear to be
filtering on the provider side via SQL WHERE clause thanks to
https://github.com/qgis/QGIS/issues/39798 which allows me to see that
everything in the layer is there.

On Sun, Nov 8, 2020 at 9:59 PM Nyall Dawson <nyall.dawson at gmail.com> wrote:

> On Mon, 9 Nov 2020 at 12:04, Cory Albrecht <maps at hanfastolfe.com> wrote:
> >
> > Playing around with the new temporal controller I notice that it loads
> all features from a layer and then (I'm guessing) filters them in memory to
> draw on the canvas. I noticed it because I disconnected my laptop to go
> work from the couch while we watched some TV and my data is in a a PostGIS
> database. My complex is absolutely filled with wifi APs so collisions are
> rampant and speed is horrible, but with the old Time Manager plugin it was
> doable because it added a filter that only loaded from the DB the features
> that were necessary instead of all of them. That method of Time Manager
> also made things doubly snappy over the gigabit wired link compared to
> 117Mbps on WiFi.
>
> That's only the case in very rare circumstances - usually the filter
> is indeed handed off to the underlying database in order to utilise
> whatever indices have been setup there. What temporal settings do you
> have on your layer?
>
> Nyall
>
>
> >
> > Perhaps the temporal controller could use that idea to manage things
> better? Could it possibly help with tickets like 39856 and 39798? Also, I
> notice that the attributes table for temporal labels also has all features,
> even the ones that are not showing, and that is confusing.
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