[QGIS-Developer] Processing 3.0: Dropping the 'Select by attribute sum' alg?

[Alexander Bruy]

Let's remove it. It can be distributed as 3rd party plugin.

2017-09-05 4:56 GMT+03:00 Nyall Dawson <nyall.dawson at gmail.com>:
> Hi all,
>
> I'd like to propose that in processing in QGIS 3.0 we drop the 'Select
> by Attribute Sum' algorithm. As you're probably aware we've been
> cleaning up and streamlining the preinstalled algorithms that are
> provided with QGIS, and I think this algorithm is a good candidate for
> removal.
>
> (For clarification: this algorithm takes an input vector layer, field
> selection and numeric value. It requires a single selected feature is
> present in the input layer. It then loops through all neighbouring
> features and 'dissolves' them into the selected feature. As soon as
> the total attribute sum for all dissolved features exceeds the entered
> value, the algorithm is complete)
>
> My thoughts are:
> - The use case for this algorithm is very unclear for users - the name
> does not describe what the algorithm does, and there's no help
> documentation available for the algorithm either. Given this I suspect
> that the algorithm is not being put into use.
> - The algorithm needs enhancement to be more useful. There's no logic
> in place which dictates how neighbouring features are chosen to
> dissolve into the selected feature (it's effectively random - you're
> just as likely to get a huge narrow polygon stretching across a map as
> you are a nice compact cluster). To be more useful the algorithm would
> need logic to either minimise the area of the dissolved feature, or
> minimise the total number of dissolved features, or ... ?
>
> I think this algorithm should be moved to a processing plugin until
> it's matured and had these shortcomings addressed.
>
> Any thoughts?
>
> Nyall
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-- 
Alexander Bruy