[mapserver-dev] Implement getNumFeatures for some drivers

Tamas Szekeres szekerest at gmail.com
Mon Apr 30 15:34:09 PDT 2018

Created a pull request with the suggested changes:


Keen to have it included in 7.2 if that's sufficient.



2018-04-28 0:48 GMT+02:00 Lime, Steve D (MNIT) <steve.lime at state.mn.us>:

> A filter is basically a where statement so I think it should be
> considered...
> ------------------------------
> *From:* mapserver-dev <mapserver-dev-bounces at lists.osgeo.org> on behalf
> of Tamas Szekeres <szekerest at gmail.com>
> *Sent:* Sunday, April 22, 2018 2:36:44 PM
> *To:* mapserver-dev at lists.osgeo.org
> *Subject:* [mapserver-dev] Implement getNumFeatures for some drivers
> Hi Devs,
> Currently getNumFeatures is supported by the inline layers only. Would
> that be sufficient to implement this for some other drivers, like  MSSQL,
> PostGIS and OGR?
> The database drivers would probably rely on the count() aggegate in the
> SQL query, while we could use  OGR_L_GetFeatureCount for the OGR layers.
> I could also imagine a default implementation if we use whichShapes on the
> layer extent and iterate the shapes to calculate the count.
> It is also a question whether getNumFeatures should consider the layer
> filter or not.
> Best regards,
> Tamas
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