Ah,
that change was controversial and the pull request sat there for ages
before being merged:
https://github.com/geoserver/geoserver/pull/2664
(shows me as the author, but it's not really me, I'm just unwillingly
involved because nobody else would take action)
Please discuss.
Cheers
Andrea
On Fri, Jun 8, 2018 at 5:57 PM, Jim Hughes <jhug...@ccri.com> wrote:
> Hi all,
>
> While testing out GeoMesa with GeoServer 2.13.x, we ran into some issues
> with the FeatureSizeFeatureCollection. I think there are two issues:
>
> First, for a layers backed by a large volume of data, getCount returning
> -1 is partially a way of saying that you don't want to count all the
> features;). Given this pattern, I'd suggest that the
> FeatureSizeFeatureCollection might be taken off the usual path completely.
> It looks like it might be an optimization when working with a bunch of
> little shapefiles.
>
> Second, WPSes can be implemented with a visitor pattern. For instance,
> the gs:Unique process leverages the GeoTools UniqueVisitor(1) which is
> recognized by the JDBC DataStores. (In GeoMesa, we do a bunch of similar
> things.)
>
> The fact that the current FeatureSizeFeatureCollection doesn't delegate
> prevents the UniqueProcess (and the GeoMesa ones) from working properly...
>
> In the short term, any objection to a PR which enables delegation for that
> FeatureCollection?
>
> Cheers,
>
> Jim
>
> 1. UniqueVisitor: https://github.com/geotools/
> geotools/blob/master/modules/library/main/src/main/java/
> org/geotools/feature/visitor/UniqueVisitor.java
> https://github.com/geotools/geotools/blob/master/modules/
> library/jdbc/src/main/java/org/geotools/jdbc/SQLDialect.java#L375
>
> p.s. I debugged this using PostGIS and the gs:Unique process. When the
> FeatureSizeFC was 'on', the queries did not have the 'distinct' keyword.
> When the FC was off, GeoServer did make a 'distinct' query.
>
>
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--
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