Hi Jim,
testing delegation works is not so hard, see this test class for an example:

https://github.com/geotools/geotools/blob/865cc72a90b07841a4c871d1b07fcc8e5defd35b/modules/library/main/src/test/java/org/geotools/data/crs/ReprojectFeatureResultsTest.java#L43

Cheers
Andrea


On Fri, Jun 8, 2018 at 7:02 PM, Jim Hughes <jhug...@ccri.com> wrote:

> Hi Andrea,
>
> I tossed up a PR here: https://github.com/geoserver/geoserver/pull/2905
> with a ticket https://osgeo-org.atlassian.net/browse/GEOS-8779.
>
> I am not seeing a quick way to provide a unit test.  If you (or anyone)
> has a suggestion on that front, I'm happy to include one.
>
> Cheers,
>
> Jim
>
>
> On 06/08/2018 12:49 PM, Andrea Aime wrote:
>
> Hi Jim,
> yes, properly implemented collection wrappers should allow delegation
>
> Cheers
> Andrea
>
> On Fri, Jun 8, 2018 at 6:47 PM, Jim Hughes <jhug...@ccri.com> wrote:
>
>> Andrea,
>>
>> Thanks for helping the PR through.
>>
>> I haven't tested out the first case completely.  I've definitely run into
>> the issue that Alvaro is trying to address with WFS 2.0.
>>
>> In the short term, is allowing the FC to delegate reasonable?
>>
>> Cheers,
>>
>> Jim
>>
>>
>> On 06/08/2018 12:07 PM, Andrea Aime wrote:
>>
>> 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/ge
>>> otools/blob/master/modules/library/main/src/main/java/org/ge
>>> otools/feature/visitor/UniqueVisitor.java
>>> https://github.com/geotools/geotools/blob/master/modules/lib
>>> rary/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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>>>
>>
>>
>> --
>>
>> Regards, Andrea Aime == GeoServer Professional Services from the experts!
>> Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
>> @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
>> Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
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>
>
> --
>
> Regards, Andrea Aime == GeoServer Professional Services from the experts!
> Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
> @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
> Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
> 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it
> ------------------------------------------------------- *Con riferimento
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-- 

Regards, Andrea Aime == GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
@geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it
------------------------------------------------------- *Con riferimento
alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 -
Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni
circostanza inerente alla presente email (il suo contenuto, gli eventuali
allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i
destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per
errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le
sarei comunque grato se potesse darmene notizia. This email is intended
only for the person or entity to which it is addressed and may contain
information that is privileged, confidential or otherwise protected from
disclosure. We remind that - as provided by European Regulation 2016/679
“GDPR” - copying, dissemination or use of this e-mail or the information
herein by anyone other than the intended recipient is prohibited. If you
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