Hi

The giant_polygon layer seems to return by default, without touching the 
publishing tab, this with GML 3.2:

numberMatched="unknown" numberReturned="0"

however, one feature is returned. Tested with Geoserver 2.25.2.

-Jukka Rahkonen-



Lähettäjä: Andrea Aime <andrea.a...@geosolutionsgroup.com>
Lähetetty: maanantai 17. kesäkuuta 2024 20.19
Vastaanottaja: Jody Garnett <jody.garn...@gmail.com>
Kopio: GeoServer Mailing List List <geoserver-users@lists.sourceforge.net>
Aihe: Re: [Geoserver-users] Omitting count(*) from WFS GetFeature request

I was testing main, but I guess I mixed GML 3.2 output format with a different 
version of WFS because... I cannot reproduce any longer LOL.
For reference, here is a layer where I disabled the count matched, using the 
WFS 2.0 default output format:

 curl 
"https://gs-main.geosolutionsgroup.com/geoserver/tiger/ows?service=WFS&version=2.0.0&request=GetFeature&typeName=tiger%3Apoi";

So... don't mind me...


Regards,

Andrea Aime



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On Mon, Jun 17, 2024 at 7:13 PM Jody Garnett 
<jody.garn...@gmail.com<mailto:jody.garn...@gmail.com>> wrote:
Thanks Andrea, I was getting the specification numbers confused.

I am trying to reproduce your "when setting it, the numberReturn is zero" with 
the 2.24.4 release in preflight testing...

  *   GeoServer 2.24.4 Layer Preview GML3.1: unknown
  *   GeoServer 2.24.4 Layer Preview GML3.2: unknown
  *   GeoServer 2.24.4 Layer Preview GML2: no count

What were you testing with that you got zero?
--
Jody Garnett


On Jun 17, 2024 at 12:34:46 AM, Andrea Aime 
<andrea.a...@geosolutionsgroup.com<mailto:andrea.a...@geosolutionsgroup.com>> 
wrote:
Hi Jody,
actually... the WFS 2.0 specification leaves out a possibility to return 
"unknown" in the count numberMatched field, from the schemas:

<xsd:attributeGroup name="StandardResponseParameters">
<xsd:attribute name="timeStamp" type="xsd:dateTime" use="required"/>
<xsd:attribute name="numberMatched" type="wfs:nonNegativeIntegerOrUnknown" 
use="required"/>
<xsd:attribute name="numberReturned" type="xsd:nonNegativeInteger" 
use="required"/>
<xsd:attribute name="next" type="xsd:anyURI"/>
<xsd:attribute name="previous" type="xsd:anyURI"/>
</xsd:attributeGroup>
<xsd:simpleType name="nonNegativeIntegerOrUnknown">
<xsd:union>
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="unknown"/>
</xsd:restriction>
</xsd:simpleType>
<xsd:simpleType>
<xsd:restriction base="xsd:nonNegativeInteger"/>
</xsd:simpleType>
</xsd:union>
</xsd:simpleType>



To use it, configure the layer to skip number matched (publishing/wfs):

[cid:ii_lxinpkvk0]
I believe this setting is not used often though, not sure how many clients are 
ready to receive "unknown" rather than a number.

I also see that when setting it, the numberReturned is zero... and it should 
not be, but I don't know why it's happening.


Regards,

Andrea Aime



==
GeoServer Professional Services from the experts!

Visit http://bit.ly/gs-services-us for more information.
==

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions Group
phone: +39 0584 962313

fax:     +39 0584 1660272

mob:   +39  339 8844549


https://www.geosolutionsgroup.com/

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 
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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 
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If you have received this email by mistake, please notify us immediately by 
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On Mon, Jun 17, 2024 at 8:06 AM Jody Garnett 
<jody.garn...@gmail.com<mailto:jody.garn...@gmail.com>> wrote:
It is part of GML specification. I have an idea of doing a count estimate for 
postgis, kind of like the box estimate. It would only break the spec a little 
as long as the answer is higher (until the last page when we would know for 
sure).

Can you try a different format that does not require count?


--
Jody Garnett


On Sun, Jun 16, 2024 at 10:54 PM Carsten Klein 
<c.kl...@datagis.com<mailto:c.kl...@datagis.com>> wrote:

Dear all,

is there a way to prevent GeoServer from issuing a count(*) on a layer's table 
(using PostGIS) for every GetFeature WFS request?

Those tables have > 50 million rows. The query itself, which is quite simple, 
is very fast as it's using an index (0.1 sec). However, including the count(*) 
performed by GeoServer, the overall request time is  ~3 secs.

Any advise is highly appreciated.

Carsten


--

Carsten Klein
Lead Software Engineer

DataGis GmbH

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