Hi,
the rules here are a bit complex. In general GeoServer tries to make a
single query per layer to the data source by combining in OR the various
filters.
However, some data sources report errors or have very poor performance with
large/complex filters, so there is a hard-coded limit
of 20 combined filters to be sent to the database, if we go above, only the
BBOX filter is sent and all other filtering happens in memory.
This limit rarely needs tweaking so it's not exposed in the UI or
configuration, but if you need to change it, you can set a system
variable, servlet variable, or environment variable to alter it. It's
called MAX_FILTER_RULES.
For example, a system variable given to the JVM running GeoServer would
look like this:
-DMAX_FILTER_RULES=50
Cheers
Andrea
On Tue, Apr 25, 2017 at 5:28 PM, <[email protected]> wrote:
> Hi geoserver-community,
>
> My name is David, this is my first post in the list and I feel curious
> about how SLD styling works in Geoserver. I am styling some layers using
> YSLD files and I am using filters in my rules. These filters look like this:
>
> name: style_example
> title: projects
> feature-styles:
> - rules:
> - filter: ${ Attribute1 = 'Value A' AND status = 'Ok'}
> name: Ok
> symbolizers:
> - point:
> size: *size
> symbols:
> - mark:
> shape: circle
> fill-color: '#0000FF'
>
> I have lots of similar rules and the statement Attribute1 = ‘Value A’
> never changes.
> I have used the following way for working with variables:
>
> define: &attribute_name ${Attribute1 = 'Value A'}
> name: style_example2
> title: projects
> feature-styles:
> - rules:
> - filter: *attribute_name
> - filter: ${status = 'Ok'}
> name: Ok
> symbolizers:
> - point:
> size: *size
> symbols:
> - mark:
> shape: circle
> fill-color: '#0000FF'
>
> Would you know if Geoserver process these two types of styling in the same
> way? I mean, needs Geoserver to import the data twice when I use two
> filters in my rule instead of compounding the statements in only one filter?
>
> The next thing may it be related or not but, I have tried to compare the
> SLD version using the Rest API(Geoserver version 2.10.2), and I couldn’t be
> able to get the SLD version of my style:
> *http://localhost:8080/geoserver/**rest/**resource/workspaces/*
> *myworkspace**/styles**/yaml_**file_example**.**sld*
> <http://localhost:8080/geoserver/rest/resource/workspaces/myworkspace/styles/yaml_file_example.sld>
> Even though I am able to download the yaml version(native extension of the
> style) using the Rest API, I can not get the SLD (transformed) version of
> the style. I have the following answer from Geoserver:
> Undefined resource path.
> (However, I am able to get the SLD and YAML version of the example styles
> of Geoserver)
>
> Thank a lot,
> David
>
>
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