On Mon, Mar 5, 2018 at 9:52 AM, Bernhard Kiselka <
bernhard.kise...@prisma-solutions.at> wrote:
> Hi Ian!
>
>
>
> Thanks for you answer!
>
>
>
> I understand that parsing 20KB takes some time.
>
> But why does in slow down exponentically (see digram in
> https://gis.stackexchange.com/a/82305 )?
>
Could be a result of the algorithm doing the parsing, or the in memory
representation building, or the filter simplification
in the middle, hard to say. For sure none of the filter management in
GeoTools was built with such a large filter in mind.
However, it's open source, so you can propose an improvement, or use
commercial support to have someone
else to do it for you.
I might be able to change the filter - but in fact this is a
> "simplification" for needing only the ID in the GeoServer layer (and not
> all attributes the filter relys on initially).
>
>
>
> I also had a look at the source code of GeoTools (guess
> https://github.com/geotools/geotools/blob/master/modules/
> library/main/src/main/java/org/geotools/filter/visitor/
> SimplifyingFilterVisitor.java is right), but I don't understand it
> completely.
>
That simplifies filters post parsing, it's one of the things that might be
scaling badly.
> Most of all I don't understand why GeoTools needs to parse a IN statement
> (and translates it to multiple ORs).
>
Because the OGC standard filter model has a fixed list of filters, and "IN"
is not one of them, pretty simple.
In the most recent versions of GeoServer there is also a "in" function that
can be encoded in SQL (in older version there is, but it is not recognized
by the SQL encoder as thus it's executed in memory instead of being turned
into SQL).
Regards,
Andrea Aime
==
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==
Ing. Andrea Aime
@geowolf
Technical Lead
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