Hi Travis,
the filter system does not have an official extension point for a store
specific functionality.
However, there's way that we already used for Oracle in order to handle a
KNN search that cannot
be made available as a filter (like, it does not have a semantic matching
any of the existing filters).
It has been implemented as an empty geotools function:
https://github.com/geotools/geotools/blob/7353125d50adff57fbfc3548a7426b67e2ff13db/modules/plugin/jdbc/jdbc-oracle/src/main/java/org/geotools/filter/function/FilterFunction_sdonn.java
Then the encoder knows what to do with it:
https://github.com/geotools/geotools/blob/7353125d50adff57fbfc3548a7426b67e2ff13db/modules/plugin/jdbc/jdbc-oracle/src/main/java/org/geotools/data/oracle/OracleFilterToSQL.java#L166
The function unfortunately shows up as a generic one, but if you try to use
it against anything but Oracle it fails
(the name should help with that "SDO" should be known to Oracle users, and
the function only shows up if the Oracle module is plugged in).
Hope this helps
Cheers
Andrea
On Mon, Nov 27, 2017 at 7:29 PM, Travis Brundage <[email protected]
> wrote:
> Greetings all,
>
> I've been working on developing a new JDBC DataStore for HP Vertica
> databases. Thus far, I seem to be successful in getting a new connection
> and ability to import data, but now I've been trying to work on getting the
> database's custom commands used by GeoServer. I'm a bit ignorant in how
> this works.
>
> Currently, I have a custom FilterToSQL class, VerticaFilterToSQL, which
> interprets an "Intersects" filter to write out an ST_Intersects command, in
> accordance with the database's specifications. This part makes sense, as it
> is a binary spatial operator comparing two geometries.
>
> However, I am attempting to write a custom function called STV_Intersects
> <https://my.vertica.com/docs/8.1.x/HTML/index.htm#Authoring/AnalyzingData/Geospatial/GeospatialAnalytics/STV_IntersectScalarFunctionVs.TransformFunction.htm>
> (documentation linked - there's actually two versions but my question is
> general for both). This function does not simply compare two geometries,
> but actually looks at the entire table for intersecting polygons.
>
> The best I have come up with thus far is that perhaps I need to write a
> custom visitor, as it does not fall under visitBinarySpatialOperator.
>
> Would anyone have any suggestions or pointers in the right direction for
> me regarding how to write a custom function like this?
>
> Cheers,
> Travis
>
> --
> Travis Brundage
> Software Engineer | Boundless
> [email protected]
> 250.888.2820 <(250)%20888-2820>
> @boundlessgeo
>
>
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--
Regards,
Andrea Aime
==
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==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
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