Hi,
I have just prepared a pull request (
https://github.com/geoserver/geoserver/pull/618) for a WPS process that
extracts unique values from a SimpleFeatureCollection attribute, with
pagination functionality.
The process takes advantage of some optimizations done on Geotools
JDBCDataStore to allow executing the unique extraction with pagination
directly on db.
We did not extend the existing Unique process, because to have pagination
we needed an output containing both the list of unique values and the total
# of values, without pagination applied.
As per previous discussion on the ml we did not find an easy solution to
have that information added to the GML output of the original Unique
process.
Currently we added a custom PPIO that supports json format, but I think
other formats can be added if needed (for example XML).
The output is something like:
{
values:["a", "b", "c"],
size: 10,
featureTypeName: "Feature",
fieldName: "Field"
}
Regards,
Mauro Bartolomeoli
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