Andrea,
Thanks for helping the PR through.
I haven't tested out the first case completely. I've definitely run
into the issue that Alvaro is trying to address with WFS 2.0.
In the short term, is allowing the FC to delegate reasonable?
Cheers,
Jim
On 06/08/2018 12:07 PM, Andrea Aime wrote:
Ah,
that change was controversial and the pull request sat there for ages
before being merged:
https://github.com/geoserver/geoserver/pull/2664
(shows me as the author, but it's not really me, I'm just unwillingly
involved because nobody else would take action)
Please discuss.
Cheers
Andrea
On Fri, Jun 8, 2018 at 5:57 PM, Jim Hughes <jhug...@ccri.com
<mailto:jhug...@ccri.com>> wrote:
Hi all,
While testing out GeoMesa with GeoServer 2.13.x, we ran into some
issues with the FeatureSizeFeatureCollection. I think there are
two issues:
First, for a layers backed by a large volume of data, getCount
returning -1 is partially a way of saying that you don't want to
count all the features;). Given this pattern, I'd suggest that
the FeatureSizeFeatureCollection might be taken off the usual path
completely. It looks like it might be an optimization when
working with a bunch of little shapefiles.
Second, WPSes can be implemented with a visitor pattern. For
instance, the gs:Unique process leverages the GeoTools
UniqueVisitor(1) which is recognized by the JDBC DataStores. (In
GeoMesa, we do a bunch of similar things.)
The fact that the current FeatureSizeFeatureCollection doesn't
delegate prevents the UniqueProcess (and the GeoMesa ones) from
working properly...
In the short term, any objection to a PR which enables delegation
for that FeatureCollection?
Cheers,
Jim
1. UniqueVisitor:
https://github.com/geotools/geotools/blob/master/modules/library/main/src/main/java/org/geotools/feature/visitor/UniqueVisitor.java
<https://github.com/geotools/geotools/blob/master/modules/library/main/src/main/java/org/geotools/feature/visitor/UniqueVisitor.java>
https://github.com/geotools/geotools/blob/master/modules/library/jdbc/src/main/java/org/geotools/jdbc/SQLDialect.java#L375
<https://github.com/geotools/geotools/blob/master/modules/library/jdbc/src/main/java/org/geotools/jdbc/SQLDialect.java#L375>
p.s. I debugged this using PostGIS and the gs:Unique process.
When the FeatureSizeFC was 'on', the queries did not have the
'distinct' keyword. When the FC was off, GeoServer did make a
'distinct' query.
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