Ben Caradoc-Davies created GEOS-5085:
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Summary: WFS 2.0 paging returns wrong features for startindex=0
Key: GEOS-5085
URL: https://jira.codehaus.org/browse/GEOS-5085
Project: GeoServer
Issue Type: Bug
Components: WFS
Affects Versions: 2.2.x
Environment: postgresql-9.1_9.1.3-2_i386.deb
GeoServer:
Version 2.2-SNAPSHOT
Subversion Revision 16812
Build Date 11-Mar-2012 19:23
GeoTools Version 8-SNAPSHOT (rev 38626)
Reporter: Ben Caradoc-Davies
Assignee: Justin Deoliveira
Priority: Critical
Looks like WFS 2.0 startindex=0 does not trigger the sorting used to implement
paging, causing the first page of results to be inconsistent with subsequent
pages, resulting in duplicate features in the data set.
I have some simple features (numberMatched="1354965") from a source postgis
table with an integer primary key starting at 1. If I ask for the first page
(startindex=0), I get some random features. If I ask for subsequent pages, they
appear as if the first count were the features with primary key 1..count.
For example, if I set count=1:
count=1&startindex=0
Response has: gml:id="lith_samples.808129"
count=1&startindex=1
Response has: gml:id="lith_samples.2"
count=1&startindex=2
Response has: gml:id="lith_samples.3"
and
count=1&startindex=808128
Response has: gml:id=""lith_samples.808129"
Duplicate feature!
I suspect that there is a logic error for startindex=0. How does the
implementation distinguish between startindex=0 and no startindex supplied?
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