Federated aggregates get tripped up by zero hits from one source
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GoogleCodeExporter commented
If you try a query like:
select ?s (count(?o) as ?c) { ?s <prop> ?o } group by ?s
Over two sources where, in one, prop doesn't appear you get a result like:
< a, 2 > < b, 1 > < NULL, 0 >
due to one having no hits and hence grouping incorrectly.
Original issue reported on code.google.com by pl...@mac.com
on 18 Mar 2011 at 1:06