Fix co-author map query for QLever compatibility#2781
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HakanIST wants to merge 1 commit intoWDscholia:mainfrom
Open
Fix co-author map query for QLever compatibility#2781HakanIST wants to merge 1 commit intoWDscholia:mainfrom
HakanIST wants to merge 1 commit intoWDscholia:mainfrom
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Fix the SPARQL query in author_coauthor-map.sparql that was returning no results on the QLever-backed Scholia instance. Two issues were identified and fixed: 1. FILTER (?author != target:) does not work correctly on QLever for IRI inequality comparison. Changed to use FILTER (STR(?author) != STR(target:)) which works on both QLever and Wikidata SPARQL (Blazegraph). 2. GROUP BY ?organization ?geo ?count included the aggregate variable ?count, which is invalid SPARQL. QLever is stricter about this than Blazegraph. Removed ?count from GROUP BY. Fixes WDscholia#2780
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Summary
Fix the SPARQL query in
author_coauthor-map.sparqlthat was returning no results on the QLever-backed Scholia instance.Fixes #2780
Changes
Two issues were identified and fixed:
1. IRI inequality filter incompatibility with QLever
FILTER (?author != target:)does not work correctly on QLever for IRI inequality comparison. QLever silently returns empty results instead of filtering properly.Fix: Changed to
FILTER (STR(?author) != STR(target:))which works correctly on both QLever and Wikidata SPARQL (Blazegraph).2. Invalid GROUP BY clause
GROUP BY ?organization ?geo ?countincluded the aggregate variable?count(defined asCOUNT(DISTINCT ?work)), which is technically invalid SPARQL. While Blazegraph tolerates this, QLever is stricter.Fix: Removed
?countfrom theGROUP BYclause, leavingGROUP BY ?organization ?geo.Testing