Hannah_Bast added a comment.
> Oh, ok. Could you give an example of a query that has no "highly selective
triples" so I can test it on QLever vs. BG?
Here is a relatively simple query without a highly selective triple. It asks
for the 100 people with the most professions. It requires a JOIN of the first
triple (around 9 million people) with the second triple (all people and their
professions, around 8.5 million triples). And there is no easy around computing
the full join result because we want the people with the most professions in
the end and you cannot know in advance which people these are. The query
deliberately does not have a large query result. So if it takes long, it's not
because the output is so large.
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?person ?name (COUNT(?profession) AS ?count) WHERE {
?person wdt:P31 wd:Q5 .
?person wdt:P106 ?profession .
?person rdfs:label ?name .
FILTER (LANG(?name) = "en")
}
GROUP BY ?person ?name
ORDER BY DESC(?count)
LIMIT 100
TASK DETAIL
https://phabricator.wikimedia.org/T291903
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