Grouping by a COUNT() not supported

[niklas88]

From a Wikidata query example subquery:

PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX schema: <http://schema.org/>
SELECT DISTINCT ?path (COUNT(?pwPart) AS ?genes) WHERE {
   ?path wdt:P2410 ?WikipathsID .
   ?path wdt:P527 ?pwPart .
   ?pwPart wdt:P31 wd:Q7187 .
}
GROUP BY ?path ?genes

And on Scientists:

SELECT DISTINCT ?sc (COUNT(?partner) as ?partners) WHERE {
   ?sc <is-a> <Scientist> .
   ?sc <Spouse_(or_domestic_partner)> ?partner .
}
GROUP BY ?sc ?partners

The last log message before the crash is the following warning

WARN:  Group by variable ?partners is not part of the query.

[niklas88]

So thinking about this, it's a bit weird as the COUNT() is counted over the groups. In Blazegraph it looks like GROUP BY ?path ?genes in the example above is exactly the same as GROUP BY ?path. Also these results contain the same count twice so definitely don't group by it.

[hannahbast]

That is not a valid SPARQL query and QLever now indeed returns an error message saying that.