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From the definition of GroupConcat I would assume that the inputs of the function are converted to strings and the output is the concatenation of the strings to one string.
For example for the following query
I would assume the result
"a.b.c"
(order of strings not important) as stated by the definition. The wikidata wndpoint does return this result but QLever returns"a"."b"."c"
.If a language tag is added e.g.
@en
the QLever result becomes"a"@en."b"@en."c"@en
whereas the wikidata endpoint returnsa.b.c
Since GROUP_CONCAT is specified as string concatenation I would expect that the quotes of a single value are not included in the concat result so that the concatenation result only contains the values separated by the defined separator.
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