Using the group_concat function with the separator indicating an empty string ("") leads incorrectly to the default use of a space character as separator (" ").
Example code:
PREFIX : <http://example.org/>
SELECT ?subject (GROUP_CONCAT(?object; separator="") AS ?concatenatedObjects)
WHERE {
VALUES (?subject ?object) {
(:subject1 "a")
(:subject1 "b")
(:subject1 "c")
}
}
GROUP BY ?subject
Expected outcome for concatenatedObjects:
abc
Instead we get:
a b c
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