On 5/3/21 7:01 PM, Andy Seaborne wrote:
https://issues.apache.org/jira/browse/JENA-1963
Try
sparql --strict
sparql --engine=ref
sparql --optimize=off
The optimization rule that sees "FILTER(?n = ?m)" and tries to make it a
join goes wrong because of the interaction with substitution.
yes, this solves the issue
BTW:
https://afs.github.io/substitute.html
lists several problems with NOT EXISTS and gives a solution.
The solution would also work for parameterized queries if the
scope-renaming is omitted.
ah, thank you for the pointer!
olivier
