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OPTIONAL with empty default graph produces SPARQL compiler error #452
When executing the following query:
Virtuoso throws this error:
According to the SPARQL specification the default graph of the query's dataset is empty:
So my opinion is that the compiler is aware of this fact and therefore produces this error.
But, I see no reason why this should happen as this is a correct SPARQL query.
Tested with Virtuoso 7.2.1