Andy Seaborne created JENA-817:
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Summary: SUM(?a) {empty} is error but SUM( DISTINCT?a) {empty} is
value zero.
Key: JENA-817
URL: https://issues.apache.org/jira/browse/JENA-817
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.12.1
Reporter: Andy Seaborne
Assignee: Andy Seaborne
Fix For: Jena 2.12.2
They can't both be right!
The fix is to make sum(empty) zero. Looks like the code use to do that but was
left is a debugging state.
In SQL, sum(empty) is NULL.
In SPARQL 1.1, sec 18.5.1.3:
Sum(S) = "0"^^xsd:integer when card[S] = 0
so it is zero.
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