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https://issues.apache.org/jira/browse/JENA-817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-817.
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Resolution: Fixed
> 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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