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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2014/11/24 12:22:12 UTC

[jira] [Created] (JENA-817) SUM(?a) {empty} is error but SUM( DISTINCT?a) {empty} is value zero.

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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