Joshua Taylor created JENA-1203:
-----------------------------------
Summary: projecting non grouped variable in subquery is
incorrectly allowed
Key: JENA-1203
URL: https://issues.apache.org/jira/browse/JENA-1203
Project: Apache Jena
Issue Type: Bug
Environment: sparql.org's validator
Reporter: Joshua Taylor
Priority: Minor
Described in this Stack Overflow answer,
http://stackoverflow.com/a/38104783/1281433 :
{code}
SELECT ?sub ?pred ?obj (count(?obj) as ?count)
WHERE { ?sub ?pred ?obj .
} GROUP BY ?sub
{code}
is illegal, because there are non-grouped variables in the projection (?pred,
?obj). However, when this query appears as a subquery, no syntax error is
reported, as in:
{code}
DELETE { ?sub ?pred ?obj . }
WHERE {
{SELECT ?sub ?pred ?obj (count(?obj) as ?count)
WHERE { ?sub ?pred ?obj .
} GROUP BY ?sub
} FILTER(?count < 14)
}
{code}
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