Yev Bronshteyn created JENA-1254:
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Summary: Inconsistent and incorrect GROUP_CONCAT query execution
depending on order
Key: JENA-1254
URL: https://issues.apache.org/jira/browse/JENA-1254
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 3.1.0
Reporter: Yev Bronshteyn
The following two queries have the same triples in their {{where}} clauses in
different order. While it is expected that the first query will return only one
solution and the second query - multiple (per
https://wiki.blazegraph.com/wiki/index.php/SPARQL_Order_Matters), it is *not*
expected that the optional {{copyrightTexts}} value will appear in the result
of the first query, but not in the corresponding solution in the result of the
second query.
{code}
prefix spdx: <http://spdx.org/rdf/terms#>
prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix doap:<http://usefulinc.com/ns/doap#>
select
(group_concat(distinct(?licText);separator="\n\n") as ?licTexts)
(group_concat(?copyrightText;separator="\n\n") as ?copyrightTexts)
?name
where {
optional {
?elem spdx:copyrightText ?copyrightText .
filter (isLiteral(?copyrightText))
} .
{
# And the name
{?elem spdx:name ?name}
union
{
?elem spdx:artifactOf ?artifact .
?artifact doap:name ?name
}
}.
}
group by ?name
{code}
And
{code}
prefix spdx: <http://spdx.org/rdf/terms#>
prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix doap:<http://usefulinc.com/ns/doap#>
select
(group_concat(distinct(?licText);separator="\n\n") as ?licTexts)
(group_concat(?copyrightText;separator="\n\n") as ?copyrightTexts)
?name
where {
{
# And the name
{?elem spdx:name ?name}
union
{
?elem spdx:artifactOf ?artifact .
?artifact doap:name ?name
}
}.
optional {
?elem spdx:copyrightText ?copyrightText .
filter (isLiteral(?copyrightText))
} .
}
group by ?name
{code}
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