Eetu Mäkelä created JENA-1187:
---------------------------------
Summary: Wrong results/performance regression when using BIND and
graph pattern groups
Key: JENA-1187
URL: https://issues.apache.org/jira/browse/JENA-1187
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Fuseki 2.4.0, Jena 3.1.0
Reporter: Eetu Mäkelä
I've been using SPARQL queries with BINDs and/or VALUESs that precede UNION
blocks. These used to work efficiently (at least in Jena 2 times) with the
bound value being bound also in the subpattern, but no longer do. In addition,
at certain times, they produce nonsensical results. For example, the below
returns {{rdf:type}} statements in the dataset without any regard to ?cl:
{code}
SELECT * {
{
BIND("nonexistant" AS ?cl)
{
BIND(?cl AS ?cl2)
?c a ?cl2 .
} UNION {
BIND(?cl AS ?cl2)
?c a ?cl2 .
}
}
}
LIMIT 10
{code}
while if you change _just one_ of the subpatterns in the union to directly
refer to ?cl, it returns an empty result set:
{code}
SELECT * {
{
BIND("nonexistant" AS ?cl)
{
BIND(?cl AS ?cl2)
?c a ?cl .
} UNION {
BIND(?cl AS ?cl2)
?c a ?cl2 .
}
}
}
LIMIT 10
{code}
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