Eetu Mäkelä created JENA-809:
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Summary: TransformExtendCombine breaks BINDs inside SERVICE
Key: JENA-809
URL: https://issues.apache.org/jira/browse/JENA-809
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.12.1
Reporter: Eetu Mäkelä
Optimization breaks BIND expressions in some situations since
TransformExtendCombine was enabled in commit
4e5fe9a20d1531430ab96cb2ab9694aed9a9538b (culprit found using git bisect). I
don't know exactly when or why this happens, but I hit upon this while using
SERVICE. I've been able to create the following minimal example.
For the query:
{code}
SELECT * {
SERVICE <> {
BIND(1 AS ?foo)
BIND(2 AS ?bar)
}
}
{code}
qparse --explain for 2.12.0 returns:
{code}
(service <file:///home/jiemakel/qf>
(extend ((?foo 1) (?bar 2))
(table unit)))
{code}
which works fine, while for 2.12.1 it returns:
{code}
(service <file:///home/jiemakel/qf>
(extend ((?bar 2))
(extend ((?foo 1) (?bar 2))
(table unit))))
{code}
which binds ?bar twice, and fails with {{BIND: Variable used when already
in-scope: ?bar in BIND(2 AS ?bar)}}
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