[
https://issues.apache.org/jira/browse/JENA-1945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Claus Stadler updated JENA-1945:
--------------------------------
Description:
{code:java}
System.out.println(
Algebra.unionDefaultGraph(
Algebra.compile(
QueryFactory.create("SELECT * { ?s <urn:p> ?o }"))));
/* Yields correct result:
(distinct
(graph ??_
(bgp (triple ?s <urn:p> ?o))))
*/
System.out.println(
Algebra.unionDefaultGraph(
Algebra.compile(
QueryFactory.create("SELECT * { ?s <urn:p1>/<urn:p2>/<urn:p3> ?o }"))));
/* Yields incorrect result because wrapping with graph ??_ (and distinct) is
missing:
(path ?s (seq (seq <urn:p1> <urn:p2>) <urn:p3>) ?o)
*/
{code}
It seems
[TransformUnionQuery.java|https://github.com/apache/jena/blob/master/jena-arq/src/main/java/org/apache/jena/sparql/algebra/TransformUnionQuery.java#L34]
lacks the handling of (at least) OpPath
was:
{code:java}
System.out.println(
Algebra.unionDefaultGraph(
Algebra.compile(
QueryFactory.create("SELECT * { ?s <urn:p> ?o }"))));
/* Yields correct result:
(distinct
(graph ??_
(bgp (triple ?s <urn:p> ?o))))
*/
System.out.println(
Algebra.unionDefaultGraph(
Algebra.compile(
QueryFactory.create("SELECT * { ?s <urn:p1>/<urn:p2>/<urn:p3> ?o }"))));
/* Yields incorrect result because wrapping with graph ??_ (and distinct) is
missing:
(path ?s (seq (seq <urn:p1> <urn:p2>) <urn:p3>) ?o)
*/
{code}
It seems
[TransformUnionQuery.java|https://github.com/apache/jena/blob/master/jena-arq/src/main/java/org/apache/jena/sparql/algebra/TransformUnionQuery.java#L34]
lacks the handling of (at least) for OpPath
> Algebra.unionDefaultGraph: OpPath not handled
> ---------------------------------------------
>
> Key: JENA-1945
> URL: https://issues.apache.org/jira/browse/JENA-1945
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: Jena 3.16.0
> Reporter: Claus Stadler
> Priority: Major
>
>
> {code:java}
> System.out.println(
> Algebra.unionDefaultGraph(
> Algebra.compile(
> QueryFactory.create("SELECT * { ?s <urn:p> ?o }"))));
> /* Yields correct result:
> (distinct
> (graph ??_
> (bgp (triple ?s <urn:p> ?o))))
> */
> System.out.println(
> Algebra.unionDefaultGraph(
> Algebra.compile(
> QueryFactory.create("SELECT * { ?s <urn:p1>/<urn:p2>/<urn:p3> ?o }"))));
> /* Yields incorrect result because wrapping with graph ??_ (and distinct) is
> missing:
> (path ?s (seq (seq <urn:p1> <urn:p2>) <urn:p3>) ?o)
> */
> {code}
>
> It seems
> [TransformUnionQuery.java|https://github.com/apache/jena/blob/master/jena-arq/src/main/java/org/apache/jena/sparql/algebra/TransformUnionQuery.java#L34]
> lacks the handling of (at least) OpPath
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