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https://issues.apache.org/jira/browse/JENA-1843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17058115#comment-17058115
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Claus Stadler commented on JENA-1843:
-------------------------------------
My bad, it was an issue on my side:
First, I confused my test case results and I can confirm above query string
works in latest Jena.
Second, the actual issue was that I programmatically generated an OpExtend with
a VarExprList with a variable that mapped to a null expression. The would
roughly correspond to the invalid SPARQL syntax "BIND(UNDEF AS ?o)".
{code}
(project (?x ?o ?z)
(extend ((?x ?s) ?o (?z ?p)) <--- The issue was here
(table (vars ?s ?p ?o)
(row [?p <http://ex.org/p>] [?o <http://ex.org/o>] [?s <http://ex.org/s>])
)))
{code}
> OpAsQuery: Wrong order of Extend/Bind
> -------------------------------------
>
> Key: JENA-1843
> URL: https://issues.apache.org/jira/browse/JENA-1843
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.14.0
> Reporter: Claus Stadler
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.15.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> OpAsQuery breaks BINDs that depend on each other:
>
> {code:java}
> Query expected = QueryFactory.create("SELECT *
> { ?s ?p ?o BIND(?s AS ?x) BIND(?x AS ?y) }
> ");
> Query actual = OpAsQuery.asQuery(Algebra.compile(expected));
> System.out.println(expected);
> System.out.println(actual);
> {code}
> The two BIND statements incorrectly end up in reversed order - thus ?x is no
> longer bound in the result set:
> {code:java}
> expected: SELECT * WHERE { ?s ?p ?o BIND(?s AS ?x) BIND(?x AS ?y) }
> actual : SELECT * WHERE { ?s ?p ?o BIND(?x AS ?y) BIND(?s AS ?x) }
> {code}
>
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