Claus Stadler created JENA-1843:
-----------------------------------

             Summary: 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


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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