[jira] [Commented] (JENA-1843) OpAsQuery: Wrong order of Extend/Bind

[Andy Seaborne (Jira)]

    [ 
https://issues.apache.org/jira/browse/JENA-1843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17058046#comment-17058046
 ] 

Andy Seaborne commented on JENA-1843:
-------------------------------------

Works for me: (current 3.15.0-SNAPSHOT being 3.15.0-20200311.1317)
{code:java}
    public static void main(String...a) {
        Query query = QueryFactory.create("SELECT (?s AS ?x) { ?s ?p ?o }");
        Op op = Algebra.compile(query);
        Query q = OpAsQuery.asQuery(op);
        System.out.println(op);
        System.out.println(q);
    }
{code}

What is the rest of the stack?

see also {{TestOpAsQuery.testSubQuery_05()}}

> 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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