[jboss-jira] [JBoss JIRA] (DROOLS-414) Queries do not work with chained accessors as arguments

[Mario Fusco (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12938249#comment-12938249 ] 

Mario Fusco commented on DROOLS-414:
------------------------------------

For what regards queries documentation clearly states that

The following is not yet supported:
    List and Map unification
    Variables for the fields of facts
    Expression unification - pred( X, X + 1, X * Y / 7 )

For this reason I changed this ticket from bug to feature request. Moreover I developed a test case reproducing this issue.

{source}
    @Test
    public void testQueryWithAccessorAsArgument() throws Exception {
        String str =
                "import org.drools.compiler.Person\n" +
                "global java.util.List persons;\n" +
                "\n" +
                "query contains(String $s, String $c)\n" +
                "    $s := String( this.contains( $c ) )\n" +
                "end\n" +
                "\n" +
                "rule R when\n" +
                "    $p : Person()\n" +
                "    contains( $p.name, \"a\"; )\n" +
                "then\n" +
                "    persons.add( $p );\n" +
                "end\n";

        KnowledgeBase kbase = loadKnowledgeBaseFromString(str);
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

        List<Person> personsWithA = new ArrayList<Person>();
        ksession.setGlobal("persons", personsWithA);

        ksession.insert("Mark");
        ksession.insert("Edson");
        ksession.insert("Mario");
        ksession.insert(new Person("Mark"));
        ksession.insert(new Person("Edson"));
        ksession.insert(new Person("Mario"));
        ksession.fireAllRules();

        assertEquals(2, personsWithA.size());
    }
{source}
                
> Queries do not work with chained accessors as arguments
> -------------------------------------------------------
>
>                 Key: DROOLS-414
>                 URL: https://issues.jboss.org/browse/DROOLS-414
>             Project: Drools
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.0.Final, 6.0.1.Final
>            Reporter: Davide Sottara
>            Assignee: Mario Fusco
>
> When processing a query CE that uses chained property accessors:
> when
>   $x : Foo()
>   myQuery( $x.bar ; ) 
> then
> the QueryElementBuilder considers the whole expression $x.bar as a variable. Since no variable with that name has been bound, it is taken to be a new declaration, and thus an output. This results in an inconsistent behavior, since an obvious constraint will be ignored.

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