[jira] [Resolved] (JENA-1329) QueryIterRoot should not be overloaded for initial bindings.

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne resolved JENA-1329.
---------------------------------
       Resolution: Fixed
    Fix Version/s: Jena 3.4.0

> QueryIterRoot should not be overloaded for initial bindings.
> ------------------------------------------------------------
>
>                 Key: JENA-1329
>                 URL: https://issues.apache.org/jira/browse/JENA-1329
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ
>    Affects Versions: Jena 3.2.0, Jena 3.3.0
>            Reporter: Andy Seaborne
>            Assignee: Andy Seaborne
>             Fix For: Jena 3.4.0
>
>
> {{QueryIterRoot}} is also used for initial bindings but the code sometimes assumes that the root binding is the join identity iterator (one row, no columns).
> {{QueryIterRoot}} should be reserved for for this case.
> {{QueryIterator}} could have a method {{.isJoinIdentity()}} so that an iterator can be tested without peeking and without assuming the java class.



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