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https://issues.apache.org/jira/browse/JENA-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16004817#comment-16004817
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ASF subversion and git services commented on JENA-1329:
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Commit b1ff0c1c382c1eef4e381e041c25846ddc970b7e in jena's branch
refs/heads/master from [~andy.seaborne]
[ https://git-wip-us.apache.org/repos/asf?p=jena.git;h=b1ff0c1 ]
JENA-1329: Define and use QueryIterator.isJoinIdentity.
Don't test for QueryIterRoot.
Don't use QueryIterRoot to hold a binding with set variables.
> 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
>
> {{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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