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From "Stephen Allen (JIRA)" <>
Subject [jira] [Created] (JENA-120) Query objects with aggregators cannot be reused
Date Tue, 20 Sep 2011 15:54:08 GMT
Query objects with aggregators cannot be reused

                 Key: JENA-120
             Project: Jena
          Issue Type: Bug
          Components: ARQ
            Reporter: Stephen Allen
            Priority: Minor
         Attachments: JENA-120-r1173178.patch

Query objects that contain aggregators (Group By) cannot be reused by different threads because
the internal state is mutable.  Even reusing a query object in the same thread has problems,
because it creates a new Aggregator object each time you execute the query.  Users may want
to reuse Query objects to save having to reparse the query string.

I believe the solution is to copy the aggregators when compiling the query.  I've attached
a patch that does that in the AlgebraGenerator.compileModifiers() method.

See the thread at [1] for more discussion.


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