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https://issues.apache.org/jira/browse/JENA-120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne updated JENA-120:
-------------------------------
Attachment: JENA-120-r1173738.patch
Bug fixed. QueryIterGroup rewritten.
BindingKey removed (heritage from an old, old design).
The patch attached records the new stuff when the old mechanisms were also in
place.
Changes to Aggregators (removing their statefulness) will now be done.
> Query objects with aggregators cannot be reused
> -----------------------------------------------
>
> Key: JENA-120
> URL: https://issues.apache.org/jira/browse/JENA-120
> Project: Jena
> Issue Type: Bug
> Components: ARQ
> Reporter: Stephen Allen
> Assignee: Andy Seaborne
> Priority: Minor
> Attachments: JENA-120-r1173178.patch, JENA-120-r1173729.patch,
> JENA-120-r1173738.patch, JENA-120-r1173738.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.
> [1]
> http://mail-archives.apache.org/mod_mbox/incubator-jena-users/201109.mbox/%3cb60aca3a-db31-4fec-a72e-d81a5c2ab...@knublauch.com%3E
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