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https://issues.apache.org/jira/browse/JENA-973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600108#comment-14600108
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ASF subversion and git services commented on JENA-973:
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Commit a51455e2b0f416d100dd6444e1df88ad97fda257 in jena's branch
refs/heads/master from [~andy.seaborne]
[ https://git-wip-us.apache.org/repos/asf?p=jena.git;h=a51455e ]
JENA-973 : Implement different tests for syntax and algebra equality.
> Expression NOT EXISTS define equality by alegbra equivalence, not syntax
> equivalance.
> -------------------------------------------------------------------------------------
>
> Key: JENA-973
> URL: https://issues.apache.org/jira/browse/JENA-973
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: Jena 2.13.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Minor
>
> {{FILTER NOT EXISTS}} (and {{FILTER EXISTS}}) define their {{.equals}} by the
> equality of the algebra expression of the pattern part. This works except
> they are also syntax elements. There can be two different syntax ways to
> write what becomes the same algebra (but not the other way round).
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