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https://issues.apache.org/jira/browse/JENA-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295198#comment-15295198
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ASF GitHub Bot commented on JENA-1171:
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Github user asfgit closed the pull request at:
https://github.com/apache/jena/pull/145
> Rework algebra/expression walk and transformation framework
> -----------------------------------------------------------
>
> Key: JENA-1171
> URL: https://issues.apache.org/jira/browse/JENA-1171
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 3.1.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
>
> The current framework walks algebra operations but relies on each visitor or
> transformer to handle expressions inside ops (e.g. filter, leftjoin, extend)
> but also ops inside expressions (exists). These can be arbitrary nested.
> This reliance on carefully written code leads to incomplete and error prone
> transformations.
> https://github.com/afs/jena/tree/walker is a rewriting of op and expressions
> walking and transforming to walk/transform recursively as part of the
> machinery.
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