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https://issues.apache.org/jira/browse/JENA-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814779#comment-13814779
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Andy Seaborne commented on JENA-106:
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rdf:langString|http://mail-archives.apache.org/mod_mbox/jena-dev/201310.mbox/%3C525A8428.1050207%40apache.org%3E]

> Merge joins in TDB
> ------------------
>
>                 Key: JENA-106
>                 URL: https://issues.apache.org/jira/browse/JENA-106
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: TDB
>            Reporter: Paolo Castagna
>              Labels: gsoc2013, mentor, performance, scalability, tdb
>
> "TDB indexes do return predictably ordered results from a index access. Merge 
> joins can be done and would be especially useful to apply to the first two 
> triple patterns (later ones depend on whether the result of the first two 
> come up in a useful order)." -- http://markmail.org/message/4gys5lidzbgwzxks
> OpExecutorTDB is the place to start looking into this (I think...).



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