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https://issues.apache.org/jira/browse/LUCENE-7068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Elschot updated LUCENE-7068:
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    Attachment: LUCENE-7068.patch

Patch of 9 March 2016.
Reworked the join implementation, and added another test.

This inner join implementation has a time complexity that is linear in the 
total input size.
The memory use can be limited by giving the largest input TopDocs last.

> Retrieve ranks
> --------------
>
>                 Key: LUCENE-7068
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7068
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/other
>            Reporter: Paul Elschot
>            Priority: Minor
>         Attachments: LUCENE-7068.patch, LUCENE-7068.patch, LUCENE-7068.patch
>
>
> Join TopDocs by docs, keep the result ranks.



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