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https://issues.apache.org/jira/browse/SOLR-18307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18114612#comment-18114612
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ASF subversion and git services commented on SOLR-18307:
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Commit 2189c1ca3ddb39237ff0e74a6605038df0a7e586 in solr's branch
refs/heads/branch_10x from Mikhail Khludnev
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=2189c1ca3dd ]
SOLR-18307: aux index join qparser - a prunable segment-parallel auxi… (#4908)
backport of #4749
Co-authored-by: Copilot Autofix powered by AI
<[email protected]>
Co-authored-by: David Smiley <[email protected]>
> segment-parallel query time join with sidecar index
> ----------------------------------------------------
>
> Key: SOLR-18307
> URL: https://issues.apache.org/jira/browse/SOLR-18307
> Project: Solr
> Issue Type: Improvement
> Components: query
> Reporter: Mikhail Khludnev
> Assignee: Mikhail Khludnev
> Priority: Major
> Labels: pull-request-available
> Fix For: 10.1
>
> Attachments: Screenshot from 2026-08-29 18-14-22.png, hotspot.md
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Hereby I propose a new query-time join implementation
> * it's segment parallel
> * it's lazy - utilizes Two-Phase searching and beneficial from highly
> selective filter in "to"-side, as well as leap over whole "to" segments.
> * uses Lucene DocValues in sidecar - just an addition, there's no hard
> surgery on existing codebase. It's just a QParserPlugin.
> * joins crosscore, and works in cloud mode
> * may use Memory Directory for sidecar
> * writes sidecar lazily, but you can write it ahead
> * sweeps segments which are not needed anymore
> * the [simple benchmark|https://github.com/mkhludnev/aijoin-benchmark]
> demonstrates a few times gain
> WIP https://github.com/apache/solr/pull/4749
> benchmark: https://github.com/mkhludnev/aijoin-benchmark
> Caveat: during the demo 7/15/26 we evidence nearly the same size of sidecar
> index. it should be further investigated.
> Note: the name comes from Auxiliary Index Join.
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