Mikhail Khludnev created SOLR-18307:
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Summary: 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
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 "two" 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
* simple benchmark demonstrates a few times gain
WIP https://github.com/mkhludnev/solr/tree/aijoin-qparser
Caveat: during the demo 7/15/26 we evidence nearly the same size of sidecar
index. it should be further investigated.
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