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https://issues.apache.org/jira/browse/LUCENE-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159006#comment-13159006
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Michael McCandless commented on LUCENE-3602:
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Awesome to finally bring JoinQuery to pure Lucene apps!
Can we cut back to normal ctor (not builder API) to create the
JoinQuery? One can always create a builder API layer on top if
necessary.
How does the preComputedFromDocs work? It's not per-segment? Like
it's a bitset across entire toplevel doc space?
Hmm we are also using MultiFields.getLiveDocs, which is quite slow to
use (must do binary search on each doc lookup).
I wonder if we can make this work per-segment... but that can be a 2nd
phase.
I think you can use seekExact instead of seekCeil? Better
performance...
What is the AdjustedDISI for (and when would Weight.scorer get a
top-level context...)?
> Add join query to Lucene
> ------------------------
>
> Key: LUCENE-3602
> URL: https://issues.apache.org/jira/browse/LUCENE-3602
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/join
> Reporter: Martijn van Groningen
> Attachments: LUCENE-3602.patch
>
>
> Solr has (psuedo) join query for a while now. I think this should also be
> available in Lucene.
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