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https://issues.apache.org/jira/browse/LUCENE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038460#comment-13038460
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Mark Harwood commented on LUCENE-2454:
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Thanks for the patch work, Mike. I'll need to check LUCENE-3129 for equivalence
with PerParentLimitQuery. It's certainly a central part of what I typically
deploy for nested queries - pass 1 is usually a NestedDocumentQuery to get the
best parents and pass 2 uses PerParentLimitQuery to get the best children for
these best parents. Of course some apps can simply fetch ALL children for the
top parents but in some cases summarising children is required (note: this is
potentially a great solution for performance issues on highlighting big docs
e.g. entire books).
I haven't benchmarked nextSetBit vs the existing "rewind" implementation but I
imagine it may be quicker. Parent- followed-by-children seems more natural from
a user's point of view however. I guess you could always keep the
parent-then-child insertion order but flip the bitset (then cache) for query
execution if that was faster. Benchmarking rewind vs nextSetbit vs flip then
nextSetBit would reveal all.
Thomas - maintaining a strict order of parent/child docs is important and the
recently-committed LUCENE-3112 should help with this.
> Nested Document query support
> -----------------------------
>
> Key: LUCENE-2454
> URL: https://issues.apache.org/jira/browse/LUCENE-2454
> Project: Lucene - Java
> Issue Type: New Feature
> Components: core/search
> Affects Versions: 3.0.2
> Reporter: Mark Harwood
> Assignee: Mark Harwood
> Priority: Minor
> Attachments: LUCENE-2454.patch, LuceneNestedDocumentSupport.zip
>
>
> A facility for querying nested documents in a Lucene index as outlined in
> http://www.slideshare.net/MarkHarwood/proposal-for-nested-document-support-in-lucene
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