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https://issues.apache.org/jira/browse/LUCENE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878317#action_12878317
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David Smiley commented on LUCENE-2454:
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Wow, this is absolutely awesome! This is one of the best enhancement requests
to Lucene/Solr that I've seen as it brings a real enhancement this is difficult
/ impossible to do without.
The leading concern I have with this implementation is the size of the number
of documents in the index as it affects the size of filters and perhaps other
areas involving creating BitSet's. I have a scenario in which the
sub-documents number on average over 100 to each primary document. These
sub-documents are at least very small, and they don't share any fields with the
parent. For a large scale search situation, an index containing 3M lucene
documents now needs to store over 300M, and thus require 100x the amount of RAM
for filter caches as I require now. Thoughts?
> Nested Document query support
> -----------------------------
>
> Key: LUCENE-2454
> URL: https://issues.apache.org/jira/browse/LUCENE-2454
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Affects Versions: 3.0.2
> Reporter: Mark Harwood
> Assignee: Mark Harwood
> Priority: Minor
> Attachments: LuceneNestedDocumentSupport-1.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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