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From "David Smiley (JIRA)" <>
Subject [jira] Commented: (LUCENE-2454) Nested Document query support
Date Mon, 14 Jun 2010 14:02:15 GMT


David Smiley commented on LUCENE-2454:

35.7MB of RAM for every filter is a LOT compared to the 357KB I need now (100x).  Presumably
the facet intersections now take 100x as long too.  I cache nearly a thousand of these per
index (lots of faceting!) which is by the way just one Solr shard of many.  No can do.  :-(

I wonder if its plausible to consider a different implementation strategy employing a parallel
index with the child documents storing the document IDs to the parent index.  I might even
assume I need no more than 1000 child documents and thus index blank documents as filler so
that if I am looking at a child document with id 32005 then it is the 6th sub-entity belonging
to parent document id 32.  I know that document IDs are a bit transient so I know that some
care would be needed to maintain this strategy.  Thoughts?

> Nested Document query support
> -----------------------------
>                 Key: LUCENE-2454
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>    Affects Versions: 3.0.2
>            Reporter: Mark Harwood
>            Assignee: Mark Harwood
>            Priority: Minor
>         Attachments:
> A facility for querying nested documents in a Lucene index as outlined in

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