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https://issues.apache.org/jira/browse/LUCENE-3129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-3129:
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Attachment: LUCENE-3129.patch
Patch.
I ran quick perf test -- single pass was ~18% faster than two-pass (using
cache). Not as much as I expected... but every bit counts!
> Single-pass grouping collector based on doc blocks
> --------------------------------------------------
>
> Key: LUCENE-3129
> URL: https://issues.apache.org/jira/browse/LUCENE-3129
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/grouping
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-3129.patch
>
>
> LUCENE-3112 enables adding/updating a contiguous block of documents to
> the index, guaranteed (yet, experimental!) to retain adjacent docID
> assignment through the full life of the index as long the app doesn't
> delete individual docs from the block.
> When an app does this, it can enable neat features like LUCENE-2454
> (nested documents), post-group facet counting (LUCENE-3097).
> It also makes single-pass grouping possible, when you group by
> the "identifier" field shared by the doc block, since we know we will
> see a given group only once with all of its docs within one block.
> This should be faster than the fully general two-pass collectors we
> already have.
> I'm working on a patch but not quite there yet...
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