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https://issues.apache.org/jira/browse/SOLR-3240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228463#comment-13228463
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James Dyer commented on SOLR-3240:
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Are you saying that if a user only cares that a collation will yield some hits,
but doesn't care how many, then we can short-circuit these queries to quit once
one document is collected? (alternatively, quit after n docs are collected is
the user doesn't care if it is "greater than n" ?)
> add spellcheck 'approximate collation count' mode
> -------------------------------------------------
>
> Key: SOLR-3240
> URL: https://issues.apache.org/jira/browse/SOLR-3240
> Project: Solr
> Issue Type: Improvement
> Components: spellchecker
> Reporter: Robert Muir
>
> SpellCheck's Collation in Solr is a way to ensure spellcheck/suggestions
> will actually net results (taking into account context like filtering).
> In order to do this (from my understanding), it generates candidate queries,
> executes them, and saves the total hit count: collation.setHits(hits).
> For a large index it seems this might be doing too much work: in particular
> I'm interested in ensuring this feature can work fast enough/well for
> autosuggesters.
> So I think we should offer an 'approximate' mode that uses an
> early-terminating
> Collector, collect()ing only N docs (e.g. n=1), and we approximate this result
> count based on docid space.
> I'm not sure what needs to happen on the solr side (possibly support for
> custom collectors?),
> but I think this could help and should possibly be the default.
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