[jira] [Assigned] (SOLR-3240) add spellcheck 'approximate collation count' mode

["James Dyer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-3240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Dyer reassigned SOLR-3240:
--------------------------------

    Assignee: James Dyer
    
> 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
>            Assignee: James Dyer
>         Attachments: SOLR-3240.patch, SOLR-3240.patch, SOLR-3240.patch
>
>
> 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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