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https://issues.apache.org/jira/browse/SOLR-1782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880964#action_12880964
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Wojtek Piaseczny edited comment on SOLR-1782 at 6/21/10 8:15 PM:
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First patch was unusably slow with ~1M documents. New patch uses both 
UninvertedField and FieldCache.DocTermsIndex for multi-valued facet fields in 
StatsComponent. getValues renamed to getTermNumbers to reflect the change.

      was (Author: wojtekpia):
    First batch was unusably slow with ~1M documents. New patch uses both 
UninvertedField and FieldCache.DocTermsIndex for multi-valued facet fields in 
StatsComponent. getValues renamed to getTermNumbers to reflect the change.
  
> stats.facet assumes FieldCache.StringIndex - fails horribly on multivalued 
> fields
> ---------------------------------------------------------------------------------
>
>                 Key: SOLR-1782
>                 URL: https://issues.apache.org/jira/browse/SOLR-1782
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 1.4
>         Environment: reproduced on Win2k3 using 1.5.0-dev solr ($Id: 
> CHANGES.txt 906924 2010-02-05 12:43:11Z noble $)
>            Reporter: Gerald DeConto
>         Attachments: index.rar, SOLR-1782.2.patch, SOLR-1782.patch, 
> SOLR-1782.test.patch
>
>
> the StatsComponent assumes any field specified in the stats.facet param can 
> be faceted using FieldCache.DEFAULT.getStringIndex.  This can cause problems 
> with a variety of field types, but in the case of multivalued fields it can 
> either cause erroneous false stats when the number of distinct values is 
> small, or it can cause ArrayIndexOutOfBoundsException when the number of 
> distinct values is greater then the number of documents.

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