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https://issues.apache.org/jira/browse/SOLR-1782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877865#action_12877865
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Wojtek Piaseczny commented on SOLR-1782:
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I'd like to contribute to solving this issue, but I'm not sure if I'm going
down the right path. Here are the possible solutions I see:
1. Use UninvertedField for multi-valued facets in the StatsComponent. This
would require a new method in UninvertedField: something like getValues(int
docID). The problem with this is the big terms collection in UninvertedField...
getting all values for a single document via big terms is expensive (have to
iterate entire collection).
2. Get facet values for the result set in the StatsComponent, then iterate
through each value and get a new document set for each value, then iterate
through each document in this new set and calculate stats. Sounds expensive.
Are there better options?
> 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.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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