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https://issues.apache.org/jira/browse/LUCENE-7591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved LUCENE-7591.
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Resolution: Fixed
> Let DatasetSplitter approximate no. of class values by no. of terms
> -------------------------------------------------------------------
>
> Key: LUCENE-7591
> URL: https://issues.apache.org/jira/browse/LUCENE-7591
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/classification
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Fix For: master (7.0)
>
>
> Currently {{DatasetSplitter}} throws an exception if it's not possible to
> find {{SortedDocValues}} or {{SortedSetDocValues}} on the class field as it
> wouldn't be possible to correctly split the indexes in a balanced way.
> As a fallback we could instead use the no. of terms per leaf reader as an
> approximate count (upper bound) to the no. of classes.
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