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https://issues.apache.org/jira/browse/SOLR-10836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-10836.
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Resolution: Fixed
> TextLogisticRegression parser (and others) assume non-empty index.
> ------------------------------------------------------------------
>
> Key: SOLR-10836
> URL: https://issues.apache.org/jira/browse/SOLR-10836
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: master (7.0), 6.7
>
> Attachments: SOLR-10836.patch,
> SOLR_10836_use_SolrIndexSearcher_cached_MultiFields_instead_of_recreating.patch
>
>
> TextLogisticRegressionQParserPlugin, IGainTermsQParserPlugin and
> SignificantTermsQParserPlugin are similarly affected:
> finish() contains this line of code:
> {code:java}
> Terms terms =
> MultiFields.getFields(searcher.getIndexReader()).terms(trainingParams.feature);
> {code}
> Instead I think it should be this:
> {code:java}
> Terms terms =
> ((SolrIndexSearcher)searcher).getSlowAtomicReader().terms(trainingParams.feature);
> {code}
> MultiFields can take some time to build and Solr (via SlowAtomicReader) has
> already done this work.
> In addition, the code assumes Terms is non-null when in fact it will be null
> if there's no data.
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