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https://issues.apache.org/jira/browse/SOLR-4876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670077#comment-13670077
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Uwe Schindler commented on SOLR-4876:
-------------------------------------
This is not a bug in ReaderContext. If a composite reader has no fields it is
perfectly fine to return null. The bug is somewhere else in Solr. It must be
listed in the reader context, as it may contain documents.
> Only reader that contains fields can be added into readerContext
> ----------------------------------------------------------------
>
> Key: SOLR-4876
> URL: https://issues.apache.org/jira/browse/SOLR-4876
> Project: Solr
> Issue Type: Bug
> Components: Build
> Affects Versions: 4.2
> Reporter: Bao Yang Yang
> Priority: Critical
> Labels: patch
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When there is only Segements in solr core, which means no any indexes, in
> CompositeReaderContext.build() method, the atomicReader that has no fields
> returned should not be added into leaves. Otherwise, in
> SolrIndexSearcher.getDocSetNC(Query query, DocSet filter), when execute line
> fields.terms(t.field()), a nullpointerexception will occur since fields
> variable is null.
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