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https://issues.apache.org/jira/browse/SOLR-7190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907832#comment-14907832
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Mikhail Khludnev commented on SOLR-7190:
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bq. According to Shalin comment, what will happen now if a request has the
facet.method=fc and we don't have docValues for the field of interest for
faceting calculations ?
{{UninvertingReader}} builds docValues-*like* data structure in heap
> Remove unused UninvertedField
> -----------------------------
>
> Key: SOLR-7190
> URL: https://issues.apache.org/jira/browse/SOLR-7190
> Project: Solr
> Issue Type: Task
> Reporter: Shalin Shekhar Mangar
> Priority: Minor
> Fix For: 5.2, Trunk
>
>
> I was surprised to find that UninvertedField is no longer used in Solr. The
> only references to UninvertedField is from the fieldValueCache inside
> SolrIndexSearcher and that itself is not used anywhere in SolrIndexSearcher
> except for initialization and regeneration. I can't trace when Solr stopped
> using this class but in any case, we should remove it.
> In a related note, Lucene's DocTermOrds has a copy of the class level
> javadocs of UninvertedField (which extends DocTermOrds). This was done in in
> LUCENE-5666.
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