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https://issues.apache.org/jira/browse/SOLR-7818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642279#comment-14642279
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Anshum Gupta commented on SOLR-7818:
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We should merge the terms from shard responses in a set and add that outside of
the loop rather than calling {{createNormalizedWeight}} and {{extractTerms}}.
This approach could potentially return only local terms, depending upon the
query parser.
Also having a test would be nice so we don't regress.
> Distributed stats only calculates with the terms that are present in the last
> shard of the distributed request
> --------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-7818
> URL: https://issues.apache.org/jira/browse/SOLR-7818
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.0, 5.1, 5.2, 5.2.1
> Reporter: Varun Thacker
> Assignee: Varun Thacker
> Fix For: 5.3
>
> Attachments: SOLR-7818.patch
>
>
> In ExactStatsCache#mergeToGlobalStats we go through the n responses and merge
> the termStats and colStats. But we keep putting the terms into the map which
> means only the last shard response terms will get used.
> This can lead to some terms not ending up calculating the distributed idf
> scores as the last shard might not have contained the term while the other
> shards actually had those terms.
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