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https://issues.apache.org/jira/browse/SOLR-7818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Varun Thacker updated SOLR-7818:
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Attachment: SOLR-7818.patch
Thanks Anshum for your feedback.
Yeah the earlier method wouldn't have worked for query parsers like
MLTQueryParser etc.
Regarding a test case I've added
{{TestDistributedIDF#testMultiCollectionQuery}} . This test exposes this
problem.
> 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, 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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