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https://issues.apache.org/jira/browse/LUCENE-8045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245455#comment-16245455
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Alan Woodward commented on LUCENE-8045:
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Looking further, I think the FieldInfos.Builder behaviour is correct, as it's
used by SegmentMerger and ReadersAndUpdates, where deletes and DV updates are
flattened out. So this is really a bug in ParallelReader.
> FieldInfos.Builder.add(FieldInfo) does not copy across dvGen
> ------------------------------------------------------------
>
> Key: LUCENE-8045
> URL: https://issues.apache.org/jira/browse/LUCENE-8045
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Alan Woodward
> Assignee: Alan Woodward
>
> Exposed by this test failure:
> https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/777/testReport/junit/org.apache.lucene.search/TestLRUQueryCache/testDocValuesUpdatesDontBreakCache/
> A reader is randomly wrapped with a ParallelLeafReader, which does not then
> correctly propagate the dvGen into its own FieldInfo.
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