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https://issues.apache.org/jira/browse/LUCENE-7649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15832376#comment-15832376
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Hoss Man commented on LUCENE-7649:
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not sure if it matters, but i only ever saw the new
{{TestDocValuesQueries.testSortedNumericNPE}} added by SOLR-10013 fail on
branch_6x -- i never saw a failure on master.
that may be because diff in RandomizedIndexWriter between the branches just has
a side effect of making this bug happen less frequently, or it may indicate
some other subtle bug in the DV code path between the two branches.
> investigate re-adding unwrapSingleton optimization attempted by LUCENE-7643
> ---------------------------------------------------------------------------
>
> Key: LUCENE-7649
> URL: https://issues.apache.org/jira/browse/LUCENE-7649
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Hoss Man
> Assignee: Adrien Grand
>
> as part of some refactoring done in LUCENE-7643, an optimization for was
> introduced for some single valued cases, which introduced an NPE risk
> surfaced in SOLR-10013.
> I plan to fix SOLR-10013 by disabling this optimization with a comment
> pointing to this issue, and commit with it a lucene level test steve wrote
> that _usualy_ fails with the optimized code (since it doesn't fail 100% of
> the time, it suggests the failure is related to the RandomizedIndexWriter -
> the docs and queries are fixed)
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