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https://issues.apache.org/jira/browse/LUCENE-5222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770799#comment-13770799
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Robert Muir commented on LUCENE-5222:
-------------------------------------

Its not returning NaN, when you say 'doDocScores', indexsearcher confusingly 
fills a NaN.

I think we have way too many booleans, optimizations, and specializations 
here... 

I dont think anyone tests this paging with multiple sorts... ill commit 
something to TestSearchAfter to try to break these collectors.
                
> TestExpressionSorts fails sometimes when using expression returning score
> -------------------------------------------------------------------------
>
>                 Key: LUCENE-5222
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5222
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Ryan Ernst
>
> Jenkins picked this up.  Repeat with:
> {code}
> ant test  -Dtestcase=TestExpressionSorts -Dtests.method=testQueries 
> -Dtests.seed=115AD00ED89D9F7B -Dtests.multiplier=3 -Dtests.slow=true 
> -Dtests.locale=no_NO -Dtests.timezone=America/Nassau 
> -Dtests.file.encoding=US-ASCII
> {code}
> It appears to have to do with scoring, as removing the score sort from the 
> original sorts causes the tests to pass.  If you remove the possible 
> discrepancy between doDocScores and docMaxScore params to searcher.search, 
> then the test gets farther before failing.

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