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https://issues.apache.org/jira/browse/LUCENE-7398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15465336#comment-15465336
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Christoph Goller commented on LUCENE-7398:
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Good idea to try the nested tests from TestSpanCollection for the unordered 
case. The example from LUCENE-5331 shows the problems of incomplete 
backtracking (not comparing all combinations of span matches of all subspans) 
for the unordered case. In the ordered case we only have a problem with spans 
that have matches of different lenght, in the unorderd case we also see a 
problem with overlapping span-matches, even if they all have length 1.

> Nested Span Queries are buggy
> -----------------------------
>
>                 Key: LUCENE-7398
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7398
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/search
>    Affects Versions: 5.5, 6.x
>            Reporter: Christoph Goller
>            Assignee: Alan Woodward
>            Priority: Critical
>         Attachments: LUCENE-7398-20160814.patch, LUCENE-7398.patch, 
> LUCENE-7398.patch, TestSpanCollection.java
>
>
> Example for a nested SpanQuery that is not working:
> Document: Human Genome Organization , HUGO , is trying to coordinate gene 
> mapping research worldwide.
> Query: spanNear([body:coordinate, spanOr([spanNear([body:gene, body:mapping], 
> 0, true), body:gene]), body:research], 0, true)
> The query should match "coordinate gene mapping research" as well as 
> "coordinate gene research". It does not match  "coordinate gene mapping 
> research" with Lucene 5.5 or 6.1, it did however match with Lucene 4.10.4. It 
> probably stopped working with the changes on SpanQueries in 5.3. I will 
> attach a unit test that shows the problem.



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