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https://issues.apache.org/jira/browse/LUCENE-7398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15673323#comment-15673323
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Michael McCandless commented on LUCENE-7398:
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[~paul.elsc...@xs4all.nl] I was able to apply the patch to current master
(there was one minor conflict) and tests passed.
I looked at the patch, and it looks like it generalizes the previous {{boolean
ordered}} into a trilean, adding a new {{ORDERED_LOOKEAHEAD}} option that
resolves some (not all) of the issues raised here, right? And the other two
options match the {{ordered=true}} and {{ordered=false}} cases today, so we
have back compat? So net/net, while this is a public API change, it is a step
forward ... progress not perfection.
I wonder if (separately!) we could explore adding minimal interval semantics to
Lucene, like MG4J:
http://vigna.di.unimi.it/ftp/papers/EfficientAlgorithmsMinimalIntervalSemantics.pdf
... I don't know much about it, but it sounds compelling and efficient :)
> 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-7398-20160924.patch,
> LUCENE-7398-20160925.patch, LUCENE-7398.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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