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https://issues.apache.org/jira/browse/LUCENE-7398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404699#comment-15404699
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Paul Elschot commented on LUCENE-7398:
--------------------------------------
The patch changes the order in SpanPositionQueue which is used by SpanOr.
This works to pass the test case, and it does not increase complexity.
I think the problem is in NearSpansOrdered.stretchToOrder() which only does
this:
{code}matchEnd = subSpans[subSpans.length - 1].endPosition();{code}
What is should also do is lookahead to see whether there is an ordered match
with a smaller slop.
It could be that there still is a failing case with a nested SpanOr, possibly
over containing another nested SpanNear, but I'm not sure, this is tricky.
Since looking ahead increases the complexity (normal case runtime) I'd prefer
to have the patch applied now, and see what the future brings.
> 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.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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