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https://issues.apache.org/jira/browse/LUCENE-8544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662390#comment-16662390
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Michael Gibney commented on LUCENE-8544:
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I can't immediately speak to the possibility of adding this functionality to
the existing implementation of {{SpanNearQuery}}, but building on an
outstanding patch for LUCENE-7398, I think it might actually be pretty
straightforward.
The above-referenced patch makes {{NearSpansOrdered}} aware of indexed
{{PositionLengthAttribute}}. In a positionLength-aware context, it wasn't clear
to me how to port the {{NearSpansOrdered}} changes to {{NearSpansUnordered}};
there were a number of ways to interpret the task, all of which looked pretty
complicated and/or messy and/or difficult-verging-on-impossible to implement in
a performant way (and at a higher level, they all seemed a bit semantically
weird).
But positionLength-aware implementation of {{(Multi)PhraseQuery}} semantics in
the context of the above-referenced patch should be much simpler: given that
you have a fixed clause ordering, it just requires supporting negative offsets
in calculation of slop/edit distance.
> In SpanNearQuery, add support for inOrder semantics equivalent to that of
> (Multi)PhraseQuery
> --------------------------------------------------------------------------------------------
>
> Key: LUCENE-8544
> URL: https://issues.apache.org/jira/browse/LUCENE-8544
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Michael Gibney
> Priority: Minor
>
> As discussed in LUCENE-8531, the semantics of phrase search differs among
> {{(Multi)PhraseQuery}}, {{SpanNearQuery (inOrder=true)}}, and {{SpanNearQuery
> (inOrder=false)}}:
> * {{(Multi)PhraseQuery}}: incorporates the concept of order, and allows
> negative offsets in calculating slop/edit distance
> * {{SpanNearQuery (inOrder=true)}}: incorporates the concept of order, and
> does _not_ allow negative offsets in calculating slop/edit distance
> * {{SpanNearQuery (inOrder=false)}}: does not incorporate the concept of
> order at all
> This issue concerns the possibility of adjusting {{SpanNearQuery}} to be
> configurable to support semantics equivalent to that of
> {{(Multi)PhraseQuery}}.
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