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https://issues.apache.org/jira/browse/LUCENE-6871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14986069#comment-14986069
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Alan Woodward commented on LUCENE-6871:
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The idea is that SpanQueries become just like normal queries, but that they can
return a special type of Scorer (the Spans) in addition to their normal Scorer,
allowing them to be nested. Maybe it would be a bit clearer if I put up a
patch with the changes to TermQuery?
I can see the concern with Boosting, but that's dealt with at the moment by
requiring that SpanNear must take at least two child queries. Although it
would be nice to enforce this via the compiler rather than at runtime.
> Move SpanQueries out of .spans package
> --------------------------------------
>
> Key: LUCENE-6871
> URL: https://issues.apache.org/jira/browse/LUCENE-6871
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: Trunk, 5.4
> Reporter: Alan Woodward
> Attachments: LUCENE-6871.patch
>
>
> SpanQueries are now essentially the same as a standard query, restricted to a
> single field and with an extra scorer type returned by getSpans(). There are
> a number of existing queries that fit this contract, including TermQuery and
> PhraseQuery, and it should be possible to make them SpanQueries as well
> without impacting their existing performance. However, we can't do this
> while SpanQuery and its associated Weight and Spans classes are in their own
> package.
> I'd like to remove the o.a.l.search.spans package entirely, in a few stages:
> 1) Move SpanQuery, SpanWeight, Spans, SpanCollector and FilterSpans to
> o.a.l.search
> 2) Remove SpanTermQuery and merge its functionality into TermQuery
> 3) Move SpanNear, SpanNot, SpanOr and SpanMultiTermQueryWrapper to
> o.a.l.search
> 4) Move the remaining SpanQueries to the queries package
> Then we can look at, eg, making PhraseQuery a SpanQuery, removing
> SpanMTQWrapper and making MultiTermQuery a SpanQuery, etc.
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