Github user romseygeek commented on the issue:
https://github.com/apache/lucene-solr/pull/345
> For instance I don't think it should try to report matches whenever there
are no terms involved
The reason I did this was to make Boolean matching accurate. Say for
example you have a query that looks like `field:term OR (field:term2 AND
date:[2014-2018])`. If a document contains both `term` and `term2`, but its
date field falls outside that range, then we should only report a match on
`term`, which means the BooleanQuery matches() method needs to know about
matches from the date field. I think it's also useful when reporting 'which
fields did this query hit on'. The MatchAllDocsQuery is a corner case, I
admit, but it's the only one I think?
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