Alan Woodward created LUCENE-8300:
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             Summary: Add unordered-distinct IntervalsSource
                 Key: LUCENE-8300
                 URL: https://issues.apache.org/jira/browse/LUCENE-8300
             Project: Lucene - Core
          Issue Type: New Feature
            Reporter: Alan Woodward
            Assignee: Alan Woodward


[~mattweber] pointed out on LUCENE-8196 that {{Intervals.unordered()}} doesn't 
check to see if its subintervals overlap, which means that for example 
{{Intervals.unordered(Intervals.term("a"), Intervals.term("a"))}} would match a 
document with {{a}} appearing only once.  This ticket will introduce a new 
function, {{Intervals.unordered_distinct()}}, that ensures that all 
subintervals within an unordered interval do not overlap.



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