[jira] [Created] (LUCENE-7719) UnifiedHighlighter doesn't handle some AutomatonQuery's with multi-byte chars

["David Smiley (JIRA)" <ji...@apache.org>]

David Smiley created LUCENE-7719:
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             Summary: UnifiedHighlighter doesn't handle some AutomatonQuery's with multi-byte chars
                 Key: LUCENE-7719
                 URL: https://issues.apache.org/jira/browse/LUCENE-7719
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/highlighter
            Reporter: David Smiley


In MultiTermHighlighting, a CharacterRunAutomaton is being created that takes the result of AutomatonQuery.getAutomaton that in turn is byte oriented, not character oriented.  For ASCII terms, this is safe but it's not for multi-byte characters.  This is most likely going to rear it's head with a WildcardQuery, but due to special casing in MultiTermHighlighting, PrefixQuery isn't affected.  Nonetheless it'd be nice to get a general fix in so that MultiTermHighlighting can remove special cases for PrefixQuery and TermRangeQuery (both subclass AutomatonQuery).

AFAICT, this bug was likely in the PostingsHighlighter since inception.



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