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From "Andrew Duffy (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1389) SimpleSpanFragmenter can create very short fragments
Date Wed, 17 Sep 2008 10:55:44 GMT
SimpleSpanFragmenter can create very short fragments
----------------------------------------------------

                 Key: LUCENE-1389
                 URL: https://issues.apache.org/jira/browse/LUCENE-1389
             Project: Lucene - Java
          Issue Type: Bug
          Components: contrib/highlighter
    Affects Versions: 2.3.2
            Reporter: Andrew Duffy
            Priority: Minor


Line 74 of SimpleSpanFragmenter returns true when the current token is the start of a hit
on a span or phrase, thus starting a new fragment. Two problems occur:

- The previous fragment may be very short, but if it contains a hit it will be combined with
the new fragment later so this disappears.
- If the token is close to a natural fragment boundary the new fragment will end up very short;
possibly even as short as just the span or phrase itself. This is the result of creating a
new fragment without incrementing currentNumFrags.

To fix, remove or comment out line 74. The result is that fragments average to the fragment
size unless a span or phrase hit is towards the end of the fragment - that fragment is made
larger and the following fragment shorter to accommodate the hit.

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