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https://issues.apache.org/jira/browse/LUCENE-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller resolved LUCENE-1389.
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Resolution: Fixed
Thanks Andrew.
> 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
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 2.9
>
> Attachments: Lucene-1389.patch, positions.patch, tailfragments.patch
>
>
> 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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