[jira] Updated: (LUCENE-1389) SimpleSpanFragmenter can create very short fragments

["Mark Miller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Miller updated LUCENE-1389:
--------------------------------

    Attachment: Lucene-1389.patch

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
>            Priority: Minor
>         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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