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From "Koji Sekiguchi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-1824) FastVectorHighlighter truncates words at beginning and end of fragments
Date Tue, 06 Sep 2011 03:53:09 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097727#comment-13097727
] 

Koji Sekiguchi commented on LUCENE-1824:
----------------------------------------

Forgot one comment. I've not taken care of Solr yet in the patch.

> FastVectorHighlighter truncates words at beginning and end of fragments
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-1824
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1824
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/highlighter
>         Environment: any
>            Reporter: Alex Vigdor
>            Assignee: Koji Sekiguchi
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-1824.patch, LUCENE-1824.patch
>
>
> FastVectorHighlighter does not take word boundaries into consideration when building
fragments, so that in most cases the first and last word of a fragment are truncated.  This
makes the highlights less legible than they should be.  I will attach a patch to BaseFragmentBuilder
that resolves this by expanding the start and end boundaries of the fragment to the first
whitespace character on either side of the fragment, or the beginning or end of the source
text, whichever comes first.  This significantly improves legibility, at the cost of returning
a slightly larger number of characters than specified for the fragment size.

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