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From "Alan Woodward (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4479) TokenSources.getTokenStream() doesn't return correctly for termvectors with positions but no offsets
Date Fri, 12 Oct 2012 14:33:06 GMT
Alan Woodward created LUCENE-4479:
-------------------------------------

             Summary: TokenSources.getTokenStream() doesn't return correctly for termvectors
with positions but no offsets
                 Key: LUCENE-4479
                 URL: https://issues.apache.org/jira/browse/LUCENE-4479
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/highlighter
    Affects Versions: 4.0
            Reporter: Alan Woodward
            Priority: Minor


The javadocs for TokenSources.getTokenStream(Terms, boolean) state:

"Low level api. Returns a token stream or null if no offset info available
in index. This can be used to feed the highlighter with a pre-parsed token
stream"

However, if the Terms instance passed in has positions but no offsets stored, a TokenStream
is incorrectly returned, rather than null.

This has the effect of incorrectly highlighting fields with term vectors and positions, but
no offsets.  All highlighting markup is prepended to the beginning of the field.

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