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https://issues.apache.org/jira/browse/LUCENE-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797501#action_12797501
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Jens Muecke commented on LUCENE-1489:
-------------------------------------
I tried this patch. After applying, following testcase fail:
{noformat}
[junit] Testcase:
testOverlapAnalyzer2(org.apache.lucene.search.highlight.HighlighterTest): FAILED
[junit] null expected:<<B>Hi[-]Speed</B>10 foo> but
was:<<B>Hi[</B>-<B>]Speed</B>10 foo>
[junit] junit.framework.ComparisonFailure: null
expected:<<B>Hi[-]Speed</B>10 foo> but was:<<B>Hi[</B>-<B>]Speed</B>10 foo>
[junit] at
org.apache.lucene.search.highlight.HighlighterTest$30.run(HighlighterTest.java:1558)
[junit] at
org.apache.lucene.search.highlight.SynonymTokenizer$TestHighlightRunner.start(HighlighterTest.java:1947)
[junit] at
org.apache.lucene.search.highlight.HighlighterTest.testOverlapAnalyzer2(HighlighterTest.java:1594)
[junit] at
org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:212)
[junit]
[junit]
[junit] Test org.apache.lucene.search.highlight.HighlighterTest FAILED
{noformat}
> highlighter problem with n-gram tokens
> --------------------------------------
>
> Key: LUCENE-1489
> URL: https://issues.apache.org/jira/browse/LUCENE-1489
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/highlighter
> Reporter: Koji Sekiguchi
> Priority: Minor
> Attachments: LUCENE-1489.patch, lucene1489.patch
>
>
> I have a problem when using n-gram and highlighter. I thought it had been
> solved in LUCENE-627...
> Actually, I found this problem when I was using CJKTokenizer on Solr, though,
> here is lucene program to reproduce it using NGramTokenizer(min=2,max=2)
> instead of CJKTokenizer:
> {code:java}
> public class TestNGramHighlighter {
> public static void main(String[] args) throws Exception {
> Analyzer analyzer = new NGramAnalyzer();
> final String TEXT = "Lucene can make index. Then Lucene can search.";
> final String QUERY = "can";
> QueryParser parser = new QueryParser("f",analyzer);
> Query query = parser.parse(QUERY);
> QueryScorer scorer = new QueryScorer(query,"f");
> Highlighter h = new Highlighter( scorer );
> System.out.println( h.getBestFragment(analyzer, "f", TEXT) );
> }
> static class NGramAnalyzer extends Analyzer {
> public TokenStream tokenStream(String field, Reader input) {
> return new NGramTokenizer(input,2,2);
> }
> }
> }
> {code}
> expected output is:
> Lucene <B>can</B> make index. Then Lucene <B>can</B> search.
> but the actual output is:
> Lucene <B>can make index. Then Lucene can</B> search.
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