Manuel Gellfart created LUCENE-7803:
---------------------------------------
Summary: Problem using FunctionScoreQuery and Highlighting
Key: LUCENE-7803
URL: https://issues.apache.org/jira/browse/LUCENE-7803
Project: Lucene - Core
Issue Type: Bug
Components: core/query/scoring, modules/highlighter
Affects Versions: 6.5
Reporter: Manuel Gellfart
Hey,
I just updated my Lucene to 6.5.0 and tried to get rid of the now deprecated
index-time field boosts.
So I did the suggested fix in the deprecation message and added FloatDocValues
to each Document holding the Boosts for each indexed field.
In my current Search Implementation there is one BooleanQuery per Field
containing three BoostQueries. To apply the field boosts from my DocValues I
wrapped each BooleanQuery inside a FunctionScoreQuery like this:
{code:WrappedBooleanQueries.java|borderStyle=solid}
BooleanQuery booleanQuery;
...
new FunctionScoreQuery(booleanQuery,
DoubleValuesSource.fromFloatField(fieldName));
{code}
So far it works as expected but I realized that my Highlighting is not working
anymore.
For Highlighting I use the following Snippet:
{code:title=MyHighlighting.java|borderStyle=solid}
public static String[] getFragmentsWithHighlightedTerms(Analyzer analyzer,
Query query, String fieldName, String fieldContents) {
QueryScorer scorer = new QueryScorer(query);
Fragmenter fragmenter = new SimpleFragmenter(80);
Highlighter highlighter = new Highlighter(new EscapeHtmlFormatter(),
scorer);
highlighter.setTextFragmenter(fragmenter);
highlighter.setMaxDocCharsToAnalyze(Integer.MAX_VALUE);
TextFragment[] fragments;
try {
TokenStream tokenStream = analyzer.tokenStream(fieldName,
fieldContents);
fragments = highlighter.getBestTextFragments(tokenStream,
fieldContents, true, 1);
} catch (InvalidTokenOffsetsException e) {
throw WrappedException.wrap(e);
}
return formatFragments(fragments);
}
}
{code}
When I remove the FunctionScorerQuery wrapped around my BooleanQueries the
Highlighting is perfectly fine again. Am I missing something here or is this a
bug?
PS: This is my first post here. I hope I did everything right ;)
Cheers
Manu
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
