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Posted to dev@lucene.apache.org by "Bjørn Hjelle (JIRA)" <ji...@apache.org> on 2015/08/14 12:52:46 UTC
[jira] [Created] (SOLR-7926) Hit highlighting with
EdgeNGramFilterFactory
Bjørn Hjelle created SOLR-7926:
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Summary: Hit highlighting with EdgeNGramFilterFactory
Key: SOLR-7926
URL: https://issues.apache.org/jira/browse/SOLR-7926
Project: Solr
Issue Type: Bug
Components: highlighter
Affects Versions: 5.2.1, 5.1
Environment: CentOS 7 (5.2.1), OS X 10.10.5 (5.1)
Reporter: Bjørn Hjelle
Priority: Critical
Hithighlight highlights the whole word, not just the part that matches the search term when using EdgeNGramFilterFactory in the field type.
In schema.xml I have field type text_ngram:
<fieldType name="text_ngram" class="solr.TextField">
<analyzer type="index">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/>
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<!--tokenizer class="solr.StandardTokenizerFactory"/-->
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.EdgeNGramFilterFactory" maxGramSize="20" minGramSize="3" luceneMatchVersion="4.3"/>
<filter class="solr.PatternReplaceFilterFactory" pattern="([^\w\d\*æ?~F?~E])" replacement="" replace="all"/>
</analyzer>
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.WordDelimiterFilterFactory" generateWordParts="0" generateNumberParts="0" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="0"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.PatternReplaceFilterFactory" pattern="([^\w\d\*æ?~F?~E])" replacement="" replace="all"/>
<filter class="solr.PatternReplaceFilterFactory" pattern="^(.{20})(.*)?" replacement="$1" replace="all"/>
</analyzer>
</fieldType>
And dynamic field:
<dynamicField name="*_n" type="text_ngram" indexed="true" stored="true"/>
In Solr Admin analyse, with index value "lucene" and query value "luc" it shows this:
LENGTF text luc luce lucen lucene
raw_bytes [6c 75 63] [6c 75 63 65] [6c 75 63 65 6e] [6c 75 63 65 6e 65]
start 0 0 0 0
end 6 6 6 6
positionLength 1 1 1 1
type word word word word
position 1 1 1 1
Since the end position is 6 in this case the whole word ("lucene" is highlighted).
If I change to use NGramFilterFactory it shows me this (for the first three items):
LENGTF text luc uce cen
raw_bytes [6c 75 63] [6c 75 63 65] [6c 75 63 65 6e]
start 0 1 2
end 3 4 5
positionLength 1 1 1
type word word word
position 1 1 1
The end position is correct then and the highlighter highlights only the search term. Note that I have specified luceneMatchVersion="4.3". Without this, the end positions goes back to 6 also for the NGramFilterFactory.
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