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From Bjørn Hjelle (JIRA) <j...@apache.org>
Subject [jira] [Created] (SOLR-7926) Hit highlighting with EdgeNGramFilterFactory
Date Fri, 14 Aug 2015 10:52:46 GMT
Bjørn Hjelle created SOLR-7926:
----------------------------------

             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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