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Posted to dev@lucene.apache.org by "Jan Høydahl (JIRA)" <ji...@apache.org> on 2015/08/14 16:14:45 UTC
[jira] [Reopened] (SOLR-7926) Hit highlighting with
EdgeNGramFilterFactory
[ https://issues.apache.org/jira/browse/SOLR-7926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jan Høydahl reopened SOLR-7926:
-------------------------------
Reopening for now as I just saw that the topic was indeed discussed on the users list in 2014: http://search-lucene.com/m/eHNlhqgvy1kWzc82
> 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: 5.1, 5.2.1
> Environment: CentOS 7 (5.2.1), OS X 10.10.5 (5.1)
> Reporter: Bjørn Hjelle
> Priority: Critical
> Labels: EdgeNGramTokenFilter, highlighting
>
> Hit highlight 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>
> 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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