Rupert Westenthaler created LUCENE-8183:
-------------------------------------------
Summary: HyphenationCompoundWordTokenFilter creates overlapping
tokens with onlyLongestMatch enabled
Key: LUCENE-8183
URL: https://issues.apache.org/jira/browse/LUCENE-8183
Project: Lucene - Core
Issue Type: Bug
Components: modules/analysis
Affects Versions: 6.6
Environment: Configuration of the analyzer:
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.HyphenationCompoundWordTokenFilterFactory"
hyphenator="lang/hyph_de_DR.xml" encoding="iso-8859-1"
dictionary="lang/wordlist_de.txt"
onlyLongestMatch="true"/>
Reporter: Rupert Westenthaler
The HyphenationCompoundWordTokenFilter creates overlapping tokens even if
onlyLongestMatch is enabled.
Example:
Dictionary: {{gesellschaft}}, {{schaft}}
Hyphenator: {{de_DR.xml}} //from Apche Offo
onlyLongestMatch: true
|HCWTF|
|
|text|
|raw_bytes|
|start|
|end|
|positionLength|
|type|
|position|
|
|
|
|gesellschaft|
|[67 65 73 65 6c 6c 73 63 68 61 66 74]|
|0|
|12|
|1|
|word|
|1|
|
|
|
|gesellschaft|
|[67 65 73 65 6c 6c 73 63 68 61 66 74]|
|0|
|12|
|1|
|word|
|1|
|
|
|
|schaft|
|[73 63 68 61 66 74]|
|0|
|12|
|1|
|word|
|1|
|
|
IMHO this includes 2 unexpected Tokens
# the 2nd 'gesellschaft' as it duplicates the original token
# the 'schaft' as it is a sub-token 'gesellschaft' that is present in the
dictionary
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