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https://issues.apache.org/jira/browse/SOLR-4277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jack Krupansky updated SOLR-4277:
---------------------------------
Component/s: (was: SearchComponents - other)
spellchecker
> Spellchecker sometimes falsely reports a spelling error and correction
> ----------------------------------------------------------------------
>
> Key: SOLR-4277
> URL: https://issues.apache.org/jira/browse/SOLR-4277
> Project: Solr
> Issue Type: Bug
> Components: spellchecker
> Affects Versions: 4.0
> Reporter: Jack Krupansky
>
> In some cases, the Solr spell checker improperly reports query terms as being
> misspelled.
> Using the Solr example for 4.0, I added these mini documents:
> {code}
> curl http://localhost:8983/solr/update?commit=true -H
> 'Content-type:application/csv' -d '
> id,name
> spel-1,aardvark abacus ball bill cat cello
> spel-2,abate accord band bell cattle check
> spel-3,adorn border clean clock'
> {code}
> I then issued this request:
> {code}
> curl "http://localhost:8983/solr/spell/?q=check&indent=true";
> {code}
> The spell checker falsely concluded that "check" was misspelled and
> improperly corrected it to "clock":
> {code}
> <lst name="spellcheck">
> <lst name="suggestions">
> <lst name="check">
> <int name="numFound">1</int>
> <int name="startOffset">0</int>
> <int name="endOffset">5</int>
> <int name="origFreq">1</int>
> <arr name="suggestion">
> <lst>
> <str name="word">clock</str>
> <int name="freq">1</int>
> </lst>
> </arr>
> </lst>
> <bool name="correctlySpelled">false</bool>
> <lst name="collation">
> <str name="collationQuery">clock</str>
> <int name="hits">1</int>
> <lst name="misspellingsAndCorrections">
> <str name="check">clock</str>
> </lst>
> </lst>
> </lst>
> </lst>
> {code}
> And if I query for "clock", it gets corrected to "check"!
> {code}
> curl "http://localhost:8983/solr/spell/?q=clock&indent=true";
> {code}
> {code}
> <lst name="suggestions">
> <lst name="clock">
> <int name="numFound">1</int>
> <int name="startOffset">0</int>
> <int name="endOffset">5</int>
> <int name="origFreq">1</int>
> <arr name="suggestion">
> <lst>
> <str name="word">check</str>
> <int name="freq">1</int>
> </lst>
> </arr>
> </lst>
> <bool name="correctlySpelled">false</bool>
> <lst name="collation">
> <str name="collationQuery">check</str>
> <int name="hits">1</int>
> <lst name="misspellingsAndCorrections">
> <str name="clock">check</str>
> </lst>
> </lst>
> </lst>
> {code}
> Note: This appears to be only because "clock" is so close to "check". With
> other terms I don't see the problem:
> {code}
> curl "http://localhost:8983/solr/spell/?q=cattle+abate+check&indent=true";
> {code}
> {code}
> <lst name="suggestions">
> <lst name="check">
> <int name="numFound">1</int>
> <int name="startOffset">13</int>
> <int name="endOffset">18</int>
> <int name="origFreq">1</int>
> <arr name="suggestion">
> <lst>
> <str name="word">clock</str>
> <int name="freq">1</int>
> </lst>
> </arr>
> </lst>
> <bool name="correctlySpelled">false</bool>
> <lst name="collation">
> <str name="collationQuery">cattle abate clock</str>
> <int name="hits">2</int>
> <lst name="misspellingsAndCorrections">
> <str name="cattle">cattle</str>
> <str name="abate">abate</str>
> <str name="check">clock</str>
> </lst>
> </lst>
> </lst>
> {code}
> Although, it inappropriately lists "cattle" and "abate" in the "misspellings"
> section even though no suggestions were offered.
> Finally, I can workaround this issue by removing the following line from
> solrconfig.xml:
> {code}
> <str name="spellcheck.alternativeTermCount">5</str>
> {code}
> Which responds to the previous request with:
> {code}
> <lst name="suggestions">
> <bool name="correctlySpelled">false</bool>
> </lst>
> {code}
> Which makes the original problem go away. Although, it does beg the question
> as to why my 100% correct query is still tagged as "correctlySpelled" =
> "false", but that's a separate Jira.
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