Query basic filter with correction feature
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Key: NUTCH-72
URL: http://issues.apache.org/jira/browse/NUTCH-72
Project: Nutch
Type: New Feature
Components: searcher
Environment: lucene
Reporter: Christophe Noel
This plugin improves query-basic plugin with a correction feature.
Lucene includes FuzzyQuery feature which consists of searching not only for
matching terms, but searching for very similar terms too.
This plugin should be used instead of query-basic, for people looking for an
easy solution about users query requests correction.
Correction Query Plugin can be used as follows :
Solution 1 : If you want to search for very similar terms, add
autocorrectionmod as the first term of the query (example : 'nutch engine' ->
'autocorrectionmod nutch engine')
Solution 2 : Create a new search.jsp page which include a "correction" checkbox
management (<input type="checkbox" name="autocorrection" value="true"> may
automatically add 'autocorrectionmod' as the first term of the query)
QueryFuzzy knows a big problem : it is very slow for large index !
So Correction Query Plugin works as follows :
- it is not useful for big indexes
- it only works for 5 characters and more words
- it only look for words matching with the 2 first characters (to improve
performance this should be set to 3/4)
- it only works for 65 % matching suffixes (algorithm is levenstein)
PLease give your opinion about it.
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