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From "Mike Klaas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-257) Add ability for WordDelimiterFilter to ignore case changes
Date Thu, 07 Jun 2007 21:53:26 GMT

    [ https://issues.apache.org/jira/browse/SOLR-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12502546
] 

Mike Klaas commented on SOLR-257:
---------------------------------

The difference from generateWordParts is as follows:  gWP splits adjacent tokens to see if
they are both alpha regardless of how they are delimited.  So if gWP=0, then PowerShot=power-shot=Power-Shot=powershot.
 If gWP=1 and ignoreCaseChange=1, then PowerShot=powershot, but Power-Shot=power-shot=power
shot.

For us, case changes were too "weak" a delimiter, and high idf subwords were inappropriately
driving up relevancy on certain docs.



> Add ability for WordDelimiterFilter to ignore case changes 
> -----------------------------------------------------------
>
>                 Key: SOLR-257
>                 URL: https://issues.apache.org/jira/browse/SOLR-257
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>    Affects Versions: 1.2
>            Reporter: Mike Klaas
>            Assignee: Mike Klaas
>            Priority: Trivial
>             Fix For: 1.3
>
>         Attachments: ignoreCaseChange.patch
>
>
> patch adds ignoreCaseChange option to WordDelimiterFilter, which I have used and it may
be more generally useful

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