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