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https://issues.apache.org/jira/browse/LUCENE-2411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859915#action_12859915
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Robert Muir commented on LUCENE-2411:
-------------------------------------
by the way, the most confusing example of this is the queryparser: which takes
a Locale parameter, but doesnt even use it for this operation, instead using
the default.
> clean up uses of String.toLowerCase in code
> -------------------------------------------
>
> Key: LUCENE-2411
> URL: https://issues.apache.org/jira/browse/LUCENE-2411
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 3.1
> Reporter: Robert Muir
> Fix For: 3.1
>
>
> Uwe recently fixed this in the ThaiWordFilter, which reminded me to search
> our code for use of String.toLowerCase()
> The problem with this method is the following:
> * it depends on the "default locale" which is flimsy and should be avoided I
> think, it typically just causes problems.
> This is because there can be hard-to-debug issues if the machine is not
> configured correctly for the same Locale
> at both index and query time.
> * lowercasing with locale-sensitive rules is really only suitable for display
> and presentation,
> if we want international lowercasing for search we should be using case
> folding.
> This is especially important since otherwise people unknowingly using this
> special casing at query-time are
> not going to get results, e.g. if they use a TermRangeQuery from the
> queryparser and it lowercases stuff differently.
> in my opinion we should fix all these methods to use Character.toLowerCase
> (if possible especially for speed with TokenStreams), otherwise
> String.toLowerCase
> with the ROOT Locale, new Locale(""). This is closer to case folding.
> If some things really need locale-sensitivity for some extreme reason I think
> we should just make the Locale
> a mandatory parameter.
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