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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783807#action_12783807
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Simon Willnauer commented on LUCENE-2094:
-----------------------------------------

bq. I'm still failing to see why it shouldn't just always be enabled in the 
query parser. Solr forces it to always be enabled. Will this cause a bug in any 
scenarios?

it won't cause any bugs as far as I can see. The root cause for all this 
compatibility - we try hard to preserve bw compat with version all over the 
place. The reason for this setter is more or less some kind of "expert 
convenience" My personal feeling would be to make it always true / let version 
do it.



> Prepare CharArraySet for Unicode 4.0
> ------------------------------------
>
>                 Key: LUCENE-2094
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2094
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.3.3, 2.4, 
> 2.4.1, 2.4.2, 2.9, 2.9.1, 2.9.2, 3.0, 3.0.1, 3.1
>            Reporter: Simon Willnauer
>            Assignee: Uwe Schindler
>             Fix For: 3.1
>
>         Attachments: LUCENE-2094.patch, LUCENE-2094.patch, LUCENE-2094.patch, 
> LUCENE-2094.txt, LUCENE-2094.txt, LUCENE-2094.txt
>
>
> CharArraySet does lowercaseing if created with the correspondent flag. This 
> causes that  String / char[] with uncode 4 chars which are in the set can not 
> be retrieved in "ignorecase" mode.

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