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From "DM Smith (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2094) Prepare CharArraySet for Unicode 4.0
Date Mon, 30 Nov 2009 21:09:20 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783842#action_12783842
] 

DM Smith commented on LUCENE-2094:
----------------------------------

bq. If you create the StopFilter with Version.LUCENE_29 it is enabled. If you pass this version
to QP, it's enabled, too. Very simple?

Yes. But, IMHO, this seems like advocating that a desired behavior be gained by a backward
compatibility mechanism.

I see two problems in using Version to enable position increments (or any other particular
behavior):
a) If a prior behavior is desired now, one should not need to use a prior Version to get it.
b) Version codifies a particular combination of behavior. It does not allow for rolling one's
combination.

Make that 3 problems:
c) At some point a prior version's behavior will/should be removed.

It seems like this was discussed at length for creating a Settings object. I'd rather see
Attribute/AttributeSources used for such a thing than Version.

> 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.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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