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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2016) replace invalid U+FFFF character during indexing
Date Thu, 29 Oct 2009 18:19:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771531#action_12771531
] 

Yonik Seeley commented on LUCENE-2016:
--------------------------------------

bq. This is not true. if you map them to replacement characters, then my app is free to use
them "process-internally" 

Tricky semantics :-)  It rather depends on if you consider Lucene part if your "process-internally"
.  Depending on the use case, it could be either.


> replace invalid U+FFFF character during indexing
> ------------------------------------------------
>
>                 Key: LUCENE-2016
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2016
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.4, 2.4.1, 2.9
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.9.1, 3.0
>
>         Attachments: LUCENE-2016.patch
>
>
> If the invalid U+FFFF character is embedded in a token, it actually causes indexing to
silently corrupt the index by writing duplicate terms into the terms dict.  CheckIndex will
catch the error, and merging will hit exceptions (I think).
> We already replace invalid surrogate pairs with the replacement character U+FFFD, so
I'll just do the same with U+FFFF.

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