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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2016) replace invalid U+FFFF character during indexing
Date Thu, 29 Oct 2009 18:11:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771526#action_12771526
] 

Robert Muir commented on LUCENE-2016:
-------------------------------------

{quote}
But if we forcefully map all invalid-for-interchange unicode characters to the replacement
character (I think that's what's being proposed, right?), then your app no longer has any
characters it can use for its own "internal" purposes?
{quote}

This is not true. if you map them to replacement characters, then my app is free to use them
"process-internally" as specified by the standard, without any concern that they will appear
in the "interchange" (lucene index data).

I agree with you, lets open a separate "anal unicode issue". Lets go with your U+FFFF fix
for Lucene 2.9, since it fixes lucene java, but correct this for 3.x in the future?



> 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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