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https://issues.apache.org/jira/browse/LUCENE-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734063#action_12734063
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Uwe Schindler edited comment on LUCENE-1448 at 7/22/09 3:25 AM:
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This is not the only problem with multiple Tees: The offsets are also
completely mixed together, especially if the two tees feed into the sink at the
same time (not after each other). In my opinion, the last call to end should be
cached by the sink as end state (so if two tees add a end state to the sink,
the second one overwrites the first one).
was (Author: thetaphi):
This is not the only problem with multiple Tees: The offsets are also
completely mixed together, especially if the two tees feed into the sink at the
same time (not after each other). In my opinion, the last call to end should be
cached by the sink as end state (so if two tees add a end state to the tee, the
second one overwrites the first one).
> add getFinalOffset() to TokenStream
> -----------------------------------
>
> Key: LUCENE-1448
> URL: https://issues.apache.org/jira/browse/LUCENE-1448
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Reporter: Michael McCandless
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1448.patch, LUCENE-1448.patch, LUCENE-1448.patch,
> LUCENE-1448.patch
>
>
> If you add multiple Fieldable instances for the same field name to a
> document, and you then index those fields with TermVectors storing offsets,
> it's very likely the offsets for all but the first field instance will be
> wrong.
> This is because IndexWriter under the hood adds a cumulative base to the
> offsets of each field instance, where that base is 1 + the endOffset of the
> last token it saw when analyzing that field.
> But this logic is overly simplistic. For example, if the WhitespaceAnalyzer
> is being used, and the text being analyzed ended in 3 whitespace characters,
> then that information is lost and then next field's offsets are then all 3
> too small. Similarly, if a StopFilter appears in the chain, and the last N
> tokens were stop words, then the base will be 1 + the endOffset of the last
> non-stopword token.
> To fix this, I'd like to add a new getFinalOffset() to TokenStream. I'm
> thinking by default it returns -1, which means "I don't know so you figure it
> out", meaning we fallback to the faulty logic we have today.
> This has come up several times on the user's list.
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