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https://issues.apache.org/jira/browse/LUCENE-5202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13761475#comment-13761475
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Benson Margulies commented on LUCENE-5202:
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OK, I see.
So I'll leave it to you to apply this patch to pick up the fix you made.
thanks
> LookaheadTokenFilter consumes an extra token in nextToken
> ---------------------------------------------------------
>
> Key: LUCENE-5202
> URL: https://issues.apache.org/jira/browse/LUCENE-5202
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.3.1
> Reporter: Benson Margulies
> Attachments: LUCENE-5202.patch, LUCENE-5202.patch
>
>
> This is a bit hard to explain except by looking at the test case. I've coded
> a filter that uses LookaheadTokenFilter. The incrementToken method peeks some
> tokens. Then, it seems, nextToken in the Lookahead class calls peekToken
> itself, which seems to me to consume a token so that it's not seen when the
> derived class sets out to process the next set of tokens.
> In passing, this test case can be used to demonstrate that it does not work
> to try to use the afterPosition method to set up attributes of the token that
> we're 'after'. Probably that was never intended. However, I'm hoping for some
> feedback as to whether the rest of the structure here is as intended for
> subclasses of LookaheadTokenFilter.
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