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https://issues.apache.org/jira/browse/LUCENE-3058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028109#comment-13028109
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Uwe Schindler commented on LUCENE-3058:
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:-) It always confuses me, too. But if you think more about it, it makes sense 
to return false. But it's the same always for me: Whenever I write equals() 
methods, this question pops up. But now I mostly copy code like the one above 
from other classes. But you have to note: The above equals() code is only 100% 
suitable for final classes, else it could happen that a subclass that extends 
some fields is equal. But thats more a theoretical discussion. E.g. Lucene's 
Queries always check this.getClass()==other.getClass().

> FST should allow more than one output for the same input
> --------------------------------------------------------
>
>                 Key: LUCENE-3058
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3058
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-3058.patch, LUCENE-3058.patch
>
>
> For the block tree terms dict, it turns out I need this case.

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