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https://issues.apache.org/jira/browse/LUCENE-4046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-4046:
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    Attachment: LUCENE-4046.patch

here is a patch adding IOException to DocsEnum#freq()


                
> Allows IOException in DocsEnum#freq()
> -------------------------------------
>
>                 Key: LUCENE-4046
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4046
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Renaud Delbru
>            Assignee: Simon Willnauer
>              Labels: codec, index
>             Fix For: 4.0
>
>         Attachments: LUCENE-4046.patch
>
>
> Currently, DocsEnum#freq() does not allow IOException. This is problematic if 
> somebody wants to implement a codec that allows lazy loading of freq. 
> Frequency will be read and decoded only when #freq() will be called, 
> therefore calling IndexInput's read methods that can throw IOException.
> The current workaround is to catch the IOException in freq() and ignore it 
> (which is not very nice and not a good solution).

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