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https://issues.apache.org/jira/browse/LUCENE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893579#action_12893579
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Michael McCandless commented on LUCENE-2558:
--------------------------------------------

Resolving deleted terms -> doc IDs doesn't require a sorted terms dict right?  
Ie a simple hash lookup suffices?

> Use sequence ids for deleted docs
> ---------------------------------
>
>                 Key: LUCENE-2558
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2558
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: Realtime Branch
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: Realtime Branch
>
>
> Utilizing the sequence ids created via the update document
> methods, we will enable IndexReader deleted docs over a sequence
> id array. 
> One of the decisions is what primitive type to use. We can start
> off with an int[], then possibly move to a short[] (for lower
> memory consumption) that wraps around.

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