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https://issues.apache.org/jira/browse/LUCENE-7091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15193500#comment-15193500
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David Smiley commented on LUCENE-7091:
--------------------------------------

My main concern is that it not be O(N^2).  Personally I'm not too concerned 
with ArrayUtil.grow's algorithm.  You might also pick an initial size of 
something like '4' for the SORTED_NUMERIC case (since it implies the intent to 
add more than 1).  With MemoryIndex I think speed is generally more important 
than memory size any way.

> Add doc values support to MemoryIndex
> -------------------------------------
>
>                 Key: LUCENE-7091
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7091
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>            Assignee: David Smiley
>         Attachments: LUCENE-7091.patch, LUCENE-7091.patch, LUCENE-7091.patch, 
> LUCENE-7091.patch, LUCENE-7091.patch, LUCENE-7091.patch, LUCENE-7091.patch
>
>
> Sometimes queries executed via the MemoryIndex require certain things to be 
> stored as doc values. Today this isn't possible because the memory index 
> doesn't support this and these queries silently return no results.



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