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https://issues.apache.org/jira/browse/LUCENE-6630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604864#comment-14604864
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Robert Muir commented on LUCENE-6630:
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{quote}
Maybe we should always just be sparse, unless it's complete dense?
{quote}
-1
Don't even think about it.
When I said I wouldn't let abuse cases hurt real use cases, did you think I was
joking? I'm not going to let real users have shitty performance here.
> Further improve memory of FieldInfos
> ------------------------------------
>
> Key: LUCENE-6630
> URL: https://issues.apache.org/jira/browse/LUCENE-6630
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Ryan Ernst
> Attachments: LUCENE-6630.patch
>
>
> In LUCENE-6325, FieldInfos were improved to use an array except in very
> sparse cases. In the sparse cases, a TreeMap is still used. However, even in
> the sparse case, we can still use an array, and then use binary search. The
> perf will be equivalent, but memory use should be much less.
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