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https://issues.apache.org/jira/browse/LUCENE-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Drew Foulks updated LUCENE-9045:
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Reporter: Bruno Roustant (was: Bruno Roustant)
> Do not use TreeMap/TreeSet in BlockTree and PerFieldPostingsFormat
> ------------------------------------------------------------------
>
> Key: LUCENE-9045
> URL: https://issues.apache.org/jira/browse/LUCENE-9045
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Bruno Roustant
> Assignee: Bruno Roustant
> Priority: Major
> Fix For: 8.4
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> TreeMap/TreeSet is a heavy structure designed to dynamically sort keys. It's
> iterator is much less performant than a list iterator. We should not use it
> when we don't need the sorting capability once built.
> And this is the case in BlockTreeTermsReader and PerFieldPostingsFormat. We
> need a Map and to sort keys at building time. But once built, we don't need
> to sort anymore, we can use a simple list for iteration efficiency.
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