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https://issues.apache.org/jira/browse/LUCENE-10097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423780#comment-17423780
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Bruno Roustant commented on LUCENE-10097:
-----------------------------------------
Based on remarks in the PRs, I'm closing this Jira issue as HashMap + List is
too complicated and TreeMap was a deliberated choice for keeping the memory
usage low.
Maybe I'll come back later with another proposal as I think most of the time we
use TreeMap whereas the intent is to build an immutable sorted map, which could
be more memory efficient.
> Replace TreeMap use by HashMap when unnecessary
> -----------------------------------------------
>
> Key: LUCENE-10097
> URL: https://issues.apache.org/jira/browse/LUCENE-10097
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Bruno Roustant
> Assignee: Bruno Roustant
> Priority: Major
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> There are a couple of places where TreeMap is used although it could easily
> be replaced by a HashMap with potentially a single sort. Sometimes it would
> bring perf improvement (e.g. when TreeMap.entrySet() is called), other times
> it's more for consistency to use a simpler HashMap if there is no strong need
> for a TreeMap.
> I saw other places where we have TODOs to see whether we can replace the
> TreeMap, but when it is more complex, I'll prefer to open separate Jira
> issues.
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