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From "ASF subversion and git services (Jira)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-9045) Do not use TreeMap/TreeSet in BlockTree and PerFieldPostingsFormat
Date Mon, 02 Dec 2019 14:20:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986083#comment-16986083
] 

ASF subversion and git services commented on LUCENE-9045:
---------------------------------------------------------

Commit bb600e363823577fe2cb9b880e76b223fcf28ae8 in lucene-solr's branch refs/heads/branch_8x
from Bruno Roustant
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=bb600e3 ]

LUCENE-9045: Do not use TreeMap/TreeSet in BlockTree and PerFieldPostingsFormat.

Closes #1007


> 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
>          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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