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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-56157] Store MinMax data in flat data structure with user-defined field order</title>
                <link>https://jira.mongodb.org/browse/SERVER-56157</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the BucketCatalog uses a tree of StringMaps to store the min and max values for all fields stored in the bucket. This handles that objects inserted into the bucket may have an arbitrary field order set by the user.&lt;/p&gt;

&lt;p&gt;We should be able to optimize for a fixed field order where we can traverse the MinMax tree in lock-step with traversing the object that is to be inserted. If the MinMax tree is stored in a flat data structure it should be very cache friendly for iteration at the cost of making insertions more expensive. Iterating over the object and to determine if min or max need to be updated or updating fields already existing is a way more common operation than encountering a field not previously seen in the bucket.&lt;/p&gt;

&lt;p&gt;However, we still need to support objects with arbitrary field orders.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1682668">SERVER-56157</key>
            <summary>Store MinMax data in flat data structure with user-defined field order</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Apr 2021 12:32:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:49 +0000</updated>
                            <resolved>Wed, 5 May 2021 15:10:14 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3756286" author="xgen-internal-githook" created="Wed, 5 May 2021 13:32:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56157&quot; title=&quot;Store MinMax data in flat data structure with user-defined field order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56157&quot;&gt;&lt;del&gt;SERVER-56157&lt;/del&gt;&lt;/a&gt; Timeseries MinMax is now stored in a flat data structure to optimize traversal perf at the expense of inserts&lt;/p&gt;

&lt;p&gt;When users are inserting measurements with a consistent field order we don&apos;t need to search and can just traverse the MinMax structure in lock-step with the measurement.&lt;br/&gt;
If users do not provide a consistent field order we fallback to map lookup when we reach a certain search threshold to limit impact of linear search.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f43af643ccbd4bd2135dd5999410c2c5578fe1a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f43af643ccbd4bd2135dd5999410c2c5578fe1a&lt;/a&gt;&lt;/p&gt;</comment>
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