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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47476] Make it possible to store a few elements in MultikeyComponents and MultikeyPaths without having to allocate memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-47476</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We can take advantage of the fact that compound indexes with many fields and dotted paths with many parts are uncommon.&lt;/p&gt;

&lt;p&gt;Optimize for the common cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1311393">SERVER-47476</key>
            <summary>Make it possible to store a few elements in MultikeyComponents and MultikeyPaths without having to allocate memory</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>Fri, 10 Apr 2020 20:00:46 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:39 +0000</updated>
                            <resolved>Mon, 20 Apr 2020 16:45:23 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3059189" author="henrik.edin" created="Tue, 28 Apr 2020 18:34:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jmikola&quot; class=&quot;user-hover&quot; rel=&quot;jmikola&quot;&gt;jmikola&lt;/a&gt; I wasn&apos;t sure of the impact so I clicked all the buttons. Sounds like it doesn&apos;t affect you, just wanted to be on the safe side.&lt;/p&gt;</comment>
                            <comment id="3059026" author="jmikola@gmail.com" created="Tue, 28 Apr 2020 17:33:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin&quot;&gt;henrik.edin&lt;/a&gt;: Can you elaborate on how this change may affect drivers (re: DRIVERS-1202)? If I understand correctly, the commit is reducing the allowed limit for the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fccca7a804efdaf008ba859ceeb09d62444b2738/src/mongo/bson/bson_depth.h#L52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;maxBSONDepth&lt;/tt&gt;&lt;/a&gt; server parameter, so I wouldn&apos;t expect any impact on drivers if they currently do not impose any limits on the creation of BSON documents today. I don&apos;t believe any drivers have limits for decoding, but if so, I don&apos;t expect that a more conservative limit on the server would not pose any problem.&lt;/p&gt;

&lt;p&gt;On a separate note, I didn&apos;t find &lt;tt&gt;maxBSONDepth&lt;/tt&gt; documented as a &lt;a href=&quot;https://docs.mongodb.com/manual/reference/parameters/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;server parameter&lt;/a&gt;, and &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Nested-Depth-for-BSON-Documents&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Nested Depth for BSON Documents&lt;/a&gt; documents a fix limit of 100 with no mention of this being configurable. Do you suppose that would warrant a documentation ticket?&lt;/p&gt;</comment>
                            <comment id="3047249" author="xgen-internal-githook" created="Mon, 20 Apr 2020 15:41:58 +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-47476&quot; title=&quot;Make it possible to store a few elements in MultikeyComponents and MultikeyPaths without having to allocate memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47476&quot;&gt;&lt;del&gt;SERVER-47476&lt;/del&gt;&lt;/a&gt; Use small_vector to be able to store a few multikey components without allocating memory&lt;/p&gt;

&lt;p&gt;Also cleaned up FieldRef&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fccca7a804efdaf008ba859ceeb09d62444b2738&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fccca7a804efdaf008ba859ceeb09d62444b2738&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1323099">DOCS-13604</issuekey>
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            <issuekey id="1282999">SERVER-47001</issuekey>
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