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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55501] Avoid element-wise iteration and copy when appending to an object in doc_diff::applyDiff</title>
                <link>https://jira.mongodb.org/browse/SERVER-55501</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current algorithm iterates over each field in the subdocument and copies it individually when adding a new field. In the timeseries case, where we may have hundreds of fields in each &quot;column&quot;, this can be pretty bad quadratic behavior. The goal of this task is not to remove the quadratic behavior, but rather to minimize the coefficient for it by short-cutting: when we know we are just appending a field, we can take advantage of this to do a memcpy on the underlying BSON binary data, and just adjust the length for the subdocument to account for the new element.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1658073">SERVER-55501</key>
            <summary>Avoid element-wise iteration and copy when appending to an object in doc_diff::applyDiff</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="9">Done</resolution>
                                        <assignee username="dan.larkin-york@mongodb.com">Dan Larkin-York</assignee>
                                    <reporter username="dan.larkin-york@mongodb.com">Dan Larkin-York</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Mar 2021 19:01:37 +0000</created>
                <updated>Thu, 29 Apr 2021 13:05:50 +0000</updated>
                            <resolved>Thu, 29 Apr 2021 13:05:50 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
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                            <comment id="3745470" author="xgen-internal-githook" created="Wed, 28 Apr 2021 22:12:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dan Larkin-York&apos;, &apos;email&apos;: &apos;dan.larkin-york@mongodb.com&apos;, &apos;username&apos;: &apos;dhly-etc&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55501&quot; title=&quot;Avoid element-wise iteration and copy when appending to an object in doc_diff::applyDiff&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55501&quot;&gt;&lt;del&gt;SERVER-55501&lt;/del&gt;&lt;/a&gt; Avoid element-wise iteration and copy when appending to an object in doc_diff::applyDiff&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09e418805e9019cb56e54d240c7c7d9bcb95e339&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09e418805e9019cb56e54d240c7c7d9bcb95e339&lt;/a&gt;&lt;/p&gt;</comment>
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