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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-69474] Add a helper for finding modified field names from pre and post images</title>
                <link>https://jira.mongodb.org/browse/SERVER-69474</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To calculate the percentage of shard key updates, during query sampling we will need to additionally write down what fields each update modified. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69237&quot; title=&quot;Make the preImage document always available to CollectionUpdateArgs from UpdateStage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69237&quot;&gt;&lt;del&gt;SERVER-69237&lt;/del&gt;&lt;/a&gt; will allow the OpObserver to always have access to both the pre-image and post-image. Given this, we can compute the $v2 diff for each update using &lt;a href=&quot;https://github.com/10gen/mongo/blob/18545807095a982a8b527ec3eb1e45a447d06719/src/mongo/db/update/document_diff_calculator.h#L44-L55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the doc_diff::computeDiff() helper&lt;/a&gt;. However, the format of the returned diff does not meet our use case for the following the reasons:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The diff is recursive. That is, the diff for each object and array field is itself a $v2 diff and the field name is prefixed by &quot;s&quot;. Please see &lt;a href=&quot;https://docs.google.com/document/d/1sxGrck8X0r0W37UVLFwV8vaUQv3OM8xlyWWvHB5M2ew/edit#bookmark=kix.s62xnzts62g0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this section&lt;/a&gt; of the design document for PM-1460 for more details.&lt;/li&gt;
	&lt;li&gt;The diff contains the new values for each updated field. The values are not needed in our use case and can cause the diff to exceed the 16MB BSON size limit.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This ticket is to add a helper that takes in pre and post images and serializes the DocumentSubDiffNode returned by &lt;a href=&quot;https://github.com/10gen/mongo/blob/13096e75c224d4ab7231a8788005c41fee8d7991/src/mongo/db/update/document_diff_calculator.cpp#L243&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;computeDocDiff()&lt;/a&gt; into a BSONObj diff of the following format:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&#160;&#160;&#160;&amp;lt;fieldName&amp;gt;: &apos;i&apos;|&apos;u&apos;|&apos;d&apos;,&#160;&#160;&#160;&amp;lt;arrFieldName&amp;gt;: &apos;i&apos;|&apos;u&apos;|&apos;d&apos;,&#160;&#160;&#160;&amp;lt;objFieldName&amp;gt;: {&#160;&#160;&#160;&#160;&#160;&amp;lt;fieldName&amp;gt;: &apos;i&apos;|&apos;u&apos;|&apos;d&apos;,&#160;&#160;&#160;&#160;&#160;...,&#160;&#160;&#160;},&#160;&#160;&#160;...} &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;That is, the diff will have the same schema as the document that the update modifies. The value of each field will be set to either &apos;i&apos;, &apos;u&apos; or &apos;d&apos; to indicate that the field was inserted, updated and deleted, respectively. The fields that did not change will not show up in the diff.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2130035">SERVER-69474</key>
            <summary>Add a helper for finding modified field names from pre and post images</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Sep 2022 16:32:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:34 +0000</updated>
                            <resolved>Wed, 28 Sep 2022 04:07:46 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4860587" author="xgen-internal-githook" created="Wed, 28 Sep 2022 03:24:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69474&quot; title=&quot;Add a helper for finding modified field names from pre and post images&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69474&quot;&gt;&lt;del&gt;SERVER-69474&lt;/del&gt;&lt;/a&gt; Add a helper for finding modified field names from pre and post images&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/911955a568b01620fcad0dfe35692862b4d4818f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/911955a568b01620fcad0dfe35692862b4d4818f&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2111927">SERVER-68759</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
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            <issuekey id="2124760">SERVER-69237</issuekey>
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