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    <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>[DOCS-13620] Investigate changes in SERVER-46708: Support &apos;let&apos; variables in update command</title>
                <link>https://jira.mongodb.org/browse/DOCS-13620</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This patch allows users to specify let variables in update commands, through&lt;br/&gt;
both a top-level request parameter (&apos;let&apos;) and a parameter (&apos;c&apos;) for each update in the batch request. This currently focuses on unsharded deployments, with work on sharded environments to come in another ticket.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Replace the &apos;runtimeConstants&apos; support with the new &apos;let&apos; syntax from the aggregate command in the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/update/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update command&lt;/a&gt;. Similar to how that works, we should support both a top-level &apos;let&apos; parameter to the update request and also a parameter for each update in the batch request. For now, let&apos;s stick with the name &apos;c&apos; for the constants for each update in the batch, though we may revisit this name later.&lt;/p&gt;

&lt;p&gt;Note that we will have to preserve support for &apos;runtimeConstants&apos; for compatibility during upgrade. There will be a problem where an internal update request built on behalf of $merge will need to specify variables. This is done &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8a9d5677f500293448311e6c551549b60cbfc780/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L616&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. It&apos;s important for those variables/constants to be serialized as runtimeConstants, again for compatibility during upgrade. I would recommend making this work as part of this ticket, but if it becomes obvious how to split it into follow-up work we should do that.&lt;/p&gt;

&lt;p&gt;For this work, focus only on unsharded deployments.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1332103">DOCS-13620</key>
            <summary>Investigate changes in SERVER-46708: Support &apos;let&apos; variables in update command</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="jason.price@mongodb.com">Jason Price</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Apr 2020 22:12:56 +0000</created>
                <updated>Mon, 13 Nov 2023 18:05:55 +0000</updated>
                            <resolved>Thu, 12 Nov 2020 00:19:25 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3486216" author="xgen-internal-githook" created="Wed, 11 Nov 2020 20:26:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Price&apos;, &apos;email&apos;: &apos;jason.price@mongodb.com&apos;, &apos;username&apos;: &apos;jason-price-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13620&quot; title=&quot;Investigate changes in SERVER-46708: Support &amp;#39;let&amp;#39; variables in update command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13620&quot;&gt;&lt;del&gt;DOCS-13620&lt;/del&gt;&lt;/a&gt; Let variables in update&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/026715ece571e2ab88283992ac409fd32c6ffb3e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/026715ece571e2ab88283992ac409fd32c6ffb3e&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1252607">SERVER-46708</issuekey>
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