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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-46708] Support &apos;let&apos; variables in update command</title>
                <link>https://jira.mongodb.org/browse/SERVER-46708</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="1252607">SERVER-46708</key>
            <summary>Support &apos;let&apos; variables in update command</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="katherine.wu@mongodb.com">Katherine Wu</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Mon, 9 Mar 2020 14:16:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:06 +0000</updated>
                            <resolved>Tue, 28 Apr 2020 22:12:56 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3059575" author="xgen-internal-githook" created="Tue, 28 Apr 2020 21:57:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Katherine Wu&apos;, &apos;email&apos;: &apos;katherine.wu@mongodb.com&apos;, &apos;username&apos;: &apos;kaywux&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46708&quot; title=&quot;Support &amp;#39;let&amp;#39; variables in update command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46708&quot;&gt;&lt;del&gt;SERVER-46708&lt;/del&gt;&lt;/a&gt; Support let variables in update command&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/53e1d78e950bb98f84fc0e0e48c341404f7f90ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/53e1d78e950bb98f84fc0e0e48c341404f7f90ed&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1145293">SERVER-46115</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1255220">SERVER-46737</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1260015">SERVER-46772</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1253255">SERVER-46715</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1253271">SERVER-46716</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1282649">SERVER-46998</issuekey>
        </issuelink>
                            </inwardlinks>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="1332103">DOCS-13620</issuekey>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2241372">SERVER-73231</issuekey>
        </issuelink>
                            </inwardlinks>
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