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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-46998] Support &apos;let&apos; variables used within $merge custom pipeline update</title>
                <link>https://jira.mongodb.org/browse/SERVER-46998</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here we&apos;re talking about a $merge stage which uses &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/merge/#merge-whenmatched&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the pipeline option for &apos;whenMatched&apos;&lt;/a&gt;. If that custom pipeline references a variable defined in the &apos;let&apos; parameter to the aggregate command, it should work just fine.&lt;/p&gt;

&lt;p&gt;Split from&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46115&quot; title=&quot;Implement &amp;#39;let&amp;#39; parameters to aggregate commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46115&quot;&gt;&lt;del&gt;SERVER-46115&lt;/del&gt;&lt;/a&gt; since it depends on &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; to issue the sub-updates.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1282649">SERVER-46998</key>
            <summary>Support &apos;let&apos; variables used within $merge custom pipeline update</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="katherine.wu@mongodb.com">Katherine Wu</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Thu, 19 Mar 2020 18:24:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:32 +0000</updated>
                            <resolved>Mon, 18 May 2020 19:31:59 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3093623" author="xgen-internal-githook" created="Mon, 18 May 2020 19:27:06 +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-46998&quot; title=&quot;Support &amp;#39;let&amp;#39; variables used within $merge custom pipeline update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46998&quot;&gt;&lt;del&gt;SERVER-46998&lt;/del&gt;&lt;/a&gt; Support &apos;let&apos; variables used within $merge custom pipeline update&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/972ce94f18c972b1d648eb89a88f901965fa22dc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/972ce94f18c972b1d648eb89a88f901965fa22dc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3025975" author="charlie.swanson" created="Fri, 3 Apr 2020 20:32:49 +0000"  >&lt;p&gt;Correct. All &apos;let&apos; behaviors will remain unaffected, it will follow the same scoping rules as usual. Same as for $lookup which also has a &apos;let&apos; option. The innermost definition wins, much like in programming. As a concrete example:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;db.runCommand({&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;  aggregate: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;  pipeline: [{$merge: {into: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;target&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, let: {demo: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;INNER&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}, whenMatched: [{$set: {value: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$$demo&quot;&lt;/span&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;}}]}}],&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;  let: {demo: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;OUTER&quot;&lt;/span&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;},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Will use the value &quot;INNER&quot; inside the &apos;whenMatched&apos; pipeline. If &quot;$$demo&quot; were used in some other stage, it would take the value &quot;OUTER&quot;.&lt;/p&gt;</comment>
                            <comment id="3025264" author="asya" created="Fri, 3 Apr 2020 15:47:48 +0000"  >&lt;p&gt;$merge supports its own &lt;tt&gt;let&lt;/tt&gt; option - will that remain unchanged?&lt;/p&gt;

&lt;p&gt;if so will it mask pipeline level defined let variables?&lt;/p&gt;
</comment>
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            <issuekey id="1252607">SERVER-46708</issuekey>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1030702">DRIVERS-776</issuekey>
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            <issuekey id="1145293">SERVER-46115</issuekey>
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