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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-34927] allow localField and foreignField with more expressive $lookup pipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-34927</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This proposes closing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29376&quot; title=&quot;Rewrite $lookup localField/foreignField stages to execute with pipeline/let&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29376&quot;&gt;&lt;del&gt;SERVER-29376&lt;/del&gt;&lt;/a&gt; and instead allowing combination of both, localField and foreignField and expressive pipeline.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$lookup:{from:&quot;other&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&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;                localField:&quot;l&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&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;                foreignField:&quot;f&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;                as:&quot;fromOther&quot;&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;                [, pipeline: [ ... ] ]  /* optionally add a pipeline to apply *after* equality join */&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This allows preserving the non-expressive lookup equality semantics with additional flexibility of using anything along with it like $sort and $limit etc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="542070">SERVER-34927</key>
            <summary>allow localField and foreignField with more expressive $lookup pipeline</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>asya</label>
                            <label>qopt-team</label>
                    </labels>
                <created>Thu, 10 May 2018 14:22:04 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:55 +0000</updated>
                            <resolved>Fri, 8 Jan 2021 14:10:41 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3556497" author="ian@10gen.com" created="Sat, 9 Jan 2021 18:12:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;evrg-bot-webhook&apos;, &apos;name&apos;: u&apos;Hana Pearlman&apos;, &apos;email&apos;: u&apos;hana.pearlman@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34927&quot; title=&quot;allow localField and foreignField with more expressive $lookup pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34927&quot;&gt;&lt;del&gt;SERVER-34927&lt;/del&gt;&lt;/a&gt;: allow localField and foreignField with more expressive $lookup pipeline&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3fadec4ccd5abc2b29ebdba1a269766eb2a4e256&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3fadec4ccd5abc2b29ebdba1a269766eb2a4e256&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1423209">SERVER-49953</issuekey>
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            <issuekey id="1072064">SERVER-45326</issuekey>
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            <issuekey id="387018">SERVER-29376</issuekey>
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            <issuelink>
            <issuekey id="724152">SERVER-40362</issuekey>
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            <issuelink>
            <issuekey id="769655">SERVER-41171</issuekey>
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                            <customfieldvalue>Previously, to determine the matching documents from the joined collection, $lookup accepted either the localField and foreignField arguments to perform an equality match or a pipeline to apply to the joined collection. After this change, the localField/foreignField arguments and the pipeline/let arguments can be used together when specifying a $lookup. For examples, see the syntax doc in WRITING-7251.&lt;br/&gt;
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