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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-41922] Explain on $lookup (&quot;let and pipeline&quot; form) throws</title>
                <link>https://jira.mongodb.org/browse/SERVER-41922</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I try to get plan of my aggregation including complex lookup to figure out could it utilize index of joined collection or not.&lt;/p&gt;

&lt;p&gt;End even with simplified example (in selfdescribing repro) I get error &quot;Expected &apos;pipeline&apos; to be BSON docs (or equivalent), but got []interface {} instead.&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="814576">SERVER-41922</key>
            <summary>Explain on $lookup (&quot;let and pipeline&quot; form) throws</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="eric.sedor@mongodb.com">Eric Sedor</assignee>
                                    <reporter username="serggladskikh@yandex.ru">Segey Gladskikh</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Jun 2019 22:00:28 +0000</created>
                <updated>Fri, 7 Apr 2023 15:48:48 +0000</updated>
                            <resolved>Fri, 28 Jun 2019 21:08:35 +0000</resolved>
                                    <version>4.0.10</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2305450" author="eric.sedor" created="Fri, 28 Jun 2019 21:08:22 +0000"  >&lt;p&gt;This looks to be because the argument to &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aggregate&lt;/a&gt; is a string instead of an array.&lt;/p&gt;

&lt;p&gt;The SERVER project is for bugs and feature suggestions for the MongoDB server. As this ticket does not appear to a bug, I will now close it. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;db.getCollection(&quot;threads&quot;).explain().aggregate(&quot;&apos;$lookup&apos;: { &apos;from&apos;: &apos;posts&apos;, &apos;let&apos;: &lt;/p&gt;
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&lt;p&gt;, &apos;pipeline&apos;: [ { &apos;$match&apos;: { &apos;$expr&apos;: &lt;/p&gt;
{ &apos;$in&apos;: [ &apos;$_id&apos;
 &apos;$$postsIds&apos; ] }
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