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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-20504] Name aggregation operator for lookup: $lookup </title>
                <link>https://jira.mongodb.org/browse/SERVER-20504</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should rename the &lt;tt&gt;$lookUp&lt;/tt&gt; stage to be &lt;tt&gt;$lookup&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="230526">SERVER-20504</key>
            <summary>Name aggregation operator for lookup: $lookup </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="9">Done</resolution>
                                        <assignee username="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="kelly.stirman">Kelly Stirman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Sep 2015 20:00:40 +0000</created>
                <updated>Wed, 28 Oct 2015 04:11:04 +0000</updated>
                            <resolved>Wed, 23 Sep 2015 20:10:29 +0000</resolved>
                                    <version>3.1.8</version>
                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1059517" author="xgen-internal-githook" created="Tue, 13 Oct 2015 20:04:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20504&quot; title=&quot;Name aggregation operator for lookup: $lookup &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20504&quot;&gt;&lt;del&gt;SERVER-20504&lt;/del&gt;&lt;/a&gt; Rename $lookUp stage to $lookup&lt;br/&gt;
Branch: artree&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/748914c1aaf566c0756edda5cb0044c4b138ade2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/748914c1aaf566c0756edda5cb0044c4b138ade2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1041287" author="xgen-internal-githook" created="Wed, 23 Sep 2015 20:10:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20504&quot; title=&quot;Name aggregation operator for lookup: $lookup &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20504&quot;&gt;&lt;del&gt;SERVER-20504&lt;/del&gt;&lt;/a&gt; Rename $lookUp stage to $lookup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/748914c1aaf566c0756edda5cb0044c4b138ade2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/748914c1aaf566c0756edda5cb0044c4b138ade2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1041285" author="xgen-internal-githook" created="Wed, 23 Sep 2015 20:09:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20504&quot; title=&quot;Name aggregation operator for lookup: $lookup &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20504&quot;&gt;&lt;del&gt;SERVER-20504&lt;/del&gt;&lt;/a&gt; Rename $lookUp stage to $lookup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/83c83af10744271230a5bc6939131ad29b5c046c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/83c83af10744271230a5bc6939131ad29b5c046c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1037749" author="schwerin" created="Sun, 20 Sep 2015 18:07:22 +0000"  >&lt;p&gt;I&apos;m fine with all lower case. I just think supporting both is needless hassle.&lt;/p&gt;</comment>
                            <comment id="1037748" author="kelly.stirman@10gen.com" created="Sun, 20 Sep 2015 18:00:53 +0000"  >&lt;p&gt;@schwerin your reasoning for $lookUp seems logical and correct, but it also seems counterintuitive. If we use $lookUp many will mistakenly type $lookup, whereas if we use $lookup I don&apos;t imagine many will reason their way to mistakenly enter $lookUp.&lt;/p&gt;

&lt;p&gt;I do think we should use one in docs and examples - I was thinking the incorrect option could be &quot;autocorrected&quot; in a way, but had not considered outputs like explain and I&apos;m guessing log files too.&lt;/p&gt;

&lt;p&gt;That makes me want to revise the request to be simply that the command should be $lookup instead of $lookUp.&lt;/p&gt;</comment>
                            <comment id="1037312" author="schwerin" created="Fri, 18 Sep 2015 21:12:55 +0000"  >&lt;p&gt;The aggregation operators are all verbs. The verb is &quot;look up&quot;, while &quot;lookup&quot; is a noun. As such, I prefer that we name the operator &quot;$lookUp&quot;. There is certainly precedence to use an all lower-case name for compound verbs that have single-word noun forms. The command &quot;shutdown&quot; should really be named &quot;shutDown&quot; by my reasoning, and it is not.&lt;/p&gt;

&lt;p&gt;I do not think we should support both, however. We should choose one and stick to it. The output of &quot;explain&quot; isn&apos;t going to know which case you supplied, and so it will not match, the documentation should really be consistent anyhow, etc.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="209231">DRIVERS-234</issuekey>
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            <issuekey id="212584">SERVER-19095</issuekey>
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