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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-44749] $lookup option to bypass</title>
                <link>https://jira.mongodb.org/browse/SERVER-44749</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice if there was a way to optionally bypass over a lookup stage based on a value in the document.&lt;/p&gt;

&lt;p&gt;Imagine pipeline of&lt;/p&gt;

&lt;p&gt;A,&lt;br/&gt;
lookup B,&lt;br/&gt;
unwind B,&lt;br/&gt;
lookup C&lt;/p&gt;

&lt;p&gt;Where the relationship is many-to-zero A:B, zero-to-many B:C&lt;/p&gt;

&lt;p&gt;However, if there is no B records found, there is no point to do lookup C. In my scenario, the problem is that because there is no B, then the lookup C attempts to do a match on a null value, and the lookup C collection index is sparse. So the lookup is extremely slow due to no index.&lt;/p&gt;

&lt;p&gt;Could be avoided if there was a way to bypass the lookup based on the current document value.&lt;/p&gt;

&lt;p&gt;Let me know if this is unclear and I can draw up an example.&lt;/p&gt;

&lt;p&gt;Another simpler example might just be A lookup B, where A.value is null, and you don&apos;t want to bother doing a lookup against B since A.value is null.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1016432">SERVER-44749</key>
            <summary>$lookup option to bypass</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="ben@ethika.com">Ben Rotz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Nov 2019 21:26:27 +0000</created>
                <updated>Tue, 6 Dec 2022 02:41:51 +0000</updated>
                                            <version>4.2.1</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2560088" author="carl.champain" created="Thu, 21 Nov 2019 19:02:28 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben%40ethika.com&quot; class=&quot;user-hover&quot; rel=&quot;ben@ethika.com&quot;&gt;ben@ethika.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report.&lt;br/&gt;
I&apos;m passing this ticket along to the Query team for further investigation.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Carl&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
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