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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-61702] Implement stage rewrite optimizations for $graphLookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-61702</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$graphLookup does not implement many optimizations. We can look at the optimizations for $lookup to see what rewrites can occur since $lookup and $graphLookup have similar behavior. Examples of rewrites that could work are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If we have an internal $unwind that has&#160;preserveNullAndEmpty equal to true, it can swap with $limit&lt;/li&gt;
	&lt;li&gt;If there is no internal unwind, $graphLookup can swap with skip and limit.&lt;/li&gt;
	&lt;li&gt;If we have $graphLookup followed by $sort, and $sort does not use any fields created by $graphLookup, they can swap.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There are likely other optimizations in $lookup that can apply to $graphLookup&lt;/p&gt;</description>
                <environment></environment>
        <key id="1931271">SERVER-61702</key>
            <summary>Implement stage rewrite optimizations for $graphLookup</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="henri.nikku@mongodb.com">Henri Nikku</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 22 Nov 2021 18:19:03 +0000</created>
                <updated>Tue, 5 Jul 2022 10:41:26 +0000</updated>
                            <resolved>Tue, 5 Jul 2022 10:41:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4656659" author="xgen-internal-githook" created="Tue, 5 Jul 2022 10:01:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henri Nikku&apos;, &apos;email&apos;: &apos;henri.nikku@mongodb.com&apos;, &apos;username&apos;: &apos;henrinikku&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61702&quot; title=&quot;Implement stage rewrite optimizations for $graphLookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61702&quot;&gt;&lt;del&gt;SERVER-61702&lt;/del&gt;&lt;/a&gt; Implement stage rewrite optimizations for $graphLookup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/71392af499bde03dae8d25b4407e204869dce5be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/71392af499bde03dae8d25b4407e204869dce5be&lt;/a&gt;&lt;/p&gt;</comment>
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