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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-67323] Improve dependency handoff between agg and query</title>
                <link>https://jira.mongodb.org/browse/SERVER-67323</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66061&quot; title=&quot;Optimize query plans using columnar indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66061&quot;&gt;&lt;del&gt;SERVER-66061&lt;/del&gt;&lt;/a&gt; we realized that we are doing some crazy stuff where a $group pipeline may generate a dependency set, pass that as a projection into the query layer, and then have the query layer optimize out that projection if/when a $group is pushed into the query layer. This seems sad and inefficient, so we have the following ideas to explore:&lt;br/&gt;
1) Instead of passing dependencies in as a projection, the aggregation system could pass in a new parameter which is the dependencies itself. This would communicate more clearly the intention, and make it possible to only add the projection if we don&apos;t swallow the $group.&lt;br/&gt;
2) Improve the interface for pushing down the $group so that we can know and decide to push a $project and/or a $group around the same time. Right now the $group is sometimes added in a callback function after we have entered the planner&apos;s &lt;tt&gt;getExecutorFind()&lt;/tt&gt;. This makes it sketchy to modify the projection. This could maybe take the form of just always passing a $group into the query system, and letting it decide whether to use SBE to do the $group or to add some shim around DocumentSourceGroup or somehow indicate it was not possible. This may be crazy with library cycles.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2070050">SERVER-67323</key>
            <summary>Improve dependency handoff between agg and query</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Jun 2022 21:35:52 +0000</created>
                <updated>Tue, 24 Jan 2023 18:45:25 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5001837" author="charlie.swanson" created="Tue, 22 Nov 2022 20:29:33 +0000"  >&lt;p&gt;Throwing this back on the backlog as I transition onto another project. Leaving it in the epic in hopes someone on the team can take a look.&lt;/p&gt;</comment>
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