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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-41747] Refactor cluster aggregate planning to only attempt to split the pipeline once</title>
                <link>https://jira.mongodb.org/browse/SERVER-41747</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During development on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5477&quot; title=&quot;when sharded, no need to merge groups if $group _id is the shard key or original document _id&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5477&quot;&gt;SERVER-5477&lt;/a&gt; we noticed that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d0f92cdb0e7d8619ed3fcf10d62e0b2961067c00/src/mongo/db/pipeline/pipeline.cpp#L410&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;Pipeline::requiredToRunOnMongos()&lt;/tt&gt;&lt;/a&gt; emulates much of the logic in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d0f92cdb0e7d8619ed3fcf10d62e0b2961067c00/src/mongo/s/query/cluster_aggregation_planner.h#L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;cluster_aggregation_planner::splitPipeline()&lt;/tt&gt;&lt;/a&gt;. This caused problems when we wanted to add the shard key as a parameter to &lt;tt&gt;distributedPlanLogic()&lt;/tt&gt;, because keeping track of what the shard key is at every stage in the pipeline is non-trivial due to renamed and modified paths at each stage.&#160;&lt;/p&gt;

&lt;p&gt;After staring at this problem for a while, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=george.wangensteen&quot; class=&quot;user-hover&quot; rel=&quot;george.wangensteen&quot;&gt;george.wangensteen&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ted.tuckman&quot; class=&quot;user-hover&quot; rel=&quot;ted.tuckman&quot;&gt;ted.tuckman&lt;/a&gt; and I think the best solution is to do a refactor to push the logic about where the pipeline is required to run down into &lt;tt&gt;cluster_aggregation_planner::splitPipeline()&lt;/tt&gt; and then delete helpers on Pipeline such as &lt;tt&gt;requiredToRunOnMongos()&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="803226">SERVER-41747</key>
            <summary>Refactor cluster aggregate planning to only attempt to split the pipeline once</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="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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Jun 2019 16:22:47 +0000</created>
                <updated>Tue, 6 Dec 2022 02:56:46 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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