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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-19546] Prevent $project&apos;s from being sent to shard and merge pipes.</title>
                <link>https://jira.mongodb.org/browse/SERVER-19546</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$project is sent to both the shard and merge pipes when it could be handled exclusively on the shard pipe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="222359">SERVER-19546</key>
            <summary>Prevent $project&apos;s from being sent to shard and merge pipes.</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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="james.cohan">James Cohan</reporter>
                        <labels>
                            <label>optimization</label>
                    </labels>
                <created>Thu, 23 Jul 2015 15:06:48 +0000</created>
                <updated>Tue, 6 Dec 2022 04:47:43 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1182393" author="benjamin.murphy" created="Tue, 23 Feb 2016 21:06:12 +0000"  >&lt;p&gt;Unassigning and moving to backlog. Resolving this ticket is difficult until agg&apos;s dependency tracking is more thorough.&lt;/p&gt;

&lt;p&gt;As initially proposed, a pipeline of the form:&lt;br/&gt;
DocSourceCursor with project (a: 1, b: 1) ----&amp;gt; (other stages) -----&amp;gt; $project (a: 1, b: 1)&lt;br/&gt;
Should have had the second $project removed, provided that (other stages) didn&apos;t include any stages with EXHAUSTIVE_FIELDS dependencies ($group or $project). Similarly, if the last $project on the shard pipe was identical to a project on the merge pipe, it seemed that the one on the merge pipe could be safely removed. However, due to $lookup/other stages, this is difficult:&lt;br/&gt;
DocSourceCursor (a:1, b:1) --&amp;gt; $lookup (results inserted into c) ---&amp;gt; $project (a:1, b:1)&lt;br/&gt;
In this case, the second project cannot be safely removed, because an additional field has been created due to $lookup, but we have no way of identifying that this has happened with our current dependency tracking.&lt;/p&gt;</comment>
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