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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-38152] Prune unnecessary branches of the dependency graph in an agg pipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-38152</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When generating pipelines to handle polymorphic data, the BI-Connector creates a lot of fields that are not necessarily needed for the final output, as a simplified example:&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;The code for computing y and z, which can be quite expensive, is totally unneeded.  This can generalize to any number of stages. Essentially, any fields removed by $projects can be removed from computations proceeding said $project, transitively, e.g.:&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$addFields: {x: ..., y:..., z:...}}&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$addFields: {a: {$add: [&quot;$x&quot;, &quot;$y&quot;]}, b: {$add: [&quot;$y&quot;, &quot;$z&quot;]}}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Here, we can remove the computation for a, and then, transitively, x.  This has the possibility to drastically improve many types of queries, but will require a field level dependency tracker. This will see benefit for any generated code, not just from the BI-Connector, so it makes more sense to be done within the server.&lt;/p&gt;</description>
                <environment></environment>
        <key id="634457">SERVER-38152</key>
            <summary>Prune unnecessary branches of the dependency graph in an agg pipeline</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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="patrick.meredith@mongodb.com">Patrick Meredith</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Nov 2018 15:58:58 +0000</created>
                <updated>Fri, 9 Dec 2022 21:08:28 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4843391" author="svilen.mihaylov" created="Tue, 20 Sep 2022 20:54:15 +0000"  >&lt;p&gt;Solved as part of linked ticket for the new optimizer.&lt;/p&gt;</comment>
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            <issuekey id="2127315">SERVER-69361</issuekey>
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