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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40905] Explain should indicate when aggregation pipeline optimizations occur</title>
                <link>https://jira.mongodb.org/browse/SERVER-40905</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The optimizer can perform a &lt;a href=&quot;https://docs.mongodb.com/manual/core/aggregation-pipeline-optimization/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;variety of optimizations&lt;/a&gt; on an aggregation pipeline.&#160; These include reordering of stages as well as&#160;coalescence.&#160; Such modifications allow the database to improve the performance of the pipeline.&#160;&#160;&lt;/p&gt;

&lt;p&gt;To determine if any of these optimizations have happened, a user must be aware of their existence and then compare the &lt;tt&gt;stages&lt;/tt&gt; output from &lt;tt&gt;explain&lt;/tt&gt; with the original pipeline that was submitted.&#160; Explain could help facilitate this process more directly by indicating specific optimizations that were performed.&#160; This could be done via simple boolean flags or could be more complex and list out the transformations individually.&lt;/p&gt;</description>
                <environment></environment>
        <key id="750683">SERVER-40905</key>
            <summary>Explain should indicate when aggregation pipeline optimizations occur</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="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Apr 2019 12:54:12 +0000</created>
                <updated>Tue, 6 Dec 2022 03:00:28 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2231953" author="asya" created="Thu, 2 May 2019 13:12:55 +0000"  >&lt;p&gt;I think &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35069&quot; title=&quot;Explain should include command being explained&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35069&quot;&gt;&lt;del&gt;SERVER-35069&lt;/del&gt;&lt;/a&gt; is related since one of its motivators is to be able to see that executed pipeline differs from input pipeline.&lt;/p&gt;</comment>
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