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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-81802] $lookup serializes unresolved sub-pipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-81802</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When working on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81387&quot; title=&quot;Problem re-parsing pipeline with view definitions (for $queryStats)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81387&quot;&gt;&lt;del&gt;SERVER-81387&lt;/del&gt;&lt;/a&gt;, we noticed that $lookup explain returns the sub-pipeline with views unresolved. This is because it captures the original, user-specified pipeline in a &lt;tt&gt;_userPipeline&lt;/tt&gt; field and always returns that. This behavior is inconsistent with other stages such as &lt;tt&gt;$unionWith&lt;/tt&gt;, which return the fully resolved and optimized sub-pipeline for explain. We should consider making it more consistent (allowing for better introspection).&lt;/p&gt;

&lt;p&gt;It appears that we do report optimizations made to the lookup stage in explain output by manually adding on absorbed unwind and match info.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2457383">SERVER-81802</key>
            <summary>$lookup serializes unresolved sub-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="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="alyssa.clark@mongodb.com">Alyssa Clark</reporter>
                        <labels>
                            <label>query-product-scope-2</label>
                            <label>query-product-urgency-2</label>
                            <label>query-product-value-2</label>
                    </labels>
                <created>Tue, 3 Oct 2023 14:55:43 +0000</created>
                <updated>Tue, 31 Oct 2023 13:41:49 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5774350" author="david.storch" created="Thu, 12 Oct 2023 18:13:58 +0000"  >&lt;p&gt;There are some technical questions (including one of feasibility) because we think that the current implementation resolves views and optimizes the inner pipeline once per document from the outer side. Achieving this may require producing a dummy pipeline for the express purpose of displaying the results of view resolution and optimization. Sending to product triage cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris@mongodb.com&quot;&gt;christopher.harris@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
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