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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-75979] Consider parameterizing the $lookup inner pipeline at the optimization phase, not execution phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-75979</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The more fundamental issue that caused BF-28050 is that we &lt;a href=&quot;https://github.com/10gen/mongo/blob/570350a35559d9a6c2cae02289423b97c5450bdf/src/mongo/db/pipeline/document_source_lookup.cpp#L520&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;repeatedly parse and optimize the $lookup inner pipeline for each input document&lt;/a&gt;, not parameterizing the inner pipeline.&lt;/p&gt;

&lt;p&gt;The classic $lookup would be used in foreseeable future given that the Nebari $lookup (hash lookup) does not support $lookup with inner pipeline and even though the Nebari $lookup supports $lookup with inner pipeline, it may take a while until we can fully switch to Nebari.&lt;/p&gt;

&lt;p&gt;Hope we could address this issue sooner or later.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2311971">SERVER-75979</key>
            <summary>Consider parameterizing the $lookup inner pipeline at the optimization phase, not execution phase</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
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                            <label>query-product-scope-2</label>
                            <label>query-product-urgency-3</label>
                            <label>query-product-value-2</label>
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                <created>Tue, 11 Apr 2023 19:04:41 +0000</created>
                <updated>Fri, 26 May 2023 20:48:49 +0000</updated>
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