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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-63740] Investigate pushing down $lookup stages against a regular collection even if other secondary collections are sharded or are views</title>
                <link>https://jira.mongodb.org/browse/SERVER-63740</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>
&lt;p&gt;Suppose we have an aggregate pipeline consisting of two $lookups, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e23d6707b590ecc0e2e4a40cd8cae62b98cab8a6/jstests/noPassthrough/lookup_pushdown.js#L112-L118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the first of which targets a &#8216;from&#8217; collection that is neither sharded nor a view, but the second of which is a view (or sharded)&lt;/a&gt;. Currently, when the AutoGet for multiple collections is acquired, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e23d6707b590ecc0e2e4a40cd8cae62b98cab8a6/src/mongo/db/db_raii.h#L191-L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the fact that one of the secondary namespaces is sharded/a view will inhibit the pushdown of &lt;em&gt;any&lt;/em&gt; $lookup stages in the front of the pipeline that target regular collections &lt;/a&gt;. This ticket tracks the work to relax this restriction so that any $lookup stage in the front of the pipeline can be pushed down, even if later $lookup stages target views or sharded collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1984872">SERVER-63740</key>
            <summary>Investigate pushing down $lookup stages against a regular collection even if other secondary collections are sharded or are views</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                            <label>post-rc0</label>
                            <label>read-only-views</label>
                    </labels>
                <created>Wed, 16 Feb 2022 18:15:49 +0000</created>
                <updated>Tue, 6 Dec 2022 00:31:22 +0000</updated>
                                                                                                <votes>0</votes>
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