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            <title>[SERVER-67987] Invalidate $lookup plan cache when foreign collection size decreases</title>
                <link>https://jira.mongodb.org/browse/SERVER-67987</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66935&quot; title=&quot;Invalidate $lookup plan cache when foreign collection size changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66935&quot;&gt;&lt;del&gt;SERVER-66935&lt;/del&gt;&lt;/a&gt; only handles the case when the size of the foreign collection increases. When the execution tree has hash_lookup stage but the foreign collection is no longer eligible for it, we perform replanning and invalidate the existing plan cache entry.&lt;/p&gt;

&lt;p&gt;The case when the foreign collection size decreases and it is again eligible for hahs_lookup is not handled.&lt;/p&gt;</description>
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        <key id="2088416">SERVER-67987</key>
            <summary>Invalidate $lookup plan cache when foreign collection size decreases</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="denis.grebennicov@mongodb.com">Denis Grebennicov</reporter>
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                <created>Tue, 12 Jul 2022 13:03:48 +0000</created>
                <updated>Mon, 5 Dec 2022 23:57:18 +0000</updated>
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