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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-63031] Investigate replanning behaviour in cached solution planner</title>
                <link>https://jira.mongodb.org/browse/SERVER-63031</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2155990d7e047de2ca147e1a24bd062554a9ce28/src/mongo/db/query/sbe_cached_solution_planner.cpp#L192&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; logic in SBE cached solution planner which seems suspicious as it&apos;s not quite obvious when a QueryPlanner could produce a single solution during replanning. The thinking is, if we get into the replanning logic, then we know that the cached plan has been picked up from multiple solutions, and since nothing has changed in the catalog meanwhile (otherwise the cached plan would have been invalidated and we would never pass through the cached solution planner) then the QueryPlanner should still produce multiple solutions during replanning.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; suggested that in order to get into you would have to pick up a different view of the catalog in between making the decision to replan and calling&#160;&lt;tt&gt;QueryPlanner::plan()&lt;/tt&gt;&#160;as part of the replanning operation. This seems potentially possible given that we can yield during the cached plan trial period, but a new catalog view could only be available after a write operation which changes a catalog object, so we should be able detect it during plan execution and error out. In any case, we need to verify this hypothesis and if this scenario is impossible replace the aforementioned code block with &lt;tt&gt;MONGO_UNREACHABLE_TASSERT&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1972134">SERVER-63031</key>
            <summary>Investigate replanning behaviour in cached solution planner</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                            <label>new</label>
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                <created>Thu, 27 Jan 2022 11:13:56 +0000</created>
                <updated>Tue, 6 Dec 2022 00:35:46 +0000</updated>
                            <resolved>Thu, 31 Mar 2022 18:05:30 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4342954" author="anton.korshunov" created="Tue, 8 Feb 2022 17:57:07 +0000"  >&lt;p&gt;Sounds good to me, we will look at it if we have some spare time towards the end of the project.&lt;/p&gt;</comment>
                            <comment id="4333329" author="david.storch" created="Thu, 3 Feb 2022 15:34:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; my thinking was that we&apos;d either look into it under the umbrella of this project (even though it&apos;s not strictly part of building the SBE plan cache), or just close it if we run out of time to handle this. I don&apos;t know if it&apos;s important enough to schedule on its own. But I am open to other suggestions.&lt;/p&gt;</comment>
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