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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55880] Add a flag for failed candidate plans in SBE explain output</title>
                <link>https://jira.mongodb.org/browse/SERVER-55880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the classic engine PlanStage common stats has a &apos;failed&apos; field to indicate that an exception was thrown during the getNext() call. This exception would bubble up to the top of the execution tree causing the &apos;failed&apos; flag to be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/73e0a4048d818987ef6a9d0b95799fdf93bd03f6/src/mongo/db/exec/plan_stage.h#L209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set in every PlanStage&lt;/a&gt; above the one which has raised the exception. Having this flag set on the root stage is used as an indicator that the entire plan has failed. We then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b1a5785e9649d6eff5783b214730286f343087db/src/mongo/db/query/plan_explainer_impl.cpp#L228&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use this flag&lt;/a&gt; in the PlanExplainer to populate the execStats part of explain output.&lt;/p&gt;

&lt;p&gt;However, this mechanism doesn&apos;t exist in SBE and we can only catch an exception in the upstream code in RuntimePlanner and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b1a5785e9649d6eff5783b214730286f343087db/src/mongo/db/query/sbe_runtime_planner.cpp#L77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;store an error Status&lt;/a&gt; object within a CandidatePlan, but only for a specific, recoverable, type of failure. Since we do not store information about a failed candidate plan within the PlanStats object, we cannot output the &apos;failed&apos; flag in explain output&lt;/p&gt;

&lt;p&gt;We need to investigate if reporting this flag is feasible for SBE plans, and what would be involved to implement this functionality.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1673516">SERVER-55880</key>
            <summary>Add a flag for failed candidate plans in SBE explain output</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="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Wed, 7 Apr 2021 18:17:36 +0000</created>
                <updated>Tue, 6 Dec 2022 01:26:42 +0000</updated>
                                                                            <component>Query Execution</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="1644842">SERVER-55094</issuekey>
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