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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-65199] replanReason is incorrectly omitted from logs when replanning a query with $group/$lookup pushed down to SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-65199</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a replan occurs, a string field called &quot;replanReason&quot; is supposed to appear in the log and in system.profile. This is broken if there is a $group or $lookup pushed down to SBE.&#160;You can reproduce this with the same repro script that I wrote for related ticket&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65197&quot; title=&quot;Query with $lookup pushed down to SBE can get repeatedly replanned&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65197&quot;&gt;&lt;del&gt;SERVER-65197&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;After some digging, I was able to spot that the problem occurs here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e30ac62b20a58a26087b5eb3c5ebc55da7f15d17/src/mongo/db/query/sbe_multi_planner.cpp#L148-L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/e30ac62b20a58a26087b5eb3c5ebc55da7f15d17/src/mongo/db/query/sbe_multi_planner.cpp#L148-L153&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Imagine that a replan occurs, and the system uses the SBE multi-planner to select a new plan. The &quot;replanReason&quot; string is present in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e30ac62b20a58a26087b5eb3c5ebc55da7f15d17/src/mongo/db/query/sbe_stage_builder.h#L294&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;PlanStageData::replanReason&lt;/tt&gt;&lt;/a&gt;, and each candidate plan has an associated &lt;tt&gt;PlanStageData&lt;/tt&gt; object.&lt;/p&gt;

&lt;p&gt;When a $group or $lookup has been pushed down, the multi-planner selects a plan and then creates an entirely new SBE tree after calling &lt;tt&gt;extendWithAggPipeline()&lt;/tt&gt;. This process currently drops the old &lt;tt&gt;PlanStageData&lt;/tt&gt; object and creates a fresh one. As a result, we discard the value of &quot;replanReason&quot;. When the downstream code responsible for displaying &quot;replanReason&quot; in the logs and profile executes, it finds no value and therefore displays nothing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2014620">SERVER-65199</key>
            <summary>replanReason is incorrectly omitted from logs when replanning a query with $group/$lookup pushed down to SBE</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Apr 2022 21:35:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:07 +0000</updated>
                            <resolved>Thu, 14 Apr 2022 22:27:39 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4484711" author="xgen-internal-githook" created="Thu, 14 Apr 2022 22:18:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65199&quot; title=&quot;replanReason is incorrectly omitted from logs when replanning a query with $group/$lookup pushed down to SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65199&quot;&gt;&lt;del&gt;SERVER-65199&lt;/del&gt;&lt;/a&gt; Pass  through `replanReason` when lowered stages are replanned&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/297809252f48064534ae90189652855bcdda8d3f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/297809252f48064534ae90189652855bcdda8d3f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2014587">SERVER-65197</issuekey>
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