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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36715] Pushing $sort stage to query system can leave pipeline in an unstitched state</title>
                <link>https://jira.mongodb.org/browse/SERVER-36715</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When preparing a plan executor to be used by an aggregation pipeline, there&apos;s an optimization &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5e461534b339c957d2e6dcf16015949a496a1110/src/mongo/db/pipeline/pipeline_d.cpp#L534&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; that pushes a $sort stage down to the query system. However, this can result in a pipeline that is not correctly stitched since there may be an additional stage after the sort that is now pointing to free&apos;d memory.&lt;/p&gt;</description>
                <environment></environment>
        <key id="589817">SERVER-36715</key>
            <summary>Pushing $sort stage to query system can leave pipeline in an unstitched state</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Aug 2018 13:46:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:53 +0000</updated>
                            <resolved>Mon, 20 Aug 2018 21:10:22 +0000</resolved>
                                    <version>4.0.0</version>
                                    <fixVersion>4.0.2</fixVersion>
                    <fixVersion>4.1.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1980621" author="xgen-internal-githook" created="Mon, 20 Aug 2018 20:31:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36715&quot; title=&quot;Pushing $sort stage to query system can leave pipeline in an unstitched state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36715&quot;&gt;&lt;del&gt;SERVER-36715&lt;/del&gt;&lt;/a&gt;: Pushing $sort stage to query system can leave pipeline in an unstitched state&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6c2523f7d828ca17a7c175bf82a558bd5bfb57fa)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77ab53420058f9fb58e9bba113f6d7e617068c8b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77ab53420058f9fb58e9bba113f6d7e617068c8b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1980361" author="xgen-internal-githook" created="Mon, 20 Aug 2018 16:54:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36715&quot; title=&quot;Pushing $sort stage to query system can leave pipeline in an unstitched state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36715&quot;&gt;&lt;del&gt;SERVER-36715&lt;/del&gt;&lt;/a&gt;: Pushing $sort stage to query system can leave pipeline in an unstitched state&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c2523f7d828ca17a7c175bf82a558bd5bfb57fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c2523f7d828ca17a7c175bf82a558bd5bfb57fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1979343" author="ramon.fernandez" created="Fri, 17 Aug 2018 20:41:29 +0000"  >&lt;p&gt;Thanks for the clarification &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1979317" author="nicholas.zolnierz" created="Fri, 17 Aug 2018 20:31:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ramon.fernandez&quot; class=&quot;user-hover&quot; rel=&quot;ramon.fernandez&quot;&gt;ramon.fernandez&lt;/a&gt; the optimization that I pointed to in the description was really just exposing the bug. The actual regression was introduced in 4.0 from this commit: &lt;a href=&quot;https://github.com/mongodb/mongo/commit/b5a2cc0fec6ac30b1a0196da5feb41d85a8b76c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b5a2cc0fec6ac30b1a0196da5feb41d85a8b76c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1978685" author="david.storch" created="Fri, 17 Aug 2018 14:10:05 +0000"  >&lt;p&gt;Nice work tracking this down, Nick! As discussed in person, we plan to fix this by reintroducing the missing call to Pipeline::optimizePipeline(), which will also be responsible for restitching the Pipeline.&lt;/p&gt;</comment>
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