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    <title>MongoDB Jira</title>
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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-46890] Avoid attaching cursor/mergeCursor stage twice in $unionWith explain</title>
                <link>https://jira.mongodb.org/browse/SERVER-46890</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1275773">SERVER-46890</key>
            <summary>Avoid attaching cursor/mergeCursor stage twice in $unionWith explain</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="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="ted.tuckman@mongodb.com">Ted Tuckman</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Mon, 16 Mar 2020 15:16:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:44 +0000</updated>
                            <resolved>Thu, 19 Mar 2020 12:25:51 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2987891" author="xgen-internal-githook" created="Thu, 19 Mar 2020 17:46:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;username&apos;: &apos;TedTuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46890&quot; title=&quot;Avoid attaching cursor/mergeCursor stage twice in $unionWith explain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46890&quot;&gt;&lt;del&gt;SERVER-46890&lt;/del&gt;&lt;/a&gt; Prevent $unionWith explain attaching a cursor source twice.&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 8f33cc286ef975d99f0df2f40a8568a80fa1f3f3)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/027f44f05fc336886c0224707461044aa0c20fb7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/027f44f05fc336886c0224707461044aa0c20fb7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2986765" author="xgen-internal-githook" created="Thu, 19 Mar 2020 12:18:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;username&apos;: &apos;TedTuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46890&quot; title=&quot;Avoid attaching cursor/mergeCursor stage twice in $unionWith explain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46890&quot;&gt;&lt;del&gt;SERVER-46890&lt;/del&gt;&lt;/a&gt; Prevent $unionWith explain attaching a cursor source twice.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8f33cc286ef975d99f0df2f40a8568a80fa1f3f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8f33cc286ef975d99f0df2f40a8568a80fa1f3f3&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;run the following: db.runCommand({explain: {aggregate: &quot;coll&quot;, pipeline: &lt;span class=&quot;error&quot;&gt;&amp;#91;{$unionWith: &amp;quot;coll_2&amp;quot;}&amp;#93;&lt;/span&gt;, cursor: &lt;/p&gt;
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