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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-44150] MR Agg: Enable tests for output mode &apos;reduce&apos; with a non-trivial reduce function</title>
                <link>https://jira.mongodb.org/browse/SERVER-44150</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43303&quot; title=&quot;Re introduce mapReduce fsm tests in sharded suites&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43303&quot;&gt;&lt;del&gt;SERVER-43303&lt;/del&gt;&lt;/a&gt;, I wasn&apos;t able to enable the map_reduce_reduce.js FSM test since the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/992e55fb42122f718d11b80dbcdce95ce208f109/jstests/concurrency/fsm_workloads/map_reduce_inline.js#L28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reduce function&lt;/a&gt; assumes that each value is an object with a set structure. However, in the translation to agg, we&apos;re building a $merge with a pipeline to run when there is a matching document in the target collection. Until we do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43860&quot; title=&quot;Pipeline style update in $merge can produce unexpected result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43860&quot;&gt;&lt;del&gt;SERVER-43860&lt;/del&gt;&lt;/a&gt; the final reduce will fail since one of the values will be null. &lt;/p&gt;</description>
                <environment></environment>
        <key id="976602">SERVER-44150</key>
            <summary>MR Agg: Enable tests for output mode &apos;reduce&apos; with a non-trivial reduce function</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="13201">Fixed</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Oct 2019 20:01:04 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:53 +0000</updated>
                            <resolved>Tue, 19 Nov 2019 17:26:36 +0000</resolved>
                                                    <fixVersion>4.3.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2549009" author="xgen-internal-githook" created="Tue, 19 Nov 2019 14:49:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;nzolnierzmdb&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;name&apos;: &apos;Nicholas Zolnierz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44150&quot; title=&quot;MR Agg: Enable tests for output mode &amp;#39;reduce&amp;#39; with a non-trivial reduce function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44150&quot;&gt;&lt;del&gt;SERVER-44150&lt;/del&gt;&lt;/a&gt; Enable MR tests for output mode &apos;reduce&apos; with a non-trivial reduce function&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0bed872351365fa35107e0d9818d9066642a84a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0bed872351365fa35107e0d9818d9066642a84a4&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="962566">SERVER-43860</issuekey>
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