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    <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>[DOCS-16447] Investigate changes in SERVER-79582: Remove HostTypeRequirement::kPrimaryShard from $merge</title>
                <link>https://jira.mongodb.org/browse/DOCS-16447</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    When aggregation pipeline is split, there is a new value possible in explain field &quot;mergeType&quot; - &quot;specificShard&quot;.&lt;/p&gt;

&lt;p&gt;When &quot;mergeType&quot; == &quot;specificShard&quot;, a field &quot;mergeShard&quot; is added, containing the shard id of the merging shard.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Use kNone instead of kPrimaryShard. Change distributedPlanLogic() such that we indicate which shard the $merge should execute on in the case that a single shard owns all the data.&lt;/p&gt;

&lt;p&gt;Test cases:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Input and output collections unsharded but reside on two different non-primary shards&lt;/li&gt;
	&lt;li&gt;Input collection sharded, output collection unsharded but not on primary shard&lt;/li&gt;
	&lt;li&gt;Input collection unsharded but not on primary shard, output collection sharded&lt;/li&gt;
	&lt;li&gt;Input and output collections unsharded and input collection is moved during execution. The query should fail with QueryPlanKilled.&lt;/li&gt;
	&lt;li&gt;Input and output collections unsharded and output collection is moved during execution. During execution, update commands should switch over to targeting the inner collection&#8217;s new owner or the query should fail with QueryPlanKilled.&lt;/li&gt;
	&lt;li&gt;Input is not a collection, but $documents, so we should run on the shard that owns output collection (if present)&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="2477364">DOCS-16447</key>
            <summary>Investigate changes in SERVER-79582: Remove HostTypeRequirement::kPrimaryShard from $merge</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="caleb.thompson@mongodb.com">Caleb Thompson</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>request</label>
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                <created>Wed, 18 Oct 2023 09:34:54 +0000</created>
                <updated>Mon, 13 Nov 2023 18:43:09 +0000</updated>
                            <resolved>Fri, 10 Nov 2023 16:40:45 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5865123" author="caleb.thompson" created="Wed, 8 Nov 2023 18:23:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/pull/5251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/pull/5251&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>When aggregation pipeline is split, there is a new value possible in explain field &amp;quot;mergeType&amp;quot; - &amp;quot;specificShard&amp;quot;.&lt;br/&gt;
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When &amp;quot;mergeType&amp;quot; == &amp;quot;specificShard&amp;quot;, a field &amp;quot;mergeShard&amp;quot; is added, containing the shard id of the merging shard.</customfieldvalue>

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