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    <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>[DOCS-14827] When specifying the &quot;on&quot; field when using $merge, clarify that fields that use a partial index with a unique constraint aren&apos;t allowed</title>
                <link>https://jira.mongodb.org/browse/DOCS-14827</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Currently, when we specify the &quot;on&quot; field using a field that is partially indexed with a unique constraint, we throw an error informing the user that an index isn&apos;t found.&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;errmsg&quot; : &quot;Cannot find index to verify that join fields will be unique&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;} : aggregate failed :&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Our &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a363cc12f1a0b7deb23d51efd9efea2ccf79549/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L139&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;source&lt;/a&gt; indicates that a field that is partially uniquely indexed is insufficient as a unique index.&lt;/p&gt;

&lt;p&gt;It&apos;s not clear in our &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/merge/#std-label-merge-on&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$merge documentation&lt;/a&gt; that a partially indexed field is insufficient for specifying &quot;on&quot; in $merge.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1885679">DOCS-14827</key>
            <summary>When specifying the &quot;on&quot; field when using $merge, clarify that fields that use a partial index with a unique constraint aren&apos;t allowed</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="naomi.pentrel@mongodb.com">Naomi Pentrel</assignee>
                                    <reporter username="edwin.zhou@mongodb.com">Edwin Zhou</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Sep 2021 21:15:47 +0000</created>
                <updated>Mon, 13 Nov 2023 18:46:14 +0000</updated>
                            <resolved>Tue, 12 Oct 2021 15:36:30 +0000</resolved>
                                                    <fixVersion>5.0.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4118705" author="xgen-internal-githook" created="Tue, 12 Oct 2021 14:12:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Naomi Pentrel&apos;, &apos;email&apos;: &apos;5212232+npentrel@users.noreply.github.com&apos;, &apos;username&apos;: &apos;npentrel&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14827&quot; title=&quot;When specifying the &amp;quot;on&amp;quot; field when using $merge, clarify that fields that use a partial index with a unique constraint aren&amp;#39;t allowed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14827&quot;&gt;&lt;del&gt;DOCS-14827&lt;/del&gt;&lt;/a&gt;: $merge and partial indexes&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/62d160ba7525c88b80b599ef2ea46491aa09211c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/62d160ba7525c88b80b599ef2ea46491aa09211c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4118703" author="xgen-internal-githook" created="Tue, 12 Oct 2021 14:12:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Naomi Pentrel&apos;, &apos;email&apos;: &apos;5212232+npentrel@users.noreply.github.com&apos;, &apos;username&apos;: &apos;npentrel&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14827&quot; title=&quot;When specifying the &amp;quot;on&amp;quot; field when using $merge, clarify that fields that use a partial index with a unique constraint aren&amp;#39;t allowed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14827&quot;&gt;&lt;del&gt;DOCS-14827&lt;/del&gt;&lt;/a&gt;: $merge and partial indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b3a5267c950f4879cd53a1b4b742d8e8098419b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b3a5267c950f4879cd53a1b4b742d8e8098419b7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4115425" author="naomi.pentrel" created="Mon, 11 Oct 2021 12:29:57 +0000"  >&lt;p&gt;CR:&#160;&lt;a href=&quot;https://mongodbcr.appspot.com/823440001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/823440001/&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1879519">SERVER-60104</issuekey>
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