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    <title>MongoDB Jira</title>
    <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>[SERVER-42957] An empty user-defined collation is ignored for aggregate commands</title>
                <link>https://jira.mongodb.org/browse/SERVER-42957</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When parsing an aggregation request, the user supplied collation is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/aggregation_request.cpp#L115-L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;parsed and stored on the AggregationRequest&lt;/a&gt;. However there is an assumption later in execution that an empty BSONObj for the collation implies that it was never set. For instance, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0609b68b1b841bb46a0ff6ef299f59fac06eb672/src/mongo/db/commands/run_aggregate.cpp#L365&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; when resolving the collator to use for the operation. In this case, we&apos;ll end up incorrectly using the collection-default collation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="903032">SERVER-42957</key>
            <summary>An empty user-defined collation is ignored for aggregate commands</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Aug 2019 19:30:35 +0000</created>
                <updated>Tue, 6 Dec 2022 02:49:53 +0000</updated>
                            <resolved>Thu, 22 Aug 2019 20:57:52 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2382524" author="charlie.swanson" created="Thu, 22 Aug 2019 14:00:28 +0000"  >&lt;p&gt;Best motivation I can see is to avoid developer confusion. Which seems good enough to keep a ticket open on the backlog about. It seems generally confusing and a bad practice to store something optional in a regular BSONObj when many people could without research assume that an empty collation means &quot;binary comparisons&quot; (as I did before looking it up on the most recent code review).&lt;/p&gt;</comment>
                            <comment id="2382411" author="david.storch" created="Thu, 22 Aug 2019 12:56:52 +0000"  >&lt;p&gt;If I understand correctly, this duplicates &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25924&quot; title=&quot;All commands that take a collation parameter should reject the empty document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25924&quot;&gt;SERVER-25924&lt;/a&gt;, which I recently closed as &quot;Won&apos;t Do&quot;. Also, this behavior isn&apos;t specific to &lt;tt&gt;aggregate&lt;/tt&gt;; I think it applies to most (or all?) of the read commands. Is it important to stop treating the empty object to mean the same thing as the absence of the &lt;tt&gt;collation&lt;/tt&gt; argument?&lt;/p&gt;</comment>
                            <comment id="2381601" author="charlie.swanson" created="Wed, 21 Aug 2019 19:45:21 +0000"  >&lt;p&gt;Worth noting that &lt;a href=&quot;https://docs.mongodb.com/manual/reference/collation/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;our docs&lt;/a&gt; mention that the &apos;locale&apos; argument is required, so this should probably be rejected at parse time.&lt;/p&gt;</comment>
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