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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-31443] $changeStream pipelines should support non-simple collations</title>
                <link>https://jira.mongodb.org/browse/SERVER-31443</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently &lt;tt&gt;$changeStream&lt;/tt&gt; pipelines &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ce87416479155a9cf8e38a0f6b0c6bad194c9cfc/src/mongo/db/pipeline/document_source_change_stream.cpp#L260&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;error when the pipeline collation is non-simple&lt;/a&gt;. &lt;tt&gt;$changeStream&lt;/tt&gt; pipelines should support non-simple collations. Comparisons within the &lt;tt&gt;$changeStream&lt;/tt&gt; stage itself should use binary comparison (e.g. comparing namespace string, shard key, &lt;tt&gt;_id&lt;/tt&gt; (comparing &lt;tt&gt;_id&lt;/tt&gt; can also use the collection default collation)), but subsequent stages in the pipeline should use the pipeline collation as usual. This will allow users to do collation-aware comparisons in &lt;tt&gt;$match&lt;/tt&gt; stages in a &lt;tt&gt;$changeStream&lt;/tt&gt; pipeline, which is essential for users using collation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="441741">SERVER-31443</key>
            <summary>$changeStream pipelines should support non-simple collations</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>todo_in_code</label>
                    </labels>
                <created>Fri, 6 Oct 2017 17:47:35 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:00 +0000</updated>
                            <resolved>Fri, 3 Nov 2017 20:43:16 +0000</resolved>
                                                    <fixVersion>3.6.0-rc3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1716938" author="xgen-internal-githook" created="Fri, 3 Nov 2017 20:42:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;username&apos;: &apos;cswanson310&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31443&quot; title=&quot;$changeStream pipelines should support non-simple collations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31443&quot;&gt;&lt;del&gt;SERVER-31443&lt;/del&gt;&lt;/a&gt; Add support for change streams with non-simple collations.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/265fa69f73e083e07c0092d62dc0f5ed54bc9cfe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/265fa69f73e083e07c0092d62dc0f5ed54bc9cfe&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="441730">SERVER-31442</issuekey>
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            <issuelink>
            <issuekey id="441768">SERVER-31447</issuekey>
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