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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-39302] Change streams should always use the simple collation when no explicit collation is provided</title>
                <link>https://jira.mongodb.org/browse/SERVER-39302</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, single-namespace change streams inherit the default collation of the collection for which they are filtering. This makes little sense, given that we are not actually querying documents from that collection; a so-called single-namespace change stream is, in reality, simply a filter on the oplog for that namespace. The current behaviour unintuitively restricts the client&apos;s ability to resume the stream, and is inconsistent with the semantics of whole-db and whole-cluster streams - both of which always use the simple collation unless explicitly provided with an alternative.&lt;/p&gt;

&lt;p&gt;To ensure stability with respect to the change stream&apos;s collation, and to guarantee that we can resume the stream in all circumstances, we should change the behaviour of single-namespace streams to be consistent with whole-db and whole-cluster streams.&lt;/p&gt;</description>
                <environment></environment>
        <key id="680953">SERVER-39302</key>
            <summary>Change streams should always use the simple collation when no explicit collation is provided</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Jan 2019 11:19:15 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:34 +0000</updated>
                            <resolved>Tue, 12 Mar 2019 00:07:18 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2177886" author="xgen-internal-githook" created="Tue, 12 Mar 2019 00:03:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39302&quot; title=&quot;Change streams should always use the simple collation when no explicit collation is provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39302&quot;&gt;&lt;del&gt;SERVER-39302&lt;/del&gt;&lt;/a&gt; Remove all high-water-mark code necessary to support default collation inheritance for single-collection streams&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/43de192f45e15fefed5b5c033feee35848b1f066&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/43de192f45e15fefed5b5c033feee35848b1f066&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2177885" author="xgen-internal-githook" created="Tue, 12 Mar 2019 00:03:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39302&quot; title=&quot;Change streams should always use the simple collation when no explicit collation is provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39302&quot;&gt;&lt;del&gt;SERVER-39302&lt;/del&gt;&lt;/a&gt; Change streams should always use the simple collation when no explicit collation is provided&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4054c2b07cb658a44fc51d145a1688483e18d666&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4054c2b07cb658a44fc51d145a1688483e18d666&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="512742">SERVER-33944</issuekey>
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