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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-59426] Do not mix collations during change stream rewrites</title>
                <link>https://jira.mongodb.org/browse/SERVER-59426</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;$match&lt;/tt&gt; stages appended to a change stream pipeline can use a custom collation for comparisons, but the oplog scan always uses the simple collation (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31443&quot; title=&quot;$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;). When performing rewrites, we must check whether the pipeline collation is non-simple; if so, we must abandon the attempt to rewrite the filters, since these may be more restrictive than the originals. For instance, {&lt;tt&gt;$match: {&quot;documentKey.field&quot;: &quot;blah&quot;&lt;/tt&gt;}} with a case-insensitive collation should match both &quot;blah&quot; and &quot;BLAH&quot;, but rewriting this into the oplog will only return exact matches on &quot;blah&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1854377">SERVER-59426</key>
            <summary>Do not mix collations during change stream rewrites</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Aug 2021 18:15:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:25 +0000</updated>
                            <resolved>Mon, 30 Aug 2021 16:32:10 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4106487" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:26:18 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4027838" author="xgen-internal-githook" created="Sat, 28 Aug 2021 04:41:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59426&quot; title=&quot;Do not mix collations during change stream rewrites&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59426&quot;&gt;&lt;del&gt;SERVER-59426&lt;/del&gt;&lt;/a&gt; Do not mix collations during change stream rewrites&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1ef4569aaefdfb19bf0a7dc43d82f2eb3e160ee9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1ef4569aaefdfb19bf0a7dc43d82f2eb3e160ee9&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1870007">SERVER-59840</issuekey>
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            <issuekey id="1862268">SERVER-59660</issuekey>
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