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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-23322] Add unit tests checking the value of CollatorInterfaceICU::getComparisonKey()</title>
                <link>https://jira.mongodb.org/browse/SERVER-23322</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Existing unit tests ensure that the keys returned from CollatorInterfaceICU::getComparisonKey() have the correct comparison order. However, nowhere do we directly make assertions about the values of the bytes that the comparison key contains. Doing so is important to ensure that we are robust against upgrades of the version of ICU that we link into the server.&lt;/p&gt;

&lt;p&gt;Specifically, imagine that a future version of ICU reformats the comparison keys in an order-preserving way. This may not be a breaking change from ICU&apos;s perspective, since comparison keys will still sort properly with respect to the collator. However, indices constructed using older versions of MongoDB will have materialized the old format of the comparison keys. The newly formatted sort keys may not compare correctly against the persistently stored index keys, essentially resulting in a corrupted index. New unit tests would be useful for building confidence that the collator sort keys are stable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="274667">SERVER-23322</key>
            <summary>Add unit tests checking the value of CollatorInterfaceICU::getComparisonKey()</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Mar 2016 20:25:26 +0000</created>
                <updated>Mon, 6 Jun 2016 21:16:42 +0000</updated>
                            <resolved>Tue, 17 May 2016 21:56:38 +0000</resolved>
                                                    <fixVersion>3.3.8</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1267014" author="xgen-internal-githook" created="Tue, 17 May 2016 21:55:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23322&quot; title=&quot;Add unit tests checking the value of CollatorInterfaceICU::getComparisonKey()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23322&quot;&gt;&lt;del&gt;SERVER-23322&lt;/del&gt;&lt;/a&gt; add basic unit test cases to ensure stability of ICU comparison keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ecd286af8ec44593b54f21610c048f552a6b023d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ecd286af8ec44593b54f21610c048f552a6b023d&lt;/a&gt;&lt;/p&gt;</comment>
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