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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84462] Consider offering a way for $toHashedIndexKey expression to apply a collation</title>
                <link>https://jira.mongodb.org/browse/SERVER-84462</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$toHashedIndexKey was added as a public aggregation expression as part of the resharding project by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49214&quot; title=&quot;Add $toHashedIndexKey expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49214&quot;&gt;&lt;del&gt;SERVER-49214&lt;/del&gt;&lt;/a&gt;. Sharded collections are &lt;a href=&quot;https://www.mongodb.com/docs/manual/sharding/#collations-in-sharding&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;always partitioned according to the &quot;simple&quot; collation&lt;/a&gt; independent of the collection&apos;s default collation. Notably, the $toHashedIndexKey expression does &lt;b&gt;not&lt;/b&gt; convert strings in its argument to their equivalent collation key even if the aggregate command is running with a non&amp;#45;&quot;simple&quot; collation. The current behavior must be preserved for the correctness of resharding.&lt;/p&gt;

&lt;p&gt;However, it is possible to have a hashed index with a non&amp;#45;&quot;simple&quot; collation where &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7ff2555e799750d8631cefdb564ba1be4b8745f0/src/mongo/db/index/expression_keys_private.cpp#L663&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CollationIndexKey::collationAwareIndexKeyAppend() is called by ExpressionKeysPrivate::getHashKeys()&lt;/a&gt; to convert strings into their equivalent collation key prior to hashing the collation key. If we believe an application may be using such a hashed index and would want to use $toHashedIndexKey to mimic the hashed index behavior then we should add a way for $toHashedIndexKey to accept a collation. Otherwise this could reasonably wait until support for sharded collections partitioned according to a non&amp;#45;&quot;simple&quot; collation is added (PM-1930).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2534133">SERVER-84462</key>
            <summary>Consider offering a way for $toHashedIndexKey expression to apply a collation</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 Dec 2023 19:57:03 +0000</created>
                <updated>Thu, 18 Jan 2024 15:46:33 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
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            <issuekey id="2491502">SERVER-82815</issuekey>
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            <issuekey id="1396326">SERVER-49214</issuekey>
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