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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25954] Support more granular collation specification</title>
                <link>https://jira.mongodb.org/browse/SERVER-25954</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Additional use cases for collation would be enabled if it could be specified at a more granular level than per-operation.  Some examples:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;A compound index or sort criteria with different collations for each key&lt;/li&gt;
	&lt;li&gt;A query filter with different collations per operator&lt;/li&gt;
	&lt;li&gt;An aggregation pipeline with different collations per stage (e.g. a case-insensitive collation for a $match and a case-sensitive one for a subsequent $sort)&lt;/li&gt;
	&lt;li&gt;A read-only view with different collations for the view itself, a view that it depends on, and an operation on the view  (this would be enabled by allowing a collation per aggregation stage)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="313857">SERVER-25954</key>
            <summary>Support more granular collation specification</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="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Fri, 2 Sep 2016 21:07:55 +0000</created>
                <updated>Tue, 26 Dec 2023 17:30:09 +0000</updated>
                                            <version>3.4.0</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="3874371" author="david.percy" created="Fri, 11 Jun 2021 22:02:19 +0000"  >&lt;blockquote&gt;
&lt;p&gt;A read-only view with different collations for the view itself, a view that it depends on, and an operation on the view (this would be enabled by allowing a collation per aggregation stage)&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;
&lt;p&gt;The last bullet seems to enable some security leaks.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Just to clarify, I think this ticket is proposing a way to avoid introducing those security leaks.  We definitely don&apos;t want a view definition to change its meaning based on how you query it.  If we could attach a collation to each stage separately, then a query specifying collation A, running on a view defined with collation B, could all run correctly (each stage using the appropriate collation).&lt;/p&gt;</comment>
                            <comment id="1383670" author="asya" created="Tue, 13 Sep 2016 19:16:35 +0000"  >&lt;p&gt;All of these except the last bullet are reasonable requests.&lt;/p&gt;

&lt;p&gt;The last bullet seems to enable some security leaks.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2525407">SERVER-84198</issuekey>
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            <issuelink>
            <issuekey id="1387347">SERVER-49046</issuekey>
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