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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24401] Allow fast-distinct scan on indexes with non-simple collation</title>
                <link>https://jira.mongodb.org/browse/SERVER-24401</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;tt&gt;getExecutorDistinct()&lt;/tt&gt;, we use the function &lt;tt&gt;turnIxscanIntoDistinctIxscan()&lt;/tt&gt; to convert an IXSCAN into a DISTINCT_SCAN in a &lt;tt&gt;QuerySolution&lt;/tt&gt; where possible. It only applies to solutions with a PROJECTION as the root, and an IXSCAN as its child. This will not apply to indexes with non-simple collation, because there the IXSCAN stage is always followed by a FETCH stage. It should be possible to convert the IXSCAN into a DISTINCT_SCAN for an index with a non-simple collation anywhere that it is possible for an index with a simple collation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="291430">SERVER-24401</key>
            <summary>Allow fast-distinct scan on indexes with non-simple collation</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
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                <created>Fri, 3 Jun 2016 19:29:20 +0000</created>
                <updated>Wed, 3 May 2017 19:12:38 +0000</updated>
                            <resolved>Thu, 18 Aug 2016 22:14:26 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1361528" author="xgen-internal-githook" created="Thu, 18 Aug 2016 21:56:20 +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-24401&quot; title=&quot;Allow fast-distinct scan on indexes with non-simple collation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24401&quot;&gt;&lt;del&gt;SERVER-24401&lt;/del&gt;&lt;/a&gt; allow DISTINCT_SCAN plans over collator comparison keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bc8096859cdd734012d76e4e192f427ac94e48d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bc8096859cdd734012d76e4e192f427ac94e48d7&lt;/a&gt;&lt;/p&gt;</comment>
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