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    <language>en-us</language>    <build-info>
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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-3141] distinct needs to have a way to output to a cursor for large result sets</title>
                <link>https://jira.mongodb.org/browse/SERVER-3141</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For use case please see &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_frm/thread/b9de8d8c90125ddd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_frm/thread/b9de8d8c90125ddd&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The current distinct operation return different from cursor type, the list. The returned list can be large, which creates problem at application level. For example, making pagination become cumbersome, since it requires to fetch the list at every page, rather then using cursor/idx/limit/count operations. The situation get worse in concurrent applications.&lt;/p&gt;</description>
                <environment></environment>
        <key id="17476">SERVER-3141</key>
            <summary>distinct needs to have a way to output to a cursor for large result sets</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="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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="vkuznet">Valentin Kuznetsov</reporter>
                        <labels>
                            <label>query</label>
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                <created>Wed, 25 May 2011 12:03:23 +0000</created>
                <updated>Tue, 6 Dec 2022 05:43:35 +0000</updated>
                            <resolved>Fri, 22 Oct 2021 15:37:22 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>8</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="151260" author="rlaferla" created="Tue, 7 Aug 2012 19:57:22 +0000"  >&lt;p&gt;This doesn&apos;t appear to be working in 2.1.2 nor 2.2.0-rc0.  I really need distinct to return a cursor because I have a large database with 25M records to work with.&lt;/p&gt;</comment>
                            <comment id="62576" author="eliot" created="Tue, 25 Oct 2011 18:43:03 +0000"  >&lt;p&gt;Not at this time.&lt;br/&gt;
The new aggregration framework should be in 2.2, and therefore in 2.1 at some point.&lt;br/&gt;
You can follow &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-447&quot; title=&quot;new aggregation framework&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-447&quot;&gt;&lt;del&gt;SERVER-447&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="62573" author="zacwitte" created="Tue, 25 Oct 2011 18:40:04 +0000"  >&lt;p&gt;@Eliot, have any update for us? This would be hugely useful.&lt;/p&gt;</comment>
                            <comment id="34501" author="eliot" created="Thu, 26 May 2011 05:59:13 +0000"  >&lt;p&gt;This may be handled by the new aggregation framework&lt;/p&gt;</comment>
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