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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-12783] MergeSort stage should be limit-aware, rather than adding an explicit limit stage after the sort completes</title>
                <link>https://jira.mongodb.org/browse/SERVER-12783</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The new query system does not implement the optimization described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5063&quot; title=&quot;$in on first compound key element and limit efficiency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5063&quot;&gt;&lt;del&gt;SERVER-5063&lt;/del&gt;&lt;/a&gt;. We should reimplement it for the new query system.&lt;/p&gt;

&lt;p&gt;For example, if you have an $in query and you specify a limit, then the limit can be applied to each element of the $in. Let&apos;s say that you have index {a: 1, b: 1}. The query&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.collection.find({a: {$in: [1, 2]}}).sort({b: 1}).limit(5)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;can be executed by limiting the results from a==1 to 5 and the results from a==2 to 5, sorting on &quot;b&quot; with a merge sort, then reapplying a limit of 5. Currently this query is executed with a mergeSort, but the limits are not applied to the children of the mergeSort.&lt;/p&gt;</description>
                <environment></environment>
        <key id="111941">SERVER-12783</key>
            <summary>MergeSort stage should be limit-aware, rather than adding an explicit limit stage after the sort completes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Feb 2014 16:16:19 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:30 +0000</updated>
                            <resolved>Wed, 19 Mar 2014 17:12:11 +0000</resolved>
                                    <version>2.5.5</version>
                                    <fixVersion>2.6.0-rc2</fixVersion>
                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>2</watches>
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