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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-79373] Do not create a cursor in runAgg() if results can fit in a single batch</title>
                <link>https://jira.mongodb.org/browse/SERVER-79373</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For find queries, a cursor is created if and only if the results don&apos;t fit inside a single batch.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;However, &lt;a href=&quot;https://github.com/10gen/mongo/blob/cff791b689b5012ebd3e9d50128d2f23f3187d73/src/mongo/db/commands/run_aggregate.cpp#L1269-L1273&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;for agg queries it appears a cursor is always created&lt;/a&gt; regardless of whether or not a further batch is required. We should change this for agg to mirror find behavior to not waste an unnecessary cursor.&#160;&lt;/p&gt;

&lt;p&gt;Update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The default batch size is 101 docs or 16MB&lt;/li&gt;
	&lt;li&gt;Walking through &lt;a href=&quot;https://github.com/10gen/mongo/blob/6bca90642592cfa9ef57f852adc472c07e6b3a06/src/mongo/db/commands/run_aggregate.cpp#L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;handleCursorCommand()&lt;/a&gt; could be a good starting point.&lt;/li&gt;
	&lt;li&gt;Walking through &lt;a href=&quot;https://github.com/10gen/mongo/blob/6bca90642592cfa9ef57f852adc472c07e6b3a06/src/mongo/db/commands/find_cmd.cpp#L807&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;how the find command does it&lt;/a&gt; is also a good starting point.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2401663">SERVER-79373</key>
            <summary>Do not create a cursor in runAgg() if results can fit in a single batch</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="13201">Fixed</resolution>
                                        <assignee username="chris.wolff@mongodb.com">Chris Wolff</assignee>
                                    <reporter username="maddie.zechar@mongodb.com">Maddie Zechar</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Jul 2023 16:20:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:24 +0000</updated>
                            <resolved>Tue, 3 Oct 2023 02:11:44 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5747133" author="xgen-internal-githook" created="Tue, 3 Oct 2023 00:37:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Christopher M. Wolff&apos;, &apos;email&apos;: &apos;chris.wolff@mongodb.com&apos;, &apos;username&apos;: &apos;wolffcm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79373&quot; title=&quot;Do not create a cursor in runAgg() if results can fit in a single batch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79373&quot;&gt;&lt;del&gt;SERVER-79373&lt;/del&gt;&lt;/a&gt; Do not create cursor for pipeline when unneeded&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5f80852fcabf21d0dde5769dbc6ac6ee291d521&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5f80852fcabf21d0dde5769dbc6ac6ee291d521&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2337528">SERVER-77013</issuekey>
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