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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-7408] Need to handle $limit differently in sharding if before first $sort or $group</title>
                <link>https://jira.mongodb.org/browse/SERVER-7408</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On a single system the following aggregation can&apos;t return a count &amp;gt; 10:&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;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.foo.aggregate({$limit:10}, {$group: {_id:1, count: {$sum:1}}})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;On a sharded system, this can return a count of 10 * numShards.&lt;/p&gt;

&lt;p&gt;We probably want the limit applied both on the shard (for speedup) and on the mongos (for correctness).&lt;/p&gt;

&lt;p&gt;Luckily, this isn&apos;t likely to affect many users since $limit usually follows a $sort or a $group which both force everything after to run in mongos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="53586">SERVER-7408</key>
            <summary>Need to handle $limit differently in sharding if before first $sort or $group</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Oct 2012 15:41:13 +0000</created>
                <updated>Mon, 11 Jul 2016 17:57:21 +0000</updated>
                            <resolved>Mon, 5 Nov 2012 18:08:34 +0000</resolved>
                                                    <fixVersion>2.2.2</fixVersion>
                    <fixVersion>2.3.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="183299" author="auto" created="Tue, 6 Nov 2012 21:31:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-10-18T21:21:45Z&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7408&quot; title=&quot;Need to handle $limit differently in sharding if before first $sort or $group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7408&quot;&gt;&lt;del&gt;SERVER-7408&lt;/del&gt;&lt;/a&gt; Correctly handle $skip and $limit in sharded agg&lt;/p&gt;

&lt;p&gt;This bug only comes up if the first $skip or $limit precedes the first&lt;br/&gt;
$sort or $limit. This is very rare, but should still be handled&lt;br/&gt;
correctly.&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f4270abac0d8ca752216e11256f93eb176c6ed8c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f4270abac0d8ca752216e11256f93eb176c6ed8c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="182598" author="auto" created="Mon, 5 Nov 2012 18:03:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-10-18T21:21:45Z&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7408&quot; title=&quot;Need to handle $limit differently in sharding if before first $sort or $group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7408&quot;&gt;&lt;del&gt;SERVER-7408&lt;/del&gt;&lt;/a&gt; Correctly handle $skip and $limit in sharded agg&lt;/p&gt;

&lt;p&gt;This bug only comes up if the first $skip or $limit precedes the first&lt;br/&gt;
$sort or $limit. This is very rare, but should still be handled&lt;br/&gt;
correctly.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d8384a53036b471099b8d293ac21b7bd4809df33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d8384a53036b471099b8d293ac21b7bd4809df33&lt;/a&gt;&lt;/p&gt;</comment>
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