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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-37779] mongos does not correctly enforce that a change stream must be the first stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-37779</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The $changeStream stage is implemented by parsing as a single stage, but expanding into several internal-only stages for execution. One of those stages (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/834dd2cd077a3d9f5da60d4afba739e9b8d2c72e/src/mongo/db/pipeline/document_source_change_stream.cpp#L117-L128&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DocumentSourceOplogMatch&lt;/tt&gt;&lt;/a&gt;)&#160;is responsible for enforcing that it must be the first stage in the pipeline. &lt;/p&gt;

&lt;p&gt;Unfortunately, there are some cases where we never send a $changeStream to a shard, and so we never create a &lt;tt&gt;DocumentSourceOplogMatch&lt;/tt&gt;, and so it is never enforced that it must be the first stage in the pipeline. For example, the following pipeline should be illegal, but the $changeStream stage stays on mongos, because the $sort stage forces a split in the pipeline and keeps the merging half on mongos:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.sharded_collection.aggregate([{$sort: {x: 1}}, {$changeStream: {}}])&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
</description>
                <environment></environment>
        <key id="625652">SERVER-37779</key>
            <summary>mongos does not correctly enforce that a change stream must be the first stage</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Oct 2018 16:54:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:07 +0000</updated>
                            <resolved>Wed, 7 Nov 2018 14:51:31 +0000</resolved>
                                    <version>4.0.0</version>
                    <version>4.1.4</version>
                                    <fixVersion>4.0.5</fixVersion>
                    <fixVersion>4.1.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2062108" author="xgen-internal-githook" created="Wed, 14 Nov 2018 18:58:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37779&quot; title=&quot;mongos does not correctly enforce that a change stream must be the first stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37779&quot;&gt;&lt;del&gt;SERVER-37779&lt;/del&gt;&lt;/a&gt; Step up enforcement that $changeStream must be first&lt;/p&gt;

&lt;p&gt;Adds an additional check which enforces a $changeStream stage must be&lt;br/&gt;
the first stage in the pipeline which is robust to the case where a&lt;br/&gt;
$changeStream is only ever sent to a mongos.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 505114314a5f4309f2857573db442604cb0e2b26)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4624baffeaab8211af7f8cdef5c08529aa09e9f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4624baffeaab8211af7f8cdef5c08529aa09e9f6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2054459" author="xgen-internal-githook" created="Wed, 7 Nov 2018 14:50:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37779&quot; title=&quot;mongos does not correctly enforce that a change stream must be the first stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37779&quot;&gt;&lt;del&gt;SERVER-37779&lt;/del&gt;&lt;/a&gt; Step up enforcement that $changeStream must be first&lt;/p&gt;

&lt;p&gt;Adds an additional check which enforces a $changeStream stage must be&lt;br/&gt;
the first stage in the pipeline which is robust to the case where a&lt;br/&gt;
$changeStream is only ever sent to a mongos.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/505114314a5f4309f2857573db442604cb0e2b26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/505114314a5f4309f2857573db442604cb0e2b26&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2050237" author="charlie.swanson" created="Fri, 2 Nov 2018 14:51:05 +0000"  >&lt;p&gt;This is through code review, just waiting for 4.0 to unfreeze&lt;/p&gt;</comment>
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