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    <title>MongoDB Jira</title>
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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-31228] Does changeStream involve documents from different collections?</title>
                <link>https://jira.mongodb.org/browse/SERVER-31228</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/document_source_change_stream.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;document_source_change_stream.h&lt;/a&gt;, getInvolvedNamespaces() has the following comment: &lt;br/&gt;
TODO &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29138&quot; title=&quot;Extend aggregation access control checks to handle $changeNotification access control rules&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29138&quot;&gt;&lt;del&gt;SERVER-29138&lt;/del&gt;&lt;/a&gt;: we need to communicate that this stage will need to look up documents from different collections.&lt;/p&gt;

&lt;p&gt;Should this stage look up documents from different collections or is this an outdated comment?&lt;/p&gt;</description>
                <environment></environment>
        <key id="431130">SERVER-31228</key>
            <summary>Does changeStream involve documents from different collections?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="katherine.walker@mongodb.com">Katherine Walker</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Sep 2017 20:52:06 +0000</created>
                <updated>Mon, 25 Sep 2017 23:03:08 +0000</updated>
                            <resolved>Mon, 25 Sep 2017 23:03:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1681502" author="spencer" created="Mon, 25 Sep 2017 23:02:50 +0000"  >&lt;p&gt;As we worked on changeStreams we realized several things that make supporting a stream from more than just a single collection much trickier than we originally thought, so at this point I think it is increasingly unlikely that we&apos;ll ever support change streams on more than one collection.  We certainly have no plans to do so in the immediate future.&lt;/p&gt;</comment>
                            <comment id="1681038" author="charlie.swanson" created="Mon, 25 Sep 2017 17:06:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=katherine.walker&quot; class=&quot;user-hover&quot; rel=&quot;katherine.walker&quot;&gt;katherine.walker&lt;/a&gt; (in case no one has answered your question yet) it does not today. There are plans to extend the change streams to the database level at some point in the future (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29134&quot; title=&quot;Support returning all change notifications for a database in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29134&quot;&gt;&lt;del&gt;SERVER-29134&lt;/del&gt;&lt;/a&gt;). Since it looks like we&apos;re doing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29138&quot; title=&quot;Extend aggregation access control checks to handle $changeNotification access control rules&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29138&quot;&gt;&lt;del&gt;SERVER-29138&lt;/del&gt;&lt;/a&gt; before we get to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29134&quot; title=&quot;Support returning all change notifications for a database in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29134&quot;&gt;&lt;del&gt;SERVER-29134&lt;/del&gt;&lt;/a&gt;, we should probably just update the comment or remove it entirely.&lt;/p&gt;</comment>
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