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    <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>[COMPASS-6558] Investigate changes in SERVER-72687: Support for $out to Time-series collections</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6558</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    These changes add a new option (&quot;timeseries&quot;) for the $out aggregation stage. $out will now accept a &quot;timeseries&quot; option that takes in a time-series specification. $out will create a new time-series collection in the specified namespace if an existing collection does not exist in that namespace. If a collection exists in that namespace, $out will do the following: &lt;/p&gt;

&lt;p&gt;1. If the collection is not a time-series collection, $out will error.&lt;br/&gt;
2. If the collection is a time-series collection $out will error if the timeField and the metaField have been changed by the user. The time-series specification inputted in $out must match the existing time-series collection.&lt;br/&gt;
3. If the collection is a time-series collection and matches the specification passed in by the user $out will replace that existing time-series collection with the documents in the aggregation stage.&lt;/p&gt;

&lt;p&gt;These changes are not supported for sharded collections. There is currently follow-up work tracked by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74061&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-74061&lt;/a&gt; currently in progress to add support for secondaries and sharded clusters.&lt;/p&gt;

&lt;p&gt;For more information the syntax doc can be found at this link: &lt;a href=&quot;https://docs.google.com/document/d/15lAB2yQ8e_fR4RnihjsJMotEaIiTe9q_qk-D509DWkM/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/15lAB2yQ8e_fR4RnihjsJMotEaIiTe9q_qk-D509DWkM/edit?usp=sharing&lt;/a&gt; &lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    We should accept the time-series spec in the $out stage and use that to create a time-series collection as part of the &lt;tt&gt;DocumentSourceOut&lt;/tt&gt; stage. This should remove any restriction prohibiting $out from targeting an unsharded time-series collection, and add tests that verify the correct behavior. We don&apos;t need to support sharded time-series collection as part of this ticket.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2274460">COMPASS-6558</key>
            <summary>Investigate changes in SERVER-72687: Support for $out to Time-series collections</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Feb 2023 14:19:08 +0000</created>
                <updated>Tue, 26 Sep 2023 18:11:00 +0000</updated>
                            <resolved>Wed, 8 Mar 2023 16:29:41 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5732303" author="dbeng-pm-bot" created="Tue, 26 Sep 2023 18:11:00 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72687&quot; title=&quot;Support for $out to Time-series collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72687&quot;&gt;&lt;del&gt;SERVER-72687&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
7.1.0-rc0, 7.0.3&lt;/p&gt;</comment>
                            <comment id="5259076" author="rhys.howell" created="Wed, 8 Mar 2023 16:29:42 +0000"  >&lt;p&gt;Created &lt;a href=&quot;https://jira.mongodb.org/browse/COMPASS-6592&quot; title=&quot;Update $out stage operator template to show time series option (and db/col)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;COMPASS-6592&quot;&gt;&lt;del&gt;COMPASS-6592&lt;/del&gt;&lt;/a&gt; to update our $out aggregation template and added to 7.0 epic&lt;/p&gt;</comment>
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