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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>[DOCS-8419] 3.2 Aggregation compatibility changes for $unwind</title>
                <link>https://jira.mongodb.org/browse/DOCS-8419</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;In addition to the 3 bullets currently listed in &lt;br/&gt;
&lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.2-compatibility/#aggregation-compatibility-changes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/release-notes/3.2-compatibility/#aggregation-compatibility-changes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Consider adding a fourth bullet around the more forgiving nature of the &lt;tt&gt;$unwind&lt;/tt&gt; stage as now it does not error on non-array operands. It now treats a non-array operand as a single element array.&lt;/p&gt;

&lt;p&gt;It is true this is documented here: &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/unwind/#non-array-field-path&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/aggregation/unwind/#non-array-field-path&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;But it may make sense to collate all of these changes into the compatibility section.&lt;/p&gt;</description>
                <environment></environment>
        <key id="303580">DOCS-8419</key>
            <summary>3.2 Aggregation compatibility changes for $unwind</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="brian.moss@mongodb.com">Brian Moss</assignee>
                                    <reporter username="adam.schwartz@mongodb.com">Adam Schwartz</reporter>
                        <labels>
                    </labels>
                <created>Sun, 24 Jul 2016 14:08:42 +0000</created>
                <updated>Mon, 30 Oct 2023 21:29:52 +0000</updated>
                            <resolved>Mon, 16 Oct 2017 23:15:31 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1699700" author="xgen-internal-githook" created="Mon, 16 Oct 2017 14:43:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kallimachos@gmail.com&apos;, &apos;name&apos;: &apos;Brian Moss&apos;, &apos;username&apos;: &apos;kallimachos&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8419&quot; title=&quot;3.2 Aggregation compatibility changes for $unwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8419&quot;&gt;&lt;del&gt;DOCS-8419&lt;/del&gt;&lt;/a&gt;: Aggregation compatibilty changes for $unwind&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/14fce6806706ffd4e2953ede92fbaa6c5dce7241&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/14fce6806706ffd4e2953ede92fbaa6c5dce7241&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1699698" author="xgen-internal-githook" created="Mon, 16 Oct 2017 14:43:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kallimachos@gmail.com&apos;, &apos;name&apos;: &apos;Brian Moss&apos;, &apos;username&apos;: &apos;kallimachos&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8419&quot; title=&quot;3.2 Aggregation compatibility changes for $unwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8419&quot;&gt;&lt;del&gt;DOCS-8419&lt;/del&gt;&lt;/a&gt;: Aggregation compatibilty changes for $unwind&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/022119bdccc389664dcaba8d1bb53ac9405539c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/022119bdccc389664dcaba8d1bb53ac9405539c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1699697" author="xgen-internal-githook" created="Mon, 16 Oct 2017 14:43:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kallimachos@gmail.com&apos;, &apos;name&apos;: &apos;Brian Moss&apos;, &apos;username&apos;: &apos;kallimachos&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8419&quot; title=&quot;3.2 Aggregation compatibility changes for $unwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8419&quot;&gt;&lt;del&gt;DOCS-8419&lt;/del&gt;&lt;/a&gt;: Aggregation compatibilty changes for $unwind&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c32ee2c0ed882ecbad18254f0c057bf93dc440a3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c32ee2c0ed882ecbad18254f0c057bf93dc440a3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1698002" author="brian.moss" created="Fri, 13 Oct 2017 05:39:05 +0000"  >&lt;p&gt;PR: &lt;a href=&quot;https://github.com/mongodb/docs/pull/3012&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/pull/3012&lt;/a&gt;&lt;/p&gt;</comment>
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