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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-27644] distinct on a view doesn&apos;t &quot;flatten&quot; array members</title>
                <link>https://jira.mongodb.org/browse/SERVER-27644</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you create an identity view on a collection which has some field that contains an array, the result of db.collection.distinct(&quot;thatfield&quot;) and db.identityview.distinct(&quot;thatfield&quot;) will not be the same.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;{ &quot;_id&quot; : ObjectId(&quot;5876aaf734e6e16cd498d61e&quot;), &quot;a&quot; : [ 3, 4 ] }&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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.coll.distinct(&quot;a&quot;)&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[ 1, 2, 3, 4 ]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="344589">SERVER-27644</key>
            <summary>distinct on a view doesn&apos;t &quot;flatten&quot; array members</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Wed, 11 Jan 2017 22:01:39 +0000</created>
                <updated>Tue, 16 Mar 2021 16:34:22 +0000</updated>
                            <resolved>Tue, 7 Feb 2017 21:11:51 +0000</resolved>
                                    <version>3.4.1</version>
                    <version>3.5.1</version>
                                    <fixVersion>3.4.4</fixVersion>
                    <fixVersion>3.5.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1549876" author="xgen-internal-githook" created="Fri, 14 Apr 2017 21:15:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27644&quot; title=&quot;distinct on a view doesn&amp;#39;t &amp;quot;flatten&amp;quot; array members&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27644&quot;&gt;&lt;del&gt;SERVER-27644&lt;/del&gt;&lt;/a&gt; $unwind arrays when performing distinct on a view&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3ed956d8813b7b56c2319456c28838dfa6c5c20b)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
    src/mongo/db/query/parsed_distinct_test.cpp&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb73656e7d384ae22d4a615af0cba8bc865b2bff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb73656e7d384ae22d4a615af0cba8bc865b2bff&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1494342" author="xgen-internal-githook" created="Tue, 7 Feb 2017 21:10:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27644&quot; title=&quot;distinct on a view doesn&amp;#39;t &amp;quot;flatten&amp;quot; array members&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27644&quot;&gt;&lt;del&gt;SERVER-27644&lt;/del&gt;&lt;/a&gt; $unwind arrays when performing distinct on a view&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3ed956d8813b7b56c2319456c28838dfa6c5c20b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3ed956d8813b7b56c2319456c28838dfa6c5c20b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1475073" author="kyle.suarez" created="Wed, 11 Jan 2017 22:07:16 +0000"  >&lt;p&gt;A fix for this also needs to update &lt;tt&gt;jstests/core/views/views_distinct.js&lt;/tt&gt; to run tests on documents with more complicated schemas (arrays definitely, and maybe nested objects and nullish values).&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="340278">SERVER-27484</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="1645284">SERVER-55112</issuekey>
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