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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-4372] Document distinct()&apos;s behavior when field is an array</title>
                <link>https://jira.mongodb.org/browse/DOCS-4372</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;When there is an array field in the records and a distinct query is performed on that field, the return is not an array of arrays. The behaviour is not documented anywhere and is quite counter-intuitive.&lt;/p&gt;

&lt;p&gt;I would expect an array of arrays. Even if it is not the case there should at least be some documentation about this beahaviour&lt;/p&gt;</description>
                <environment></environment>
        <key id="163722">DOCS-4372</key>
            <summary>Document distinct()&apos;s behavior when field is an array</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="ranjith19">Ranjith Ramachandra</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Oct 2014 12:22:43 +0000</created>
                <updated>Mon, 13 Nov 2023 18:47:01 +0000</updated>
                            <resolved>Fri, 20 Feb 2015 00:22:00 +0000</resolved>
                                                    <fixVersion>v1.3.18</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="833231" author="xgen-internal-githook" created="Fri, 20 Feb 2015 00:21:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4372&quot; title=&quot;Document distinct()&amp;#39;s behavior when field is an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4372&quot;&gt;&lt;del&gt;DOCS-4372&lt;/del&gt;&lt;/a&gt; distinct and array fields&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a74112d69cd960b68e9870714e6db91914fb6c8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a74112d69cd960b68e9870714e6db91914fb6c8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="833230" author="xgen-internal-githook" created="Fri, 20 Feb 2015 00:21:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4372&quot; title=&quot;Document distinct()&amp;#39;s behavior when field is an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4372&quot;&gt;&lt;del&gt;DOCS-4372&lt;/del&gt;&lt;/a&gt; distinct and array fields&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/de6a0f3b51eae724981c61532d37c79c2da4d07e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/de6a0f3b51eae724981c61532d37c79c2da4d07e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="833229" author="xgen-internal-githook" created="Fri, 20 Feb 2015 00:21:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4372&quot; title=&quot;Document distinct()&amp;#39;s behavior when field is an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4372&quot;&gt;&lt;del&gt;DOCS-4372&lt;/del&gt;&lt;/a&gt; distinct and array fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b4212a953e4cfc7512c6fda2f576b856f0b530dc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b4212a953e4cfc7512c6fda2f576b856f0b530dc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="764719" author="ramon.fernandez" created="Fri, 14 Nov 2014 19:37:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ranjith19&quot; class=&quot;user-hover&quot; rel=&quot;ranjith19&quot;&gt;ranjith19&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;when the &lt;tt&gt;distinct()&lt;/tt&gt; field is an array, each element of the array is considered a distinct value. Here&apos;s another example similar to yours that illustrates this behavior:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;&amp;gt; db.foo.insert({a:1, b:[[1,2],[3,4]]})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;&amp;gt; db.foo.insert({a:2, b:[[5,6],[7,8]]})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;&amp;gt; db.foo.distinct(&apos;a&apos;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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 ]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;&amp;gt; db.foo.distinct(&apos;b&apos;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;[ [ 1, 2 ], [ 3, 4 ], [ 5, 6 ], [ 7, 8 ] ]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;You&apos;re right about the documentation part, so I&apos;m moving this ticket to the DOCS project so the documentation can be enhanced.&lt;/p&gt;</comment>
                            <comment id="761968" author="ranjith19" created="Wed, 12 Nov 2014 05:58:49 +0000"  >&lt;p&gt;What is the status on this bug?&lt;/p&gt;</comment>
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