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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>[SERVER-6131] decide on behavior to $unwind an empty array</title>
                <link>https://jira.mongodb.org/browse/SERVER-6131</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The documentation says $unwind of an empty array passes through the source document unchanged.  There are code comments stating that the behavior is to replace the empty array with a null value when unwinding.  The actual behavior appears to be that the array field is removed from the document.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="41776">SERVER-6131</key>
            <summary>decide on behavior to $unwind an empty array</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="aaron">Aaron Staple</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Jun 2012 20:16:53 +0000</created>
                <updated>Wed, 15 Aug 2012 14:15:04 +0000</updated>
                            <resolved>Fri, 13 Jul 2012 23:56:14 +0000</resolved>
                                                    <fixVersion>2.2.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="142985" author="auto" created="Sat, 14 Jul 2012 12:42:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-13T16:54:37-07:00&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;, u&apos;name&apos;: u&apos;astaple&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6131&quot; title=&quot;decide on behavior to $unwind an empty array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6131&quot;&gt;&lt;del&gt;SERVER-6131&lt;/del&gt;&lt;/a&gt; Describe new behavior when $unwind is applied to missing and empty array values.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/68ef50dbca93df330303e3f3445d119dc0066511&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/68ef50dbca93df330303e3f3445d119dc0066511&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="142942" author="auto" created="Fri, 13 Jul 2012 23:45:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-13T14:57:59-07:00&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;, u&apos;name&apos;: u&apos;Aaron&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6269&quot; title=&quot;DocumentSourceUnwind does not implement the DocumentSource iterator interface correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6269&quot;&gt;&lt;del&gt;SERVER-6269&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6131&quot; title=&quot;decide on behavior to $unwind an empty array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6131&quot;&gt;&lt;del&gt;SERVER-6131&lt;/del&gt;&lt;/a&gt; Reorganize DocumentSourceUnwind so that it iterates properly and omits documents lacking values to unwind.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0da867190d44c77ddf5ffd468c0c0028cd9e653f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0da867190d44c77ddf5ffd468c0c0028cd9e653f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="136955" author="eliot" created="Wed, 27 Jun 2012 08:28:06 +0000"  >&lt;p&gt;array with data - normal&lt;br/&gt;
array with no entries - nothing emitted, nothing in the result&lt;br/&gt;
null or undefined, nothing emitted, nothing in the the result&lt;br/&gt;
something besides a array, null, undefined - uassert&lt;/p&gt;</comment>
                            <comment id="136816" author="aaron" created="Tue, 26 Jun 2012 19:57:47 +0000"  >&lt;p&gt;@eliot - Does your comment above mean if the field is present but not an array (or if it is not present and has a non object parent) then the field should not be present in the result?  Currently we just uassert in these cases.&lt;/p&gt;</comment>
                            <comment id="136791" author="auto" created="Tue, 26 Jun 2012 19:31:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-26T12:29:04-07:00&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;, u&apos;name&apos;: u&apos;astaple&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6131&quot; title=&quot;decide on behavior to $unwind an empty array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6131&quot;&gt;&lt;del&gt;SERVER-6131&lt;/del&gt;&lt;/a&gt; Correct description of behavior when $unwind is applied to an empty array.  (The specified field is dropped from the result.)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/97effea2ffc0082a1af4ae13d254fdabe2ea5aed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/97effea2ffc0082a1af4ae13d254fdabe2ea5aed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="135937" author="eliot" created="Sat, 23 Jun 2012 00:48:10 +0000"  >&lt;p&gt;I actually both of those are wrong.&lt;br/&gt;
WIth no array field or an empty array, it should simply not be in the result.&lt;/p&gt;</comment>
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