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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6571] Replace use of Undefined as missing with EOO in aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-6571</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Undefined is a valid data type and shouldn&apos;t be used for missing values. I know it is used as such in ExpressionFieldPath and ExpressionObject.&lt;/p&gt;

&lt;p&gt;@Matt: could you search for any other uses of Undefined BSONType and see how feasible this is?&lt;/p&gt;</description>
                <environment></environment>
        <key id="45193">SERVER-6571</key>
            <summary>Replace use of Undefined as missing with EOO in aggregation</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Jul 2012 03:06:07 +0000</created>
                <updated>Mon, 11 Jul 2016 17:56:09 +0000</updated>
                            <resolved>Tue, 11 Dec 2012 02:45:11 +0000</resolved>
                                                    <fixVersion>2.3.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="211744" author="redbeard0531" created="Tue, 11 Dec 2012 02:45:11 +0000"  >&lt;p&gt;Undefined is now considered a proper user-defined value to be preserved, different from missing Values.&lt;/p&gt;</comment>
                            <comment id="211640" author="auto" created="Tue, 11 Dec 2012 00:21:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-05T23:55:25Z&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: Normalize handling of Undefined vs EOO/missing in agg&lt;/p&gt;

&lt;p&gt;Related tickets:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6571&quot; title=&quot;Replace use of Undefined as missing with EOO in aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6571&quot;&gt;&lt;del&gt;SERVER-6571&lt;/del&gt;&lt;/a&gt; replace use of Undefined as missing with EOO&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6471&quot; title=&quot;aggregation $min uses Value ordering to compare null and undefined values, does not exclude null and undefined values from consideration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6471&quot;&gt;&lt;del&gt;SERVER-6471&lt;/del&gt;&lt;/a&gt; ignore nullish values in $min and $max accumulators&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6144&quot; title=&quot;Aggregation should error out on divide or mod by zero&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6144&quot;&gt;&lt;del&gt;SERVER-6144&lt;/del&gt;&lt;/a&gt; divide by zero makes field disappear (this solution isn&apos;t final)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/459467c7cf47b57d8990eeb41c65b4e203e15b65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/459467c7cf47b57d8990eeb41c65b4e203e15b65&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="149202" author="redbeard0531" created="Tue, 31 Jul 2012 21:49:19 +0000"  >&lt;p&gt;Bumping to 2.3 since I don&apos;t think this is the best solution, but something similar is needed.&lt;/p&gt;</comment>
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