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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-23318] Streaming $group does not handle nullish values correctly.</title>
                <link>https://jira.mongodb.org/browse/SERVER-23318</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4507&quot; title=&quot;aggregation:  optimize $group to take advantage of sorted sequences&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4507&quot;&gt;SERVER-4507&lt;/a&gt; was implemented and pushed, but has a known issue:&lt;/p&gt;

&lt;p&gt;Because of how the index sorts null, missing, and undefined values, a user executing a $group on documents with null/missing/undefined values may get the incorrect number of groups.&lt;/p&gt;

&lt;p&gt;To fix this, $group should not stream for the period that input has nullish _id values.&lt;/p&gt;

&lt;p&gt;Once this change has gone into master, DocumentSourceGroup::findRelevantInputSort should be changed to not immediately return boost::none, and the associated tests in document_source_test.cpp should be reenabled by removing the #if surrounding the lines that add the tests to the suite.&lt;/p&gt;</description>
                <environment></environment>
        <key id="274652">SERVER-23318</key>
            <summary>Streaming $group does not handle nullish values correctly.</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="benjamin.murphy">Benjamin Murphy</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Mar 2016 19:22:55 +0000</created>
                <updated>Sat, 30 Dec 2023 19:35:35 +0000</updated>
                            <resolved>Wed, 16 Nov 2016 22:41:50 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1436093" author="david.storch" created="Wed, 16 Nov 2016 22:41:50 +0000"  >&lt;p&gt;I&apos;m closing this issue as Gone Away, since the implementation for streaming group has not been completed. The necessary work is tracked by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4507&quot; title=&quot;aggregation:  optimize $group to take advantage of sorted sequences&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4507&quot;&gt;SERVER-4507&lt;/a&gt;.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="271937">SERVER-23099</issuekey>
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            <issuekey id="244865">SERVER-21992</issuekey>
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            <issuelink>
            <issuekey id="273614">SERVER-23229</issuekey>
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            <issuelink>
            <issuekey id="2534322">SERVER-84466</issuekey>
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            <issuekey id="276820">SERVER-23477</issuekey>
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