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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40056] Remove disabled partial implementation of streaming $group</title>
                <link>https://jira.mongodb.org/browse/SERVER-40056</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have code leftover in the code base from a partial implementation of &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; that was never completed. (The optimization described 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; would improve $group on a sorted input sequence to avoid constructing a hash table.) The streaming $group code is disabled and largely untested, so it has caused confusion and may develop bugs over time. This task for this ticket is to delete any dead code related to streaming $group. This code can be reintroduced in the future if &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; is scheduled for work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="714119">SERVER-40056</key>
            <summary>Remove disabled partial implementation of streaming $group</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="13201">Fixed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 8 Mar 2019 22:44:53 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:06 +0000</updated>
                            <resolved>Mon, 11 Mar 2019 14:24:04 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2176980" author="xgen-internal-githook" created="Mon, 11 Mar 2019 14:23:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40056&quot; title=&quot;Remove disabled partial implementation of streaming $group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40056&quot;&gt;&lt;del&gt;SERVER-40056&lt;/del&gt;&lt;/a&gt; Remove partial implementation of streaming $group.&lt;/p&gt;

&lt;p&gt;The streaming $group optimization was never fully implemented,&lt;br/&gt;
so the code was disabled. This patch removes the dead code, including&lt;br/&gt;
DocumentSource::getOutputSorts().&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0492bf5b77542cbacd73bcfe1e0c999b8078c07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0492bf5b77542cbacd73bcfe1e0c999b8078c07&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="26715">SERVER-4507</issuekey>
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