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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>[DOCS-7505] Document New Aggregation Optimizations</title>
                <link>https://jira.mongodb.org/browse/DOCS-7505</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;3.4 will introduce a number of new optimizations to the aggregation framework. Currently, the following optimizations have been implemented:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22093&quot; title=&quot;Take advantage of the COUNT_SCAN optimization when a pipeline has no dependencies&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22093&quot;&gt;&lt;del&gt;SERVER-22093&lt;/del&gt;&lt;/a&gt;, which allows aggregation to use a COUNT instead of a collection or index scan if no fields are needed from the resulting document.&lt;/li&gt;
	&lt;li&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;, which allows $group to become non-blocking if the stream of input documents is sorted by the fields used in the _id.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20506&quot; title=&quot;Conditionally order $match with $unwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20506&quot;&gt;&lt;del&gt;SERVER-20506&lt;/del&gt;&lt;/a&gt;, which allows $match after $unwind to move the subset of itself that is not dependent upon the unwound path before the $unwind, resulting in a second $match stage.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="275075">DOCS-7505</key>
            <summary>Document New Aggregation Optimizations</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="benjamin.murphy">Benjamin Murphy</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Mar 2016 15:08:35 +0000</created>
                <updated>Thu, 16 Mar 2023 19:56:29 +0000</updated>
                            <resolved>Thu, 16 Mar 2023 19:56:29 +0000</resolved>
                                                    <fixVersion>3.4.0</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5278906" author="JIRAUSER1264463" created="Thu, 16 Mar 2023 19:56:10 +0000"  >&lt;p&gt;Hi all!&lt;/p&gt;

&lt;p&gt;Closing this out on the grounds that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Details of this request are significantly outdated.&#160;&lt;/li&gt;
	&lt;li&gt;Our documentation has evolved substantially since this request was made.&#160;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Based on this, closing as WON&apos;T DO. Please don&apos;t hesitate to give me a shout or to reopen if you disagree.&lt;/p&gt;</comment>
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