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            <title>[SERVER-47466] Optimize $push in $group to limit array size if followed by $slice of same field</title>
                <link>https://jira.mongodb.org/browse/SERVER-47466</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If I have a pipeline&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;We can pull in knowledge that only first 5 elements are needed from &quot;a&quot; in $group and stop pushing more elements after we have that many.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1310873">SERVER-47466</key>
            <summary>Optimize $push in $group to limit array size if followed by $slice of same field</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>optimization</label>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 10 Apr 2020 14:08:46 +0000</created>
                <updated>Tue, 6 Dec 2022 02:30:05 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4088300" author="JIRAUSER1258464" created="Tue, 28 Sep 2021 04:59:50 +0000"  >&lt;p&gt;Is there any workaround, to satisfy this use case?&lt;br/&gt;
 wanted to restrict the size of group member elements in each group.&lt;br/&gt;
the current solution required me to bring every group member in memory which might cross the hard limit of 100 MB.&lt;/p&gt;</comment>
                            <comment id="3034772" author="asya" created="Fri, 10 Apr 2020 14:10:06 +0000"  >&lt;p&gt;if there are no other accumulators in $group we can even shortcircuit processing the stage once we have enough to satisfy slice.&lt;/p&gt;</comment>
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