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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-57556] $_internalUnpackBucket to return single min/max doc</title>
                <link>https://jira.mongodb.org/browse/SERVER-57556</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket is optional for&#160;PM-2330.&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9507&quot; title=&quot;Optimize $sort+$group+$first pipeline to avoid full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9507&quot;&gt;&lt;del&gt;SERVER-9507&lt;/del&gt;&lt;/a&gt;&#160;lets us avoid a full index scan when $group and $first/$last are used together.&#160; PM-2330&#160;extends this optimization to timeseries collections, however it still unpacks the entire bucket containing the first/last data (with&#160;$internalUnpackBucket) and then uses a $sort and $last.&lt;/p&gt;

&lt;p&gt;It would be more efficient to have a bucket access operator that directly returned the document for the min/max timestamp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1773594">SERVER-57556</key>
            <summary>$_internalUnpackBucket to return single min/max doc</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="ruslan.abdulkhalikov@mongodb.com">Ruslan Abdulkhalikov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Jun 2021 23:29:11 +0000</created>
                <updated>Tue, 6 Dec 2022 01:14:47 +0000</updated>
                            <resolved>Tue, 15 Mar 2022 16:07:27 +0000</resolved>
                                                                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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                            <comment id="4413240" author="JIRAUSER1263890" created="Tue, 15 Mar 2022 16:07:27 +0000"  >&lt;p&gt;Actually, I heard that $_internalUnpackBucket with a $sort + $limit:1 will just do a O&lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/thumbs_down.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; time scan, so the work described in this ticket is apparently already done.&lt;/p&gt;</comment>
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