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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-45918] Optimized code path for &quot;simple&quot; sort operations in PlanStage layer</title>
                <link>https://jira.mongodb.org/browse/SERVER-45918</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current implementation of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f61271cd1027ff787efc5b1259a7d20e446ed99/src/mongo/db/exec/sort.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SortStage&lt;/a&gt; is fully general in the sense that it can handle sorting all of the data that can be associated with a &lt;tt&gt;WorkingSetMember&lt;/tt&gt;. This includes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Sorting &lt;tt&gt;WorkingSetMembers&lt;/tt&gt; that represent index keys.&lt;/li&gt;
	&lt;li&gt;Carrying &lt;tt&gt;RecordIds&lt;/tt&gt; alongside the documents being sorted. This is necessary to support findAndModify with a sort. The &lt;tt&gt;RecordId&lt;/tt&gt; is subsequently used by findAndModify to identify the document to update or delete.&lt;/li&gt;
	&lt;li&gt;Carrying metadata alongside the documents being sorted. This could be textScore metadata, geoNear distance metadata, or sortKey metadata, for example.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This all comes with a cost. We can avoid sorting this unnecessary data in many cases, e.g. for sort operations other than findAndModify which don&apos;t involve metadata, and where the data has been fetched. This is done by introducing a new variant of &lt;tt&gt;SortStage&lt;/tt&gt; which sorts simple BSON objects instead of entire &lt;tt&gt;WorkingSetMembers&lt;/tt&gt;. An early prototype of this approach shows significant performance gains on several sort-related benchmarks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1125008">SERVER-45918</key>
            <summary>Optimized code path for &quot;simple&quot; sort operations in PlanStage layer</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, 31 Jan 2020 21:39:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:39 +0000</updated>
                            <resolved>Thu, 13 Feb 2020 03:36:00 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2875590" author="xgen-internal-githook" created="Thu, 13 Feb 2020 03:34:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45918&quot; title=&quot;Optimized code path for &amp;quot;simple&amp;quot; sort operations in PlanStage layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45918&quot;&gt;&lt;del&gt;SERVER-45918&lt;/del&gt;&lt;/a&gt; Add SortStageSimple.&lt;/p&gt;

&lt;p&gt;This new sort implementation can be used in lieu of the&lt;br/&gt;
pre-existing general implementation when certain special&lt;br/&gt;
conditions are met:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The incoming data is fetched.&lt;/li&gt;
	&lt;li&gt;The incoming data has no metadata attached.&lt;/li&gt;
	&lt;li&gt;The record id can be discarded.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3bc79c95c3b355c040395696f30e25574a3079f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3bc79c95c3b355c040395696f30e25574a3079f&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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