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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-54745] Avoid creating intermediate object in covered SBE plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-54745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When an SBE plan is covered, it may &quot;rehydrate&quot; the index key into an object, which is then used in the rest of the plan. In some cases, the rest of the plan can use the &quot;index key slots&quot; (slots storing each component of the index key). This would save us the work of creating a temporary object.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;A good example of this is how &quot;default&quot; projections are implemented. For example, a covered query like:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.c.find({&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;a.c&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}, {&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;a.c&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, _id: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}) &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Using an index {{&lt;/p&gt;
{a.c:1, b: 1}
&lt;p&gt;}} will create a temporary object for each index key. The default projection could instead use the slot storing the &quot;a.c&quot; component directly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1631308">SERVER-54745</key>
            <summary>Avoid creating intermediate object in covered SBE plans</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="nikita.lapkov@mongodb.com">Nikita Lapkov</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>post-rc0</label>
                            <label>sbe-post-rc0</label>
                    </labels>
                <created>Wed, 24 Feb 2021 03:16:00 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:06 +0000</updated>
                            <resolved>Fri, 11 Jun 2021 12:27:09 +0000</resolved>
                                                    <fixVersion>5.0.0-rc2</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3875831" author="xgen-internal-githook" created="Mon, 14 Jun 2021 14:04:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;, &apos;username&apos;: &apos;laplab&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54745&quot; title=&quot;Avoid creating intermediate object in covered SBE plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54745&quot;&gt;&lt;del&gt;SERVER-54745&lt;/del&gt;&lt;/a&gt; Simplify covered projection plans in SBE&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 13d2be97d1ba504057ee2cddd67c13e5bce37aa5)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6907e2428492cb265f03c80158a8217ecc2f4163&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6907e2428492cb265f03c80158a8217ecc2f4163&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3872884" author="xgen-internal-githook" created="Fri, 11 Jun 2021 12:24:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;, &apos;username&apos;: &apos;laplab&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54745&quot; title=&quot;Avoid creating intermediate object in covered SBE plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54745&quot;&gt;&lt;del&gt;SERVER-54745&lt;/del&gt;&lt;/a&gt; Simplify covered projection plans in SBE&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13d2be97d1ba504057ee2cddd67c13e5bce37aa5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/13d2be97d1ba504057ee2cddd67c13e5bce37aa5&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1775619">SERVER-57611</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1773053">SERVER-57533</issuekey>
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