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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-57611] Simplify plans for covered projections with expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-57611</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, SBE plan for query&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;&amp;gt; db.c.createIndex({a:1, b: 1})&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;&amp;gt; db.c.find({a: {$gt: 3}}, {_id: 0, a: 1, c: {$add: [&quot;$a&quot;, &quot;$b&quot;]}}).explain()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Will create an intermediate object, then extract values for fields a and b, compute expression and create final object. We can skip intermediate object and compute expressions directly using slots from index scan. Same strategy is applied for inclusion projections in&#160;&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;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1775619">SERVER-57611</key>
            <summary>Simplify plans for covered projections with expressions</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Thu, 10 Jun 2021 13:55:54 +0000</created>
                <updated>Tue, 6 Dec 2022 01:14:19 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3878628" author="JIRAUSER1257640" created="Tue, 15 Jun 2021 15:04:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ksuarz%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;ksuarz@gmail.com&quot;&gt;ksuarz@gmail.com&lt;/a&gt;&#160;We assigned this to the feature gap project, feel free to reassign if that&apos;s not appropriate.&lt;/p&gt;</comment>
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