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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13842] Optimize non-simple projections</title>
                <link>https://jira.mongodb.org/browse/SERVER-13842</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Benchmarking work done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13337&quot; title=&quot;Re-enable fast path for _id equality queries with projection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13337&quot;&gt;&lt;del&gt;SERVER-13337&lt;/del&gt;&lt;/a&gt; shows that 2.6 remains slower than 2.4 for queries with non-simple projections such as exclusion projections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="135142">SERVER-13842</key>
            <summary>Optimize non-simple projections</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="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 May 2014 16:48:44 +0000</created>
                <updated>Tue, 6 Dec 2022 05:06:28 +0000</updated>
                                            <version>2.6.1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1066996" author="charlie.swanson" created="Wed, 21 Oct 2015 16:27:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, If I remember correctly, I was only looking at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.0-rc0/src/mongo/db/exec/projection.cpp#L130&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ProjectionStage::transformSimpleInclusion&lt;/a&gt;. I don&apos;t think that there are any more obvious improvements in that method, since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20300&quot; title=&quot;Make StringMap faster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20300&quot;&gt;&lt;del&gt;SERVER-20300&lt;/del&gt;&lt;/a&gt; was resolved. There may be other gains to be had elsewhere, but it would need some investigation.&lt;/p&gt;</comment>
                            <comment id="1066985" author="david.storch" created="Wed, 21 Oct 2015 16:20:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;, I believe you worked on some optimizations to projection in the query system. Did those apply to non-simple projections? Do you think there is further performance work to do on query projections that we should keep in the backlog?&lt;/p&gt;</comment>
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