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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-59861] Investigate if/why scans over small string fields are faster than scans over integers</title>
                <link>https://jira.mongodb.org/browse/SERVER-59861</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=timour.katchaounov&quot; class=&quot;user-hover&quot; rel=&quot;timour.katchaounov&quot;&gt;timour.katchaounov&lt;/a&gt; has noticed that for a collection with fields {&lt;tt&gt;f_0, f_1, f_2, f_3, f_4&lt;/tt&gt;}, a collection scan over all the documents is 1.5x - 2x faster when each field is a small string compared to when each field is an integer.&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to investigate this, and if it&apos;s confirmed to be a real performance difference, determine why the integer comparisons are slower. We should test both the classic engine and SBE to determine if the regression is engine-specific, or something more fundamental to the execution system.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1870991">SERVER-59861</key>
            <summary>Investigate if/why scans over small string fields are faster than scans over integers</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="5">Cannot Reproduce</resolution>
                                        <assignee username="bikash.chandra@mongodb.com">Bikash Chandra</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Sep 2021 18:28:53 +0000</created>
                <updated>Wed, 15 Sep 2021 12:38:32 +0000</updated>
                            <resolved>Wed, 15 Sep 2021 12:38:32 +0000</resolved>
                                                                    <component>Query Execution</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4062166" author="JIRAUSER1258247" created="Wed, 15 Sep 2021 11:25:56 +0000"  >&lt;p&gt;I am very sorry for the noise - after all, this turned out to be a mistake in my scripts that generated the test queries. The query in question has had the wrong constant in the comparison condition, which resulted in selecting fewer documents. This was of course faster than selecting all documents.&lt;/p&gt;</comment>
                            <comment id="4058572" author="JIRAUSER1258247" created="Tue, 14 Sep 2021 15:35:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt;&#160;I am investigating this now - it may be the case that this is due to a mistake in my benchmark scripts. These numbers were too strange to make sense. Still not 100% sure, I am running a new version of my benchmark scripts.&lt;/p&gt;</comment>
                            <comment id="4058540" author="kyle.suarez" created="Tue, 14 Sep 2021 15:30:43 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=timour.katchaounov&quot; class=&quot;user-hover&quot; rel=&quot;timour.katchaounov&quot;&gt;timour.katchaounov&lt;/a&gt;, could you please share what scripts you used to run your test so that the QE engineer who picks this up can take those and make a repro?&lt;/p&gt;</comment>
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