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    <link>https://jira.mongodb.org</link>
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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-61939] Explore bounding clustered collection scans more tightly</title>
                <link>https://jira.mongodb.org/browse/SERVER-61939</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A range query using an index like&#160;&lt;tt&gt;find({a:{$lte:&quot;yadda&quot;&lt;/tt&gt;)}} generates tight bounds:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;By contrast, a range query by the cluster key like&#160;&lt;tt&gt;find({_id:{$lte:&quot;yadda&quot;&lt;/tt&gt;)}} generates only a single bound:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;This range query can be quite inefficient as it fetches any document of lower &lt;a href=&quot;https://github.com/10gen/mongo/blob/c76f0aecc5adfff499941a60764a89f8bc2f84e1/src/mongo/db/storage/key_string.cpp#L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;data type&lt;/a&gt;, like numeric types.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1943864">SERVER-61939</key>
            <summary>Explore bounding clustered collection scans more tightly</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="13201">Fixed</resolution>
                                        <assignee username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                            <label>PM-2311-M2</label>
                    </labels>
                <created>Tue, 7 Dec 2021 11:05:34 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:16 +0000</updated>
                            <resolved>Tue, 8 Feb 2022 08:24:16 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4340133" author="xgen-internal-githook" created="Mon, 7 Feb 2022 18:50:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel G&#243;mez Ferro&apos;, &apos;email&apos;: &apos;daniel.gomezferro@mongodb.com&apos;, &apos;username&apos;: &apos;dgomezferro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61939&quot; title=&quot;Explore bounding clustered collection scans more tightly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61939&quot;&gt;&lt;del&gt;SERVER-61939&lt;/del&gt;&lt;/a&gt; Tighter bounds for clustered collection scans&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a2d86c376488cc756c0325e6edaf3406a86ec5d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a2d86c376488cc756c0325e6edaf3406a86ec5d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4234845" author="haley.connelly" created="Tue, 7 Dec 2021 16:42:11 +0000"  >&lt;p&gt;&lt;b&gt;Background:&lt;/b&gt; Different BSON types are encoded differently, (and implicitly have values greater than or less than other types. ie) Date type is &lt;a href=&quot;https://github.com/10gen/mongo/blob/c76f0aecc5adfff499941a60764a89f8bc2f84e1/src/mongo/db/storage/key_string.cpp#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;encoded as larger&lt;/a&gt; than numeric type)&lt;/p&gt;

&lt;p&gt;Currently, for TTL deletions, we construct a &lt;a href=&quot;https://github.com/10gen/mongo/blob/c76f0aecc5adfff499941a60764a89f8bc2f84e1/src/mongo/db/ttl.cpp#L466&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;minRecord from the min DateType&lt;/a&gt; for the bounded collection scan. A RecordId helper that generates min/max bounds for each type would be helpful.&lt;/p&gt;</comment>
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