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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-62988] Investigate avoiding an extra document fetch on bounded collection scans</title>
                <link>https://jira.mongodb.org/browse/SERVER-62988</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Cluster key lookups fetch an extra document, compared to index scans which only (walk the key and) only fetch the documents that match the predicate. The example below respectively fetches 2 documents to return 1 on a bounded collscan for a clustered collection, and walks 1 key to fetch 1 document and return 1 document on an index scan for a non-clustered collection.&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;// Clustered collection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;{&quot;command&quot;:{&quot;find&quot;:&quot;c&quot;,&quot;filter&quot;:{&quot;_id&quot;:&quot;a&quot;}},&quot;planSummary&quot;:&quot;COLLSCAN&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;    &quot;keysExamined&quot;:0,&quot;docsExamined&quot;:2,&quot;nreturned&quot;:1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;// Non-clustered collection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;{&quot;command&quot;:{&quot;find&quot;:&quot;c&quot;,&quot;filter&quot;:{&quot;_id&quot;:&quot;a&quot;}},&quot;planSummary&quot;:&quot;IXSCAN { _id: 1 }&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;    &quot;keysExamined&quot;:1,&quot;docsExamined&quot;:1,&quot;nreturned&quot;:1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;While clustered collection queries generally outperform non-clustered collection queries as they avoid the index lookup, we should explore avoiding the extra document fetch as an additional performance improvement.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1971103">SERVER-62988</key>
            <summary>Investigate avoiding an extra document fetch on bounded collection scans</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-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                            <label>clustered_collections</label>
                            <label>time-series</label>
                    </labels>
                <created>Wed, 26 Jan 2022 09:02:13 +0000</created>
                <updated>Tue, 23 Jan 2024 22:48:32 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4984614" author="JIRAUSER1263890" created="Tue, 15 Nov 2022 19:41:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=joe.sack%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;joe.sack@mongodb.com&quot;&gt;joe.sack@mongodb.com&lt;/a&gt; any guidance on the priority of this?&lt;/p&gt;</comment>
                            <comment id="4970804" author="JIRAUSER1257467" created="Thu, 10 Nov 2022 16:00:27 +0000"  >&lt;p&gt;As part of the TS perf work PM-3050, the team also implemented the missing piece for PM-2556: Support clustered collections in multiplanner for all collections - So we are closing PM-2556 and sending this SERVER ticket back to the Triage queue&lt;/p&gt;</comment>
                            <comment id="4488037" author="connie.chen" created="Mon, 18 Apr 2022 14:33:12 +0000"  >&lt;p&gt;Passing this along to Query as there is planned work for 7.0 around clustered collections for the Query Roadmap&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4339456" author="connie.chen" created="Mon, 7 Feb 2022 16:08:05 +0000"  >&lt;p&gt;We should make sure to include Query on the code review for this&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="2082879">SERVER-67786</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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            <issuekey id="2551398">SERVER-85465</issuekey>
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