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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>[DOCS-9547] Docs for SERVER-19153: Conditionally push $match before $project</title>
                <link>https://jira.mongodb.org/browse/DOCS-9547</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Engineering Ticket Description:&lt;/p&gt;

&lt;p&gt;I was looking at the &lt;a href=&quot;http://docs.mongodb.org/manual/core/aggregation-pipeline-optimization/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;optimizing aggregation pipelines docs page&lt;/a&gt; and didn&apos;t see this one listed.&lt;/p&gt;

&lt;p&gt;This is only possible if the subsequent $match doesn&apos;t use any computed fields, but there could be a large win with regards to index usage if you could move the $match prior to a $project.&lt;/p&gt;

&lt;p&gt;For example:&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;
		&lt;tbody &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-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;{ $project: { a: 1, b: 1, newField: { $add: [&quot;$a&quot;, &quot;$b&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;{ $match: { a : { $gt: 10 } }&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;is the same as &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;
		&lt;tbody &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-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;{ $match: { a : { $gt: 10 } },&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;{ $project: { a: 1, b: 1, newField: { $add: [&quot;$a&quot;, &quot;$b&quot;] } } }&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;because the $match is only using fields that exist in the original document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="336345">DOCS-9547</key>
            <summary>Docs for SERVER-19153: Conditionally push $match before $project</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="9">Done</resolution>
                                        <assignee username="nick.larew@mongodb.com">Nicholas Larew</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                            <label>bi-performance</label>
                            <label>optimization</label>
                    </labels>
                <created>Mon, 5 Dec 2016 14:17:59 +0000</created>
                <updated>Fri, 27 Oct 2017 22:08:52 +0000</updated>
                            <resolved>Tue, 24 Oct 2017 19:54:42 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1707929" author="kyle.suarez" created="Tue, 24 Oct 2017 21:01:35 +0000"  >&lt;p&gt;Thanks, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nick.larew&quot; class=&quot;user-hover&quot; rel=&quot;nick.larew&quot;&gt;nick.larew&lt;/a&gt;!&lt;/p&gt;</comment>
                            <comment id="1707908" author="nick.larew" created="Tue, 24 Oct 2017 20:46:43 +0000"  >&lt;p&gt;Hi Kyle,&lt;/p&gt;

&lt;p&gt;There is a PR on the docs repo for this ticket and &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9798&quot; title=&quot;Document that $match can be conditionally pushed before $addFields in an aggregation pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9798&quot;&gt;&lt;del&gt;DOCS-9798&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/pull/3049&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/pull/3049&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1707870" author="kyle.suarez" created="Tue, 24 Oct 2017 20:19:00 +0000"  >&lt;p&gt;Is there a docs commit with the changes?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                            <outwardlinks description="documents">
                                        <issuelink>
            <issuekey id="213329">SERVER-19153</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="347078">DOCS-9798</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="452237">DOCS-10960</issuekey>
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