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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-19153] Conditionally push $match before $project</title>
                <link>https://jira.mongodb.org/browse/SERVER-19153</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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="213329">SERVER-19153</key>
            <summary>Conditionally push $match before $project</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="craig.wilson@mongodb.com">Craig Wilson</reporter>
                        <labels>
                            <label>bi-performance</label>
                            <label>optimization</label>
                    </labels>
                <created>Fri, 26 Jun 2015 15:50:08 +0000</created>
                <updated>Tue, 15 May 2018 02:06:17 +0000</updated>
                            <resolved>Thu, 6 Oct 2016 15:27:04 +0000</resolved>
                                                    <fixVersion>3.4.0-rc1</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Performance</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1402046" author="xgen-internal-githook" created="Thu, 6 Oct 2016 15:25:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19153&quot; title=&quot;Conditionally push $match before $project&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19153&quot;&gt;&lt;del&gt;SERVER-19153&lt;/del&gt;&lt;/a&gt; push $match as far forward as possible&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4976eb401b3f16482fb35287ea60d7e8b33fe76d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4976eb401b3f16482fb35287ea60d7e8b33fe76d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1399238" author="david.storch" created="Mon, 3 Oct 2016 20:59:47 +0000"  >&lt;p&gt;I&apos;ve limited the scope of this ticket to be specifically about swapping $match with $project. Swapping $sort and $project is now a separate work item tracked by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26442&quot; title=&quot;Push $sort before $project and $addFields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26442&quot;&gt;SERVER-26442&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1336739" author="charlie.swanson" created="Tue, 26 Jul 2016 21:16:49 +0000"  >&lt;p&gt;Bumping to 3.3 Required to make views more usable.&lt;/p&gt;</comment>
                            <comment id="1149446" author="charlie.swanson" created="Thu, 21 Jan 2016 01:41:55 +0000"  >&lt;p&gt;Yep, this looks like a duplicate. Closing as such. &lt;/p&gt;</comment>
                            <comment id="1149263" author="asya" created="Wed, 20 Jan 2016 22:05:14 +0000"  >&lt;p&gt;Part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4506&quot; title=&quot;aggregation:  optimize by pushing matches to earlier in a pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4506&quot;&gt;&lt;del&gt;SERVER-4506&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="336345">DOCS-9547</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="283465">SERVER-23991</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="26713">SERVER-4506</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="283465">SERVER-23991</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="10279">SERVER-142</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="320662">SERVER-26442</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="323050">SERVER-26598</issuekey>
        </issuelink>
                            </inwardlinks>
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