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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-21612] Combine post $lookup $match on looked up field</title>
                <link>https://jira.mongodb.org/browse/SERVER-21612</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the scenario where the agg pipeline is:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$lookup:{from:&quot;c2&quot;,localField:&quot;foo&quot;,foreignField:&quot;bar&quot;,as:&quot;c2s&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;   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;{$unwind:&quot;$c2s&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;{$match:{&quot;c2s.f2&quot;:someValue}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;
&lt;p&gt;we should be able to merge the query for f2:someValue into the query into &quot;c2&quot; as find:{bar:&quot;$foo&quot;, f2:someValue} as a performance optimization.&lt;/p&gt;</description>
                <environment></environment>
        <key id="240591">SERVER-21612</key>
            <summary>Combine post $lookup $match on looked up field</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="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="benjamin.murphy">Benjamin Murphy</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>bi-performance</label>
                            <label>optimization</label>
                            <label>performance</label>
                    </labels>
                <created>Sun, 22 Nov 2015 00:11:26 +0000</created>
                <updated>Wed, 4 Nov 2020 18:00:26 +0000</updated>
                            <resolved>Mon, 25 Apr 2016 21:12:25 +0000</resolved>
                                                    <fixVersion>3.3.6</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1418230" author="charlie.swanson" created="Wed, 26 Oct 2016 14:58:14 +0000"  >&lt;p&gt;I&apos;d like to add a note to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benjamin.murphy&quot; class=&quot;user-hover&quot; rel=&quot;benjamin.murphy&quot;&gt;benjamin.murphy&lt;/a&gt;&apos;s comment above:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;2. A $match that consists entirely of predicates upon the &quot;as&quot; field of the $lookup can be moved inside the $lookup and executed as part of the query on the foreign collection.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;There are some caveats here, namely:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;We can only absorb the predicates on the &quot;as&quot; field if the $lookup stage has already absorbed an $unwind. i.e. if the original pipeline had a shape like this:
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[{$lookup: {..., as: &apos;results&apos;}}, {$unwind: &quot;$results&quot;}, {$match: {results.foo: &quot;bar&quot;}}]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I think &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/db/pipeline/document_source_lookup.cpp#L196-L211&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this code comment sums it up well&lt;/a&gt;.&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;We cannot absorb predicates on the &quot;as&quot; field if the $unwind stage is including the array index or if the $unwind stage is preserving null and empty arrays (see the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/unwind/#pipe._S_unwind&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;includeArrayIndex and preserveNullAndEmptyArrays options&lt;/a&gt;). This is similarly described in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/db/pipeline/document_source_lookup.cpp#L213-L222&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the comment following the one above&lt;/a&gt;.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="1246023" author="benjamin.murphy" created="Mon, 25 Apr 2016 21:12:25 +0000"  >&lt;p&gt;This ticket introduces a new optimization to the aggregation pipeline, enabling $lookup to swap with, or absorb, a $match, with the following semantics:&lt;/p&gt;

&lt;p&gt;1. A $match that is entirely independent of the $lookup can be moved before the $lookup.&lt;/p&gt;

&lt;p&gt;2. A $match that consists entirely of predicates upon the &quot;as&quot; field of the $lookup can be moved inside the $lookup and executed as part of the query on the foreign collection.&lt;/p&gt;</comment>
                            <comment id="1246019" author="xgen-internal-githook" created="Mon, 25 Apr 2016 21:10:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benjaminmurphy&apos;, u&apos;name&apos;: u&apos;Benjamin Murphy&apos;, u&apos;email&apos;: u&apos;benjamin_murphy@me.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21612&quot; title=&quot;Combine post $lookup $match on looked up field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21612&quot;&gt;&lt;del&gt;SERVER-21612&lt;/del&gt;&lt;/a&gt; Reorder lookup and match.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3e9149a2db5a6d2e2ecf262340dc052d4dfaaea8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3e9149a2db5a6d2e2ecf262340dc052d4dfaaea8&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="26713">SERVER-4506</issuekey>
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                                        <issuelink>
            <issuekey id="1498499">SERVER-51303</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="393740">SERVER-29618</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="334955">SERVER-27213</issuekey>
        </issuelink>
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