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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-12597] Docs for SERVER-24860: Optimize away entire pipeline if it can be answered using a query</title>
                <link>https://jira.mongodb.org/browse/DOCS-12597</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;This following topic needs an update: &lt;a href=&quot;https://docs.mongodb.com/master/reference/explain-results/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/reference/explain-results/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The queryPlanner output may include a new field &apos;optimizedPipeline: true&apos; to indicate that this plan represents an aggregation request where the pipeline has been optimized away and the request is answered using the query engine only. Note that this is either &apos;optimizedPipeline: true&apos;  or no field at all. That is, &apos;optimizedPipeline: false&apos; can never appear in the output. Here is an example:&lt;/p&gt;

&lt;p&gt;&quot;queryPlanner&quot; : {&lt;br/&gt;
   &quot;plannerVersion&quot; : &amp;lt;int&amp;gt;,&lt;br/&gt;
   &quot;namespace&quot; : &amp;lt;string&amp;gt;,&lt;br/&gt;
   &quot;indexFilterSet&quot; : &amp;lt;boolean&amp;gt;,&lt;br/&gt;
   &quot;parsedQuery&quot; : &lt;/p&gt;
&lt;div class=&quot;error&quot;&gt;&lt;span class=&quot;error&quot;&gt;Unknown macro: {
      ...
   }&lt;/span&gt; &lt;/div&gt;
&lt;p&gt;,&lt;br/&gt;
   &quot;queryHash&quot; : &amp;lt;hexadecimal string&amp;gt;,&lt;br/&gt;
   &quot;planCacheKey&quot; : &amp;lt;hexadecimal string&amp;gt;,&lt;br/&gt;
   &quot;optimizedPipeline&quot; : true, &lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;An aggregation pipeline can be used to represent a query, like the following:&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;   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;db.example.aggregate([{$project: {excluded: 0}}, {$match: {predicate: true}}]);&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;In these cases, it would be more efficient to skip the aggregation layer, and execute the entire computation using a query.&lt;/p&gt;

&lt;p&gt;It is expected that pipelines like the above pipeline will be much more common once non-materialized views are introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-142&quot; title=&quot;Read-only views over collection data.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-142&quot;&gt;&lt;del&gt;SERVER-142&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="728954">DOCS-12597</key>
            <summary>Docs for SERVER-24860: Optimize away entire pipeline if it can be answered using a query</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Apr 2019 14:35:50 +0000</created>
                <updated>Mon, 13 Nov 2023 18:23:38 +0000</updated>
                            <resolved>Fri, 9 Aug 2019 14:18:13 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2367382" author="xgen-internal-githook" created="Mon, 12 Aug 2019 18:37:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12597&quot; title=&quot;Docs for SERVER-24860: Optimize away entire pipeline if it can be answered using a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12597&quot;&gt;&lt;del&gt;DOCS-12597&lt;/del&gt;&lt;/a&gt;: 4.2 agg pipeline optimization (pt 2)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e1c517a582bbeca8957550732cac617f2f163eb8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e1c517a582bbeca8957550732cac617f2f163eb8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2364579" author="xgen-internal-githook" created="Fri, 9 Aug 2019 14:17:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12597&quot; title=&quot;Docs for SERVER-24860: Optimize away entire pipeline if it can be answered using a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12597&quot;&gt;&lt;del&gt;DOCS-12597&lt;/del&gt;&lt;/a&gt;: 4.2 agg pipeline optimization&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f534a729a5824424edd46da89862085e8de39836&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f534a729a5824424edd46da89862085e8de39836&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="297881">SERVER-24860</issuekey>
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