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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-24860] Optimize away entire pipeline if it can be answered using a query</title>
                <link>https://jira.mongodb.org/browse/SERVER-24860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;
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					&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;</description>
                <environment></environment>
        <key id="297881">SERVER-24860</key>
            <summary>Optimize away entire pipeline if it can be answered using a query</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="anton.korshunov@mongodb.com">Anton Korshunov</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jun 2016 22:17:06 +0000</created>
                <updated>Tue, 29 Mar 2022 18:24:09 +0000</updated>
                            <resolved>Wed, 3 Apr 2019 12:43:15 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>24</watches>
                                                                                                                <comments>
                            <comment id="2200303" author="xgen-internal-githook" created="Wed, 3 Apr 2019 12:27:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Anton Korshunov&apos;, &apos;username&apos;: &apos;antkorsh&apos;, &apos;email&apos;: &apos;anton.korshunov@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24860&quot; title=&quot;Optimize away entire pipeline if it can be answered using a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24860&quot;&gt;&lt;del&gt;SERVER-24860&lt;/del&gt;&lt;/a&gt; Optimize away entire pipeline if it can be answered using a query&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d47bbc343af0b5bbde7b810f63e6b3404ea9e4d6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d47bbc343af0b5bbde7b810f63e6b3404ea9e4d6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2189265" author="asya" created="Fri, 22 Mar 2019 20:43:49 +0000"  >&lt;p&gt;Yes, that&apos;s fine.&lt;/p&gt;</comment>
                            <comment id="2187139" author="anton.korshunov" created="Thu, 21 Mar 2019 11:20:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;&#160;just want to double check that you&apos;re ok with the proposed name for this boolean flag. Dave and Charlie are fine with the name.&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;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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;optimizedPipeline&quot;&lt;/span&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; : &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="2179748" author="asya" created="Wed, 13 Mar 2019 16:25:27 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; I think the new format is fine, I agree that additional flag with Boolean indicator what happened is nice to have. Especially since sometimes support gets explain output without the command that produced it. &lt;/p&gt;</comment>
                            <comment id="2166648" author="craig.homa" created="Thu, 28 Feb 2019 20:07:35 +0000"  >&lt;p&gt;Removed from the all cursors globally managed epic as this was always more of a &apos;nice to have&apos; and not a goal in the original scope.&lt;/p&gt;</comment>
                            <comment id="1994174" author="kyle.suarez" created="Wed, 5 Sep 2018 18:08:05 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36983&quot; title=&quot;Views are unnecessary slow, even for very simple views&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36983&quot;&gt;&lt;del&gt;SERVER-36983&lt;/del&gt;&lt;/a&gt; for an informal profiling analysis of the overhead of the BSON-Document transformations (and thus the potential performance win we might get by bypassing the aggregation system altogether).&lt;/p&gt;</comment>
                            <comment id="1311356" author="redbeard0531" created="Thu, 30 Jun 2016 22:20:58 +0000"  >&lt;p&gt;This could also handle cases including $skip and $limit, although we&apos;d have to reverse the limit-before-skip optimization before pushing down to the query system because it logically is skip-then-limit (although it has a similar optimization when combined with sorts).&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1048551">SERVER-45069</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="728954">DOCS-12597</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="599477">SERVER-36983</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="770697">PHPLIB-431</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="731335">RUBY-1788</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="55389">SERVER-7568</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="720432">SERVER-40253</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="720454">SERVER-40254</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="722187">SERVER-40323</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="589996">SERVER-36723</issuekey>
        </issuelink>
                            </inwardlinks>
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