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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-22631] Improve efficiency of matching during an aggregation pipeline.</title>
                <link>https://jira.mongodb.org/browse/SERVER-22631</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s currently very expensive to perform a &lt;tt&gt;$match&lt;/tt&gt; within the aggregation pipeline. This is mostly because the aggregation pipeline works with &lt;tt&gt;Documents&lt;/tt&gt;, which are incompatible with the current &lt;tt&gt;MatchExpression::matchesBSON&lt;/tt&gt; interface, so we have to construct an entirely new &lt;tt&gt;BSONObj&lt;/tt&gt; to match on. There are two things we could do to make this more efficient:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Instead of converting the entire &lt;tt&gt;Document&lt;/tt&gt; to BSON, we could only convert the fields needed by the match. For example, if the match was {&lt;tt&gt;a: {$gte: 4&lt;/tt&gt;}}, we would only need the field &lt;tt&gt;a&lt;/tt&gt; from the document.&lt;/li&gt;
	&lt;li&gt;We could extend the &lt;tt&gt;MatchExpression&lt;/tt&gt; interface to support matching &lt;tt&gt;Documents&lt;/tt&gt;. A &lt;tt&gt;Document&lt;/tt&gt; is logically equivalent to a &lt;tt&gt;BSONObj&lt;/tt&gt;, so it would just be a matter of adapting the matching to use a different API with the object.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="265731">SERVER-22631</key>
            <summary>Improve efficiency of matching during an aggregation pipeline.</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="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>optimization</label>
                    </labels>
                <created>Tue, 16 Feb 2016 16:29:21 +0000</created>
                <updated>Tue, 3 Jan 2017 17:08:21 +0000</updated>
                            <resolved>Wed, 13 Apr 2016 20:11:32 +0000</resolved>
                                                    <fixVersion>3.3.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1431417" author="xgen-internal-githook" created="Thu, 10 Nov 2016 20:10:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;cswanson310@gmail.com&apos;}
&lt;p&gt;Message: PERF-784 Add perf tests for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22631&quot; title=&quot;Improve efficiency of matching during an aggregation pipeline.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22631&quot;&gt;&lt;del&gt;SERVER-22631&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-perf/commit/80570d3f5e3cc12ee8a469e64d025600782448bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-perf/commit/80570d3f5e3cc12ee8a469e64d025600782448bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1431347" author="xgen-internal-githook" created="Thu, 10 Nov 2016 18:59:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;cswanson310@gmail.com&apos;}
&lt;p&gt;Message: PERF-784 Add perf tests for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22631&quot; title=&quot;Improve efficiency of matching during an aggregation pipeline.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22631&quot;&gt;&lt;del&gt;SERVER-22631&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-perf/commit/80570d3f5e3cc12ee8a469e64d025600782448bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-perf/commit/80570d3f5e3cc12ee8a469e64d025600782448bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1235135" author="benjamin.murphy" created="Wed, 13 Apr 2016 20:17:50 +0000"  >&lt;p&gt;Commit 6df76e05dbd86827af7ae9b9676833348537f870 took approach #1. The second approach is still possible, and would likely result in more performance improvements, but would require significantly longer to implement.&lt;/p&gt;</comment>
                            <comment id="1235131" author="xgen-internal-githook" created="Wed, 13 Apr 2016 20:10:45 +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-22631&quot; title=&quot;Improve efficiency of matching during an aggregation pipeline.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22631&quot;&gt;&lt;del&gt;SERVER-22631&lt;/del&gt;&lt;/a&gt; Improve matching efficiency in aggregation.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6df76e05dbd86827af7ae9b9676833348537f870&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6df76e05dbd86827af7ae9b9676833348537f870&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="262213">SERVER-22404</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="334955">SERVER-27213</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="313218">SERVER-25911</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="304496">SERVER-25304</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="262206">SERVER-22402</issuekey>
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