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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-31764] Mongo Aggregation contains $or operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-31764</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;have a collection &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;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;b,&lt;/span&gt;&lt;/pre&gt;
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						&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;c&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;and index on a,b&lt;/p&gt;

&lt;p&gt;found that when aggregation contains $or&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$or:[{&quot;a&quot;:xx},{&quot;b&quot;:xx}]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;is very slow,even both of a and b have index.&lt;/p&gt;

&lt;p&gt;1. when query with &quot;a&quot;,may need 300ms,&lt;br/&gt;
and the result is 3x larger than query with &quot;b&quot;.&lt;br/&gt;
but when query aggregate with&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;$or:[{&quot;a&quot;:xx},{&quot;b&quot;:xx}]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;it need 1.5s &lt;/p&gt;</description>
                <environment></environment>
        <key id="452566">SERVER-31764</key>
            <summary>Mongo Aggregation contains $or operator</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="4">Incomplete</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="cnStoneFang">stone [X]</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Oct 2017 11:36:33 +0000</created>
                <updated>Sun, 7 Jan 2018 04:36:26 +0000</updated>
                            <resolved>Fri, 1 Dec 2017 18:53:12 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1740346" author="mark.agarunov" created="Fri, 1 Dec 2017 18:53:12 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cnStoneFang&quot; class=&quot;user-hover&quot; rel=&quot;cnStoneFang&quot;&gt;cnStoneFang&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1723066" author="mark.agarunov" created="Fri, 10 Nov 2017 21:47:28 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cnStoneFang&quot; class=&quot;user-hover&quot; rel=&quot;cnStoneFang&quot;&gt;cnStoneFang&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We still need additional information to diagnose the problem. If this is still an issue for you, would you please provide the following:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Which version of MongoDB is being used?&lt;/li&gt;
	&lt;li&gt;Please provide the exact query being used,&lt;/li&gt;
	&lt;li&gt;Please append &lt;tt&gt;.explain(true)&lt;/tt&gt; to the query and provide the complete output.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1712732" author="mark.agarunov" created="Mon, 30 Oct 2017 17:57:44 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cnStoneFang&quot; class=&quot;user-hover&quot; rel=&quot;cnStoneFang&quot;&gt;cnStoneFang&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. To get a better idea of what may be causing this behavior, I&apos;d like to request some additional information:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Which version of MongoDB is being used?&lt;/li&gt;
	&lt;li&gt;Please provide the exact query being used,&lt;/li&gt;
	&lt;li&gt;Please append &lt;tt&gt;.explain(true)&lt;/tt&gt; to the query and provide the complete output.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This should give some insight into why the performance is slower with &lt;tt&gt;$or&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
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