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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-7327] Using &quot;OR&quot; in a query with ordering results in extremely long (possibly exponential) search times</title>
                <link>https://jira.mongodb.org/browse/SERVER-7327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Issuing a query such as:&lt;/p&gt;

&lt;p&gt;db.events.find({$query : {$or : [{foo : {$in : []}}, {bar : {$in : []}}]}, $orderby : {_id : 1}})&lt;/p&gt;

&lt;p&gt;on a reasonably large table (my events table has 1.2million entries, each using around 6.5k), then the query takes a long time to return (approx 1 minute).&lt;/p&gt;

&lt;p&gt;Reducing the number of OR clauses to one, and it returns immediately.  Extend the number of OR clauses to 3, and it never returns (at least, not that I&apos;ve waited for!)&lt;/p&gt;

&lt;p&gt;Remove the orderby and they all return instantly.&lt;/p&gt;

&lt;p&gt;Note that the documents in my events table has neither a foo or a bar field, so I suspect this is easy to reproduce on any reasonably sized table. &lt;/p&gt;</description>
                <environment>Ubuntu and OSX 10.8</environment>
        <key id="52898">SERVER-7327</key>
            <summary>Using &quot;OR&quot; in a query with ordering results in extremely long (possibly exponential) search times</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="3">Duplicate</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="srstrong">Steve Strong</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Oct 2012 12:08:55 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:45 +0000</updated>
                            <resolved>Thu, 11 Oct 2012 23:04:10 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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                            <comment id="174010" author="aaron" created="Thu, 11 Oct 2012 23:04:10 +0000"  >&lt;p&gt;This is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1205&quot; title=&quot;$or sort does not use index ranges expressed in or clauses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1205&quot;&gt;&lt;del&gt;SERVER-1205&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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