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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4207] $in queries perform linearly to the length of the input array</title>
                <link>https://jira.mongodb.org/browse/SERVER-4207</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you do a $in or $nin query and give it a large array as input, then for each document that needs to be checked to see if it matches the query, it compares the value in that document for that field to each element in the input array.  It would be much more performant if there was a single check to see if the value in the document is contained in a hash set of the values passed to the $in query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="24481">SERVER-4207</key>
            <summary>$in queries perform linearly to the length of the input array</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Nov 2011 21:29:46 +0000</created>
                <updated>Tue, 6 Dec 2022 05:39:45 +0000</updated>
                                                                            <component>Performance</component>
                    <component>Querying</component>
                                        <votes>5</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="99023" author="eliot" created="Thu, 15 Mar 2012 04:33:56 +0000"  >&lt;p&gt;@remon - can you send an example?&lt;br/&gt;
things aren&apos;t really linear - should be log&amp;#40;n&amp;#41;&lt;/p&gt;</comment>
                            <comment id="96279" author="remonvv" created="Wed, 7 Mar 2012 10:26:40 +0000"  >&lt;p&gt;This issue is becoming a real issue for me. We have to find all kinds of workarounds to avoid the straightforward use-case of large $in queries. The fix sounds pretty trivial. Is there any reason why this isn&apos;t planned to a specific version? What&apos;s &quot;Planning Bucket B&quot;?&lt;/p&gt;</comment>
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