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            <title>[SERVER-633] test performance of and optimize $in</title>
                <link>https://jira.mongodb.org/browse/SERVER-633</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="11302">SERVER-633</key>
            <summary>test performance of and optimize $in</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
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                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Feb 2010 16:35:59 +0000</created>
                <updated>Tue, 6 Dec 2022 05:50:50 +0000</updated>
                            <resolved>Fri, 19 May 2017 16:20:04 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>5</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1575542" author="david.storch" created="Fri, 19 May 2017 16:19:55 +0000"  >&lt;p&gt;One thing we would like to do in this area is treat &lt;tt&gt;$or&lt;/tt&gt; and &lt;tt&gt;$in&lt;/tt&gt; identically in the query engine, ensuring that we can create the same quality plans for these logically equivalent operators and that both execute efficiently. However, this ticket is quite general, so we are closing it as &quot;Won&apos;t Fix&quot;. Many improvements and changes to the query engine have been made in the seven years or so since this was filed.&lt;/p&gt;</comment>
                            <comment id="25660" author="tianon" created="Thu, 10 Mar 2011 00:04:49 +0000"  >&lt;p&gt;Does this include optimizing cases of an empty $in list and a list with a single item?  In our testing, $in with an empty list (in a &quot;count&quot; query, no less) was extremely slow.  Does it scan the index whether there&apos;s anything in the list or not?  It seems like it ought to just see the empty list and assume no matches, since you can&apos;t match nothing, no matter how hard you search.&lt;/p&gt;</comment>
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