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<item>
            <title>[SERVER-9094] Optimize $or queries to perform like $in if all clauses are on the same field</title>
                <link>https://jira.mongodb.org/browse/SERVER-9094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For performance reasons, you would generally decide to use $in in scenarios where they apply over $or. &lt;/p&gt;

&lt;p&gt;However, some scenarios apply that you would be forced to use a $or in order to add more complex clauses or ranges to your query. For something like find all values of a where a &amp;gt; 10 and a &amp;lt; 20 or a &amp;gt; 30 and a &amp;lt; 50, you would be forced to use a $or query even though the only field being used in the index is a. &lt;/p&gt;

&lt;p&gt;$or should be able to detect when it does not need to run as multiple queries and perhaps handle single field cases like this in a performant way. &lt;/p&gt;</description>
                <environment></environment>
        <key id="69461">SERVER-9094</key>
            <summary>Optimize $or queries to perform like $in if all clauses are on the same field</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="3">Duplicate</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Mar 2013 21:48:41 +0000</created>
                <updated>Thu, 25 Jun 2015 18:40:11 +0000</updated>
                            <resolved>Thu, 29 Jan 2015 18:35:58 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="816718" author="david.storch" created="Thu, 29 Jan 2015 18:35:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12024&quot; title=&quot;re-implement $in in terms of $or&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12024&quot;&gt;SERVER-12024&lt;/a&gt; provides a much more straightforward description of the work involved here. The query optimizer already rewrites an $all to an $and. By the same token, $in should be rewritten to an $or. These two query operators should be syntactic sugar with the same query optimizer semantics. Closing as a duplicate.&lt;/p&gt;</comment>
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