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            <title>[SERVER-14617] Cardinality Histogram for Query Planner</title>
                <link>https://jira.mongodb.org/browse/SERVER-14617</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Cardinality Histogram for indexes, similar to what a lot of relational databases have. &lt;/p&gt;

&lt;p&gt;This will allow for the query planner to more intelligently decide when it is optimal to use certain indexes over others on a per query basis (Not simply based off a cached value that might be a one off). This will allow for more effective use of index intersection, indexes, and tablescans (where appropriate)&lt;/p&gt;</description>
                <environment></environment>
        <key id="147917">SERVER-14617</key>
            <summary>Cardinality Histogram for Query Planner</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
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                <created>Fri, 18 Jul 2014 20:26:07 +0000</created>
                <updated>Thu, 1 Oct 2015 20:17:24 +0000</updated>
                            <resolved>Thu, 1 Oct 2015 20:17:24 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1049150" author="david.storch" created="Thu, 1 Oct 2015 20:17:01 +0000"  >&lt;p&gt;Resolving as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20619&quot; title=&quot;Statistics-based query optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20619&quot;&gt;SERVER-20619&lt;/a&gt;, since the newer ticket is slightly more general.&lt;/p&gt;</comment>
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