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            <title>[SERVER-2488] MapReduce should have an option to specify field list to take advantage of covered index</title>
                <link>https://jira.mongodb.org/browse/SERVER-2488</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MapReduce should have an option to specify field list to take advantage of covered index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="14545">SERVER-2488</key>
            <summary>MapReduce should have an option to specify field list to take advantage of covered index</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="testn">Testo</reporter>
                        <labels>
                    </labels>
                <created>Sun, 6 Feb 2011 09:54:15 +0000</created>
                <updated>Fri, 18 Feb 2011 13:32:46 +0000</updated>
                            <resolved>Fri, 18 Feb 2011 13:32:46 +0000</resolved>
                                    <version>1.7.5</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="24219" author="eliot" created="Fri, 18 Feb 2011 13:32:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2586&quot; title=&quot;javascript wrapper should support ClientCursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2586&quot;&gt;&lt;del&gt;SERVER-2586&lt;/del&gt;&lt;/a&gt; has the same benefit but is automatic&lt;/p&gt;</comment>
                            <comment id="23211" author="scotthernandez" created="Sun, 6 Feb 2011 22:23:02 +0000"  >&lt;p&gt;Map/Reduce doesn&apos;t work that way. It gets the whole document and isn&apos;t limited by indexes, or the values in them.&lt;/p&gt;

&lt;p&gt;What you are suggesting would cause map/reduce to behave differently when using an index or not. There is no way to know if the map code requires more fields than are in the index, which is used for document selection not population. Also, things like arrays would not work as the index breaks them apart removing dups.&lt;/p&gt;

&lt;p&gt;You might want to watch the new aggregation issue: &lt;a href=&quot;http://jira.mongodb.org/browse/SERVER-447&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;http://jira.mongodb.org/browse/SERVER-447&lt;/a&gt;&lt;/p&gt;</comment>
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