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            <title>[SERVER-1012] Value-less MapReduce (distinct on steroids)</title>
                <link>https://jira.mongodb.org/browse/SERVER-1012</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;ve seen a few people using map reduce just to build a distinct list. It might be more efficient if we supported a key-only MapReduce with a single-argument emit function and no reduce phase. Whatever is emitted would just be put strait into the _id field.&lt;/p&gt;</description>
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        <key id="11773">SERVER-1012</key>
            <summary>Value-less MapReduce (distinct on steroids)</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
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                <created>Tue, 13 Apr 2010 15:13:45 +0000</created>
                <updated>Mon, 29 Aug 2011 16:19:10 +0000</updated>
                            <resolved>Mon, 29 Aug 2011 16:19:10 +0000</resolved>
                                                                    <component>Usability</component>
                                        <votes>3</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="51221" author="eliot" created="Mon, 29 Aug 2011 16:19:10 +0000"  >&lt;p&gt;The other things we have planned probably handle this better.&lt;/p&gt;</comment>
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