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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-647] M/R: reduce into existing collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-647</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Would basically do a merge, any old _id would just be trampled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="11331">SERVER-647</key>
            <summary>M/R: reduce into existing collection</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Feb 2010 22:07:56 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:27 +0000</updated>
                            <resolved>Mon, 15 Nov 2010 20:12:47 +0000</resolved>
                                                    <fixVersion>1.7.3</fixVersion>
                                    <component>Querying</component>
                                        <votes>25</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="20330" author="auto" created="Mon, 15 Nov 2010 20:12:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: map/reduce into old collections  merge or reduce &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-647&quot; title=&quot;M/R: reduce into existing collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-647&quot;&gt;&lt;del&gt;SERVER-647&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
/mongodb/mongo/commit/94ba794b852279ac73c40b4c924f8b4487b2da8b&lt;/p&gt;</comment>
                            <comment id="20329" author="auto" created="Mon, 15 Nov 2010 20:12:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: working on merging m/r results &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-647&quot; title=&quot;M/R: reduce into existing collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-647&quot;&gt;&lt;del&gt;SERVER-647&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
/mongodb/mongo/commit/1bb47c4a9289e24cb9593b274540b1d7640f53f6&lt;/p&gt;</comment>
                            <comment id="14613" author="eliot" created="Mon, 7 Jun 2010 23:01:51 +0000"  >&lt;p&gt;From mathias on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-688&quot; title=&quot;Support merging into an existing collection with MapReduce&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-688&quot;&gt;&lt;del&gt;SERVER-688&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;Could have a flag merge=update or merge=rereduce, depending on if you want to ignore the original value or combine it with the new one. Could also take a function there if you need something custom like age-out.&lt;/p&gt;</comment>
                            <comment id="13082" author="kostya" created="Wed, 17 Mar 2010 16:13:56 +0000"  >&lt;p&gt;This could work like views in CouchDB !!! But, I&apos;m sure it will be faster !!!&lt;/p&gt;</comment>
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            <issuekey id="13835">SERVER-2166</issuekey>
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