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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-287] Finalizer for group()</title>
                <link>https://jira.mongodb.org/browse/SERVER-287</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice if there was an extra finalizer option on the group command. Right now it is difficult to implement an average function using just group(). While this could be done in the calling language, in some cases it is nice to be able to do everything in one place in javascript.&lt;/p&gt;

&lt;p&gt;Example&lt;/p&gt;

&lt;p&gt;db.coll.group(&lt;br/&gt;
{key:&quot;date&quot;&lt;br/&gt;
,initial: &lt;/p&gt;
{ct:0, sum:0}
&lt;p&gt;,reduce: function(doc, out)&lt;/p&gt;
{out.ct++; out.sum += doc.val}
&lt;p&gt;,final: function(result)&lt;/p&gt;
{result.sum = result.ct ? result.sum/result.ct : 0}
&lt;p&gt;})&lt;/p&gt;

&lt;p&gt;Ideally, if the final function returned a non-undefined result it would replace that position in the output, similar to a map function.&lt;/p&gt;</description>
                <environment></environment>
        <key id="10577">SERVER-287</key>
            <summary>Finalizer for group()</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Sep 2009 14:39:18 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:25 +0000</updated>
                            <resolved>Thu, 17 Sep 2009 11:01:50 +0000</resolved>
                                                    <fixVersion>1.1.1</fixVersion>
                                    <component>Usability</component>
                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="10767" author="redbeard0531" created="Thu, 17 Sep 2009 11:22:00 +0000"  >&lt;p&gt;Note: final has been renamed &apos;finalize&apos; to avoid conflicting with JavaScript reserved words. See jstests/group3.js for examples.&lt;/p&gt;</comment>
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