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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-68766] Add option to re-enable single value MapReduce optimization</title>
                <link>https://jira.mongodb.org/browse/SERVER-68766</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is in the &lt;a href=&quot;https://www.mongodb.com/docs/v6.0/reference/command/mapReduce/#requirements-for-the-reduce-function&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation for MapReduce&lt;/a&gt; from 4.2 to 6.0:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;MongoDB will&#160;&lt;b&gt;not&lt;/b&gt;&#160;call the&#160;&lt;tt&gt;reduce&lt;/tt&gt;&#160;function for a key that has only a single value. The&#160;&lt;tt&gt;values&lt;/tt&gt;&#160;argument is an array whose elements are the&#160;&lt;tt&gt;value&lt;/tt&gt;&#160;objects that are &quot;mapped&quot; to the&#160;&lt;tt&gt;key&lt;/tt&gt;.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;However, from 4.4 onwards, the reduce function &lt;em&gt;will&lt;/em&gt; be called regardless of how many values are associated with a given key. PM-766 added a new execution engine for MapReduce commands based on the Aggregation Framework that is active in 4.4 and above.&lt;br/&gt;
&#160;&lt;br/&gt;
If the implementation is changed, then two possible fixes are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/958ad9abfc80861d3f43f44da694e83464b01e1d/src/mongo/db/pipeline/accumulator_js_reduce.cpp#L119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AccumulatorJsReduce::getValue()&lt;/a&gt;&#160;can be modified to not call into the JS reduce function if the length the&#160;&lt;tt&gt;_values&lt;/tt&gt; vector is exactly 1. Instead, it will just return that value to the caller. This fix has the benefit of not adding any logic to the generated MQL.&lt;/li&gt;
	&lt;li&gt;The&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/958ad9abfc80861d3f43f44da694e83464b01e1d/src/mongo/db/commands/mr_common.cpp#L124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;translateReduce() function&lt;/a&gt;&#160;can be modified to only call the internal JsReduce accumulator if the&#160;&lt;tt&gt;$emits&lt;/tt&gt;&#160;array has a length larger than 1, and otherwise, just return the document inside&#160;&lt;tt&gt;$emits&lt;/tt&gt;.&lt;br/&gt;
&#160;&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2111974">SERVER-68766</key>
            <summary>Add option to re-enable single value MapReduce optimization</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="davis.haupt@mongodb.com">Davis Haupt</assignee>
                                    <reporter username="davis.haupt@mongodb.com">Davis Haupt</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Aug 2022 20:16:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:36 +0000</updated>
                            <resolved>Mon, 29 Aug 2022 14:25:57 +0000</resolved>
                                                    <fixVersion>4.4.17</fixVersion>
                    <fixVersion>5.0.12</fixVersion>
                    <fixVersion>6.0.2</fixVersion>
                    <fixVersion>6.1.0-rc1</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4792831" author="xgen-internal-githook" created="Wed, 31 Aug 2022 18:41:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68766&quot; title=&quot;Add option to re-enable single value MapReduce optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68766&quot;&gt;&lt;del&gt;SERVER-68766&lt;/del&gt;&lt;/a&gt; add server parameter to enable single value reduce optimization&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/59217e73260289054bcb91fea3f104d5f6cf34e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/59217e73260289054bcb91fea3f104d5f6cf34e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4785134" author="xgen-internal-githook" created="Mon, 29 Aug 2022 19:57:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68766&quot; title=&quot;Add option to re-enable single value MapReduce optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68766&quot;&gt;&lt;del&gt;SERVER-68766&lt;/del&gt;&lt;/a&gt; add server parameter to enable single value reduce optimization&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/79cfcdd83eb6f64e164a588d0daf9bb873328b45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/79cfcdd83eb6f64e164a588d0daf9bb873328b45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4785000" author="xgen-internal-githook" created="Mon, 29 Aug 2022 19:18:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68766&quot; title=&quot;Add option to re-enable single value MapReduce optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68766&quot;&gt;&lt;del&gt;SERVER-68766&lt;/del&gt;&lt;/a&gt; add server parameter to enable single value reduce optimization&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5133ed46464a264b8b6b3a08434978014783f3eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5133ed46464a264b8b6b3a08434978014783f3eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4784734" author="xgen-internal-githook" created="Mon, 29 Aug 2022 17:57:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68766&quot; title=&quot;Add option to re-enable single value MapReduce optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68766&quot;&gt;&lt;del&gt;SERVER-68766&lt;/del&gt;&lt;/a&gt; add server parameter to enable single value reduce optimization&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/004a674a8421d9151c9e8f497401b0503fdcd6ca&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/004a674a8421d9151c9e8f497401b0503fdcd6ca&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4780620" author="xgen-internal-githook" created="Fri, 26 Aug 2022 20:04:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68766&quot; title=&quot;Add option to re-enable single value MapReduce optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68766&quot;&gt;&lt;del&gt;SERVER-68766&lt;/del&gt;&lt;/a&gt; add server parameter to enable single value reduce optimization&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7bfcf3b42ebf7f4600abfeae30cae644ac5d72e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7bfcf3b42ebf7f4600abfeae30cae644ac5d72e7&lt;/a&gt;&lt;/p&gt;</comment>
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;).results;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.adminCommand({setFeatureCompatibilityVersion: &quot;4.2&quot;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;printjson(runMR())&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// &amp;gt;&amp;gt;&amp;gt; [ { &quot;_id&quot; : 0, &quot;value&quot; : &quot;mapped value&quot; } ]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.adminCommand({setFeatureCompatibilityVersion: &quot;4.4&quot;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;printjson(runMR())&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// &amp;gt;&amp;gt;&amp;gt; [ { &quot;_id&quot; : 0, &quot;value&quot; : &quot;reduced value&quot; } ]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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