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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29339] allow using $reduce expression as accumulator in $group</title>
                <link>https://jira.mongodb.org/browse/SERVER-29339</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If $group accepted $reduce as accumulator, it would allow expressing any and all accumulator operations that we don&apos;t have implemented.&lt;/p&gt;

&lt;p&gt;Proposed syntax:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;{$group:{_id:&amp;lt;expr&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      g:{$reduce:{&lt;/span&gt;&lt;/pre&gt;
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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;             input:&amp;lt;expr&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
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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;             initialValue:&amp;lt;expr&amp;gt;,&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;             in:&amp;lt;expr&amp;gt; // using &quot;$$value&quot; and &quot;$$this&quot; same as the $reduce expression&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;      } }&lt;/span&gt;&lt;/pre&gt;
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					&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;} }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="386266">SERVER-29339</key>
            <summary>allow using $reduce expression as accumulator in $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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>accumulator</label>
                            <label>expression</label>
                    </labels>
                <created>Tue, 23 May 2017 21:13:49 +0000</created>
                <updated>Tue, 6 Dec 2022 04:00:30 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>7</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="3386552" author="david.percy" created="Thu, 10 Sep 2020 23:38:45 +0000"  >&lt;p&gt;This would be great! &lt;/p&gt;

&lt;p&gt;How would this interact with sharding though? Currently, $reduce guarantees an ordering (a left-fold), which matters if your accumulated $$value has a different shape than the input, $$this. But in a sharded $group we need to combine $$value1 and $$value2 from two different shards.&lt;/p&gt;

&lt;p&gt;So maybe the accumulator version of $reduce shouldn&apos;t guarantee that ordering: $$this might be a new input, or a $$value from another shard. Maybe also we don&apos;t need to initialValue, because we never create empty groups.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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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;  margin-top: 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; db.c.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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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;{ _id: &quot;a&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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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;{ _id: &quot;b&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&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;{ _id: &quot;c&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;{ _id: &quot;d&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;&amp;gt; db.c.aggregate({$group: {_id: 1, v: {$reduce: {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&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;    input: &quot;$_id&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    in: {$concat: [&quot;(&quot;, $$value, &quot; &quot;, $$this, &quot;)&quot;]},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&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;  } } } })&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;{ _id: 1, v: &quot;((a b) (c d))&quot;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="2272664" author="tatobari" created="Wed, 5 Jun 2019 17:15:06 +0000"  >&lt;p&gt;Would be a great functionality and it would also save a lo lot time.&lt;/p&gt;</comment>
                            <comment id="1586021" author="asya" created="Fri, 2 Jun 2017 15:20:11 +0000"  >&lt;p&gt;This would allow accumulators to be created from any expression that already works on arrays.&lt;/p&gt;

&lt;p&gt;Examples: $concat, $concatArrays.&lt;/p&gt;

&lt;p&gt;Also ones that we don&apos;t have but have had requests for:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15697&quot; title=&quot;Create a string accumulator for aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15697&quot;&gt;SERVER-15697&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4929&quot; title=&quot;aggregation:  $group should have a $median accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4929&quot;&gt;SERVER-4929&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16284&quot; title=&quot;Allow for $pushall / $push with $each to allow pushing all elements of array in $group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16284&quot;&gt;SERVER-16284&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7463&quot; title=&quot;$percentile aggregation accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7463&quot;&gt;SERVER-7463&lt;/a&gt;&lt;br/&gt;
and even possibly &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9377&quot; title=&quot;Allow collecting &amp;quot;top&amp;quot; N values for each group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9377&quot;&gt;&lt;del&gt;SERVER-9377&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1585936" author="asya" created="Fri, 2 Jun 2017 14:28:23 +0000"  >&lt;p&gt;The use cases for this are possibly related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29161&quot; title=&quot;Ability to access previous document in $group aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29161&quot;&gt;&lt;del&gt;SERVER-29161&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;The use case for being able to custom $reduce while accumulating may be doable with access to $$PREVIOUS, since $$PREVIOUS can now act as &quot;$$value&quot; does in $reduce.&lt;/p&gt;

&lt;p&gt;The difference would be that having access to $$PREVIOUS would not expand your set of accumulator expressions in $group, so I think it wouldn&apos;t quite give you the flexibility $reduce would provide.&lt;/p&gt;

&lt;p&gt;But having $reduce as accumulator would not make this ticket unnecessary, though there are some use cases that could be accomplished with either of these if both were implemented. &lt;/p&gt;</comment>
                    </comments>
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