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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>
    </build-info>


<item>
            <title>[SERVER-10682] Expose $multiply as both an accumulator and an expression</title>
                <link>https://jira.mongodb.org/browse/SERVER-10682</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would perform like &lt;tt&gt;$sum&lt;/tt&gt;, but compute the multiplied product instead of an additive sum.&lt;/p&gt;

&lt;p&gt;Just as &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.2/#accumulator-expression-availability&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;these operators&lt;/a&gt; became available both as accumulators (for grouping) and expressions (for simple transformations like in $project) in 3.2, we should make $multiply work with an array of inputs, and also be available as an accumulator during the $group stage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="88530">SERVER-10682</key>
            <summary>Expose $multiply as both an accumulator and an expression</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="jmikola@mongodb.com">Jeremy Mikola</reporter>
                        <labels>
                            <label>accumulator</label>
                            <label>expression</label>
                    </labels>
                <created>Wed, 4 Sep 2013 19:14:45 +0000</created>
                <updated>Tue, 6 Dec 2022 05:18:18 +0000</updated>
                                            <version>2.5.2</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1779088" author="charlie.swanson" created="Fri, 19 Jan 2018 16:07:12 +0000"  >&lt;p&gt;There have been several similar requests for something like this feature, so I&apos;ve updated the summary and description to reflect our plans for what we would likely implement, which I think would address all the issues linked as duplicates here.&lt;/p&gt;</comment>
                            <comment id="1237587" author="asya" created="Fri, 15 Apr 2016 20:15:54 +0000"  >&lt;p&gt;Implementation of $reduce expression (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17258&quot; title=&quot;Add $reduce expression operator for rollup of arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17258&quot;&gt;&lt;del&gt;SERVER-17258&lt;/del&gt;&lt;/a&gt;) should make it possible to multiply elements in an array during $project.&lt;/p&gt;</comment>
                            <comment id="417963" author="jmikola@gmail.com" created="Wed, 4 Sep 2013 20:25:08 +0000"  >&lt;p&gt;As we discussed in the kitchen, deprecating &lt;tt&gt;$add&lt;/tt&gt; and sticking with the arithmetic operator names makes sense.&lt;/p&gt;

&lt;p&gt;As for a test case, I think something based on what I wrote in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10681&quot; title=&quot;$multiply operator cannot processed a referenced array field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10681&quot;&gt;&lt;del&gt;SERVER-10681&lt;/del&gt;&lt;/a&gt; would work:&lt;/p&gt;

&lt;p/&gt;
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					&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;{ &quot;_id&quot; : ObjectId(&quot;522784a423582cd7f71acca7&quot;), &quot;x&quot; : 2 }&lt;/span&gt;&lt;/pre&gt;
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					&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;{ &quot;_id&quot; : ObjectId(&quot;522784a623582cd7f71acca9&quot;), &quot;x&quot; : 4 }&lt;/span&gt;&lt;/pre&gt;
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					&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; pipeline&lt;/span&gt;&lt;/pre&gt;
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					&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;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;        &quot;$group&quot; : {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            &quot;_id&quot; : 1,&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            &quot;product&quot; : {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                &quot;$multiply&quot; : &quot;$x&quot;&lt;/span&gt;&lt;/pre&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;
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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;&amp;gt; db.foo.aggregate(pipeline)&lt;/span&gt;&lt;/pre&gt;
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					&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;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;</comment>
                            <comment id="417941" author="scotthernandez" created="Wed, 4 Sep 2013 19:54:55 +0000"  >&lt;p&gt;I&apos;m suggesting we should really use $sum in both places and deprecate $add. $multiply can work in both contexts, and with arrays &amp;#8211; no need for a sep. pipeline stage.&lt;/p&gt;

&lt;p&gt;Do you have test case for what you are interested in supporting with input and result?&lt;/p&gt;</comment>
                            <comment id="417927" author="jmikola@gmail.com" created="Wed, 4 Sep 2013 19:39:40 +0000"  >&lt;p&gt;Even if &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10676&quot; title=&quot;$multiply does not support a reference to an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10676&quot;&gt;&lt;del&gt;SERVER-10676&lt;/del&gt;&lt;/a&gt; was implemented, this would require a group step to collect values in an array, and then a projection to multiply them.&lt;/p&gt;

&lt;p&gt;Supporting &lt;tt&gt;$multiply&lt;/tt&gt; as a first-class &lt;tt&gt;$group&lt;/tt&gt; operator doesn&apos;t seem correct, for the same reason that we distinguish &lt;tt&gt;$sum&lt;/tt&gt; from &lt;tt&gt;$add&lt;/tt&gt;. Certainly, if you wanted to compute the combined products of arrays of numbers across documents you&apos;re grouping, I suppose you could do:&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;   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;{ $product: { $multiply: &quot;$vals&quot; }}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                            <comment id="417922" author="scotthernandez" created="Wed, 4 Sep 2013 19:33:11 +0000"  >&lt;p&gt;Why not just make $multiple work with arrays, and in $group?&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="484894">SERVER-32789</issuekey>
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            <issuekey id="88454">SERVER-10676</issuekey>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="88528">SERVER-10681</issuekey>
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                                        <issuelink>
            <issuekey id="183725">SERVER-17258</issuekey>
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