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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-32961] Add $fmod, or some way to mod by fractional numbers, to the match expression language</title>
                <link>https://jira.mongodb.org/browse/SERVER-32961</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;$mod&lt;/tt&gt; query operator converts fractional numbers to integers to do the modular arithmetic. It still makes sense to mod by a fractional number in some scenarios. &lt;/p&gt;</description>
                <environment></environment>
        <key id="488820">SERVER-32961</key>
            <summary>Add $fmod, or some way to mod by fractional numbers, to the match expression language</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>expression</label>
                            <label>mql-semantics</label>
                    </labels>
                <created>Mon, 29 Jan 2018 17:36:13 +0000</created>
                <updated>Tue, 6 Dec 2022 03:39:49 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1789089" author="david.storch" created="Tue, 30 Jan 2018 15:37:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;, if I understand correctly, this ticket is specifically about the match expression language, not the agg expression language. I&apos;ve updated the title of the ticket to clarify.&lt;/p&gt;</comment>
                            <comment id="1789001" author="geert.bosch" created="Tue, 30 Jan 2018 14:59:48 +0000"  >&lt;p&gt;Actually, it seems &lt;tt&gt;$mod&lt;/tt&gt; aggregation operator does support fractional numbers:&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;
		&lt;tbody &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-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.money.insert({amount: NumberDecimal(&quot;12.30&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;WriteResult({ &quot;nInserted&quot; : 1 })&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.money.aggregate([{$addFields: { quarters: {$trunc: {$divide:[&quot;$amount&quot;, NumberDecimal(&quot;0.25&quot;)]}}, cents:{$mod: [&quot;$amount&quot;,NumberDecimal(&quot;0.25&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;   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;{ &quot;_id&quot; : ObjectId(&quot;5a7086df3130aa7be79b246f&quot;), &quot;amount&quot; : NumberDecimal(&quot;12.30&quot;), &quot;quarters&quot; : NumberDecimal(&quot;49&quot;), &quot;cents&quot; : NumberDecimal(&quot;0.05&quot;) }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The &lt;tt&gt;ExpressionMod&lt;/tt&gt; code looks correct as well. &lt;/p&gt;</comment>
                            <comment id="1788060" author="david.storch" created="Mon, 29 Jan 2018 18:56:05 +0000"  >&lt;p&gt;As part of JSON Schema, we implemented internal support for fmod in the match expression language: &lt;tt&gt;$_internalSchemaFmod&lt;/tt&gt;:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2487ab101a42434e1f61e68ee7c2383432861f8b/src/mongo/db/matcher/schema/expression_internal_schema_fmod.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/2487ab101a42434e1f61e68ee7c2383432861f8b/src/mongo/db/matcher/schema/expression_internal_schema_fmod.h&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Assuming this implements the behavior we want in general, we could change this to be exposed to clients.&lt;/p&gt;</comment>
                            <comment id="1787929" author="charlie.swanson" created="Mon, 29 Jan 2018 17:36:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt; can you elaborate on the use case you were describing earlier? Not sure I followed enough to summarize myself &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
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            <issuekey id="283980">DOCS-7792</issuekey>
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