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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>[DOCS-7792] $mod silently truncates decimal arguments to integers</title>
                <link>https://jira.mongodb.org/browse/DOCS-7792</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The $mod conditional operator casts all its inputs into LONG&apos;s before executing the modulo calculation and comparison.  This truncates any decimal values back to their integer parts, which causing some users to get unexpected results.  For example, if db.collName.f1 holds &lt;span class=&quot;error&quot;&gt;&amp;#91;0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, ... 9.0, 9.5, 10&amp;#93;&lt;/span&gt; then these statements:&lt;/p&gt;

&lt;p/&gt;
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&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;  db.collName.find({ &quot;f1&quot;: {$mod:[5.5, 2.5]} }) &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  db.collName.find({ &quot;f1&quot;: {$mod:[5,    2]} }) &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;both return &lt;span class=&quot;error&quot;&gt;&amp;#91;2.0, 2.5, 7.0, 7.5&amp;#93;&lt;/span&gt; because we don&apos;t return the documents where ((f1 % 5.5) == 2.5), we return those where ((floor(f1) % floor(5.5)) == floor(2.5)).&lt;/p&gt;

&lt;p&gt;While I accept that MongoDB does this &quot;integer division&quot; because it stores numbers in binary floating point and floating point calculations are prone to rounding errors, I think that we should make this clearer in the manual entry for $mod (&lt;a href=&quot;https://docs.mongodb.org/manual/reference/operator/query/mod/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/manual/reference/operator/query/mod/&lt;/a&gt;).  Most users expect that mod will behave the same way as it does in their other databases/applications/programming environments/etc because it is a generic mathematical term.&lt;/p&gt;</description>
                <environment></environment>
        <key id="283980">DOCS-7792</key>
            <summary>$mod silently truncates decimal arguments to integers</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="emet.ozar@mongodb.com">Emet Ozar</assignee>
                                    <reporter username="william.byrne@mongodb.com">William Byrne III</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 May 2016 04:50:57 +0000</created>
                <updated>Mon, 30 Oct 2023 21:32:47 +0000</updated>
                            <resolved>Mon, 31 Oct 2022 16:28:31 +0000</resolved>
                                    <version>mongodb-2.6</version>
                    <version>mongodb-3.0</version>
                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4941036" author="edu.bot" created="Mon, 31 Oct 2022 16:14:08 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1787964" author="andrew.aldridge@10gen.com" created="Mon, 29 Jan 2018 18:04:02 +0000"  >&lt;p&gt;Pending resolution to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32960&quot; title=&quot;$mod has inconsistent rounding/truncation behavior&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32960&quot;&gt;&lt;del&gt;SERVER-32960&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1254508" author="william.byrne" created="Wed, 4 May 2016 07:42:34 +0000"  >&lt;p&gt;I meant to note that in 3.4 we will add support for DECIMAL and $mod will be reworked to use it where appropriate: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1393&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-1393&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So this DOC change would need to be of the form &quot;up until version 3.2, $mod performs &lt;b&gt;integer division&lt;/b&gt;...&quot;&lt;/p&gt;</comment>
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            <issuekey id="488814">SERVER-32960</issuekey>
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            <issuelink>
            <issuekey id="488820">SERVER-32961</issuekey>
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