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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-6165] use of an integer valued double with a $mod expression can produce an incorrect result</title>
                <link>https://jira.mongodb.org/browse/SERVER-6165</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Observed behavior: If one of the arguments to $mod is a double, the left argument is cast to an int (not a long long) before the modulus is calculated.  This can result in a loss of information in the left operand before the modulus is calculated.&lt;br/&gt;
Expected behavior: Casting to an int does not occur in this case because it can alter the $mod result due to data loss.&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;c.save( {} );&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;// The correct mod is calculated.&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;assert.eq( 1, c.aggregate( { $project:{ z:{ $mod:[ NumberLong(&apos;4294967296&apos;), NumberLong( 3 ) ] } } } ).re\&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;sult[ 0 ].z );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;&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;// An incorrect mod is calculated due to a lossy integer conversion in ExpressionMod::evaluate.&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;assert.eq( 1, c.aggregate( { $project:{ z:{ $mod:[ NumberLong(&apos;4294967296&apos;), 3.0 ] } } } ).result[ 0 ].z \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="42046">SERVER-6165</key>
            <summary>use of an integer valued double with a $mod expression can produce an incorrect result</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="9">Done</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Jun 2012 19:38:09 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:19 +0000</updated>
                            <resolved>Tue, 3 Jul 2012 22:57:06 +0000</resolved>
                                                    <fixVersion>2.2.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="139454" author="auto" created="Wed, 4 Jul 2012 03:22:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-03T20:10:51-07:00&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;redbeard0531@gmail.com&apos;}
&lt;p&gt;Message: Don&apos;t use trunc() as it doesn&apos;t exist on windows &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6165&quot; title=&quot;use of an integer valued double with a $mod expression can produce an incorrect result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6165&quot;&gt;&lt;del&gt;SERVER-6165&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b84d28b8bd80603ce3c47f2a230914276c1bdb32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b84d28b8bd80603ce3c47f2a230914276c1bdb32&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="139401" author="auto" created="Tue, 3 Jul 2012 22:54:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-25T08:54:08-07:00&apos;, u&apos;email&apos;: u&apos;dannenberg.matt@gmail.com&apos;, u&apos;name&apos;: u&apos;Matt Dannenberg&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6165&quot; title=&quot;use of an integer valued double with a $mod expression can produce an incorrect result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6165&quot;&gt;&lt;del&gt;SERVER-6165&lt;/del&gt;&lt;/a&gt; fix $mod to work with any numerictype&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d13d5f4016ae3857e719890e09a8aef8dd3c9a5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d13d5f4016ae3857e719890e09a8aef8dd3c9a5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="136723" author="eliot" created="Tue, 26 Jun 2012 17:49:47 +0000"  >&lt;p&gt;We should just uassert on doubles anywhere in $mod&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="42363">SERVER-6206</issuekey>
        </issuelink>
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