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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-49540] Wrong document returned by find({_id: value as Int64})</title>
                <link>https://jira.mongodb.org/browse/SERVER-49540</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A search like : db.getCollection(&apos;gff&apos;).find({_id:71549674884444169})&lt;/p&gt;

&lt;p&gt;returns document with _id = 71549674884444168&lt;/p&gt;

&lt;p&gt;There is a 1 offset in the _id value.&lt;/p&gt;

&lt;p&gt;Happens in Mongo Compass and in Robot3T.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1412031">SERVER-49540</key>
            <summary>Wrong document returned by find({_id: value as Int64})</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="szoke.szaniszlo@gmail.com">Szaniszlo Sz&#246;ke</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Jul 2020 12:49:58 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:47 +0000</updated>
                            <resolved>Thu, 16 Jul 2020 14:08:00 +0000</resolved>
                                    <version>4.0.4</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3288433" author="bruce.lucas@10gen.com" created="Thu, 16 Jul 2020 17:23:40 +0000"  >&lt;p&gt;You&apos;re welcome, and happy your problem has been resolved.&lt;/p&gt;</comment>
                            <comment id="3287977" author="JIRAUSER1254160" created="Thu, 16 Jul 2020 14:29:13 +0000"  >&lt;p&gt;Thanks a lot for you super-fast answer.&lt;/p&gt;

&lt;p&gt;Works fine with the C# drivers too.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3287917" author="bruce.lucas@10gen.com" created="Thu, 16 Jul 2020 14:07:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=szoke.szaniszlo%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;szoke.szaniszlo@gmail.com&quot;&gt;szoke.szaniszlo@gmail.com&lt;/a&gt;, this is occurring because Javascript stores 71549674884444169 as a floating-point number, which has only 53 bits of precision, so cannot represent all 64-bit numbers. In order to query a db that has 64-bit _ids from Javascript you need to use NumberLong to construct a 64-bit number. The following illustrates this point:&lt;/p&gt;

&lt;p&gt;Insert two records with 64-bit integer _ids&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.c.insert({_id: NumberLong(&quot;71549674884444168&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;&amp;gt; db.c.insert({_id: NumberLong(&quot;71549674884444169&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;Find using 71549674884444169 returns the wrong document as you indicated because the low order bits of the number are lost when it is stored as floating point and then converted to 64-bit integer to query the db:&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.c.find({_id: 71549674884444169})&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; : NumberLong(&quot;71549674884444168&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;But if you use NumberLong(&quot;71549674884444169&quot;) the right document is returned:&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.c.find({_id: NumberLong(&quot;71549674884444169&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; : NumberLong(&quot;71549674884444169&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;Since this is working as expected I will close the ticket.&lt;/p&gt;</comment>
                            <comment id="3287896" author="JIRAUSER1254160" created="Thu, 16 Jul 2020 14:01:58 +0000"  >&lt;p&gt;The same applies to the latest version (4.2.8).&lt;/p&gt;

&lt;p&gt;It seems that the value is rounded and that the server returns some value &quot;close&quot; to the filter value.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="270188" name="BugMongo01.jpg" size="81242" author="szoke.szaniszlo@gmail.com" created="Thu, 16 Jul 2020 12:47:27 +0000"/>
                            <attachment id="270196" name="BugMongo03.jpg" size="155545" author="szoke.szaniszlo@gmail.com" created="Thu, 16 Jul 2020 13:59:17 +0000"/>
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