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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-31821] Update operator $min handles non-existent array elements differently in 3.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-31821</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The `$min` update operator did not update certain non-existent array elements in 3.4 and 3.2, which is no longer the case in 3.6. The behavior under 3.6 seems to be the more correct one.&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;db.test.insert({&quot;_id&quot;: &quot;unique&quot;, &quot;a&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;db.test.update({}, {&quot;$min&quot;: {&quot;a.1&quot;: {&quot;x&quot;: 1}, &quot;a.0&quot;: {&quot;y&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;&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;// 3.6: {  &quot;_id&quot; : &quot;unique&quot;,  &quot;a&quot; : [ { &quot;y&quot; : 1 }, { &quot;x&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;   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;// 3.4 and prior: {  &quot;_id&quot; : &quot;unique&quot;,  &quot;a&quot; : [ null, { &quot;x&quot; : 1 } ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="454533">SERVER-31821</key>
            <summary>Update operator $min handles non-existent array elements differently in 3.6</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                            <label>ufz</label>
                    </labels>
                <created>Fri, 3 Nov 2017 16:15:25 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:07 +0000</updated>
                            <resolved>Fri, 3 Nov 2017 16:41:46 +0000</resolved>
                                    <version>3.2.17</version>
                    <version>3.4.10</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1716635" author="justin.seyster" created="Fri, 3 Nov 2017 16:40:07 +0000"  >&lt;p&gt;That&apos;s an interesting behavior. Thanks for pointing it out! The update is actually behaving as designed in both cases.&lt;/p&gt;

&lt;p&gt;In 3.4, fields get updated in the order that they appear in the update document. The update to &quot;a.1&quot; extended the &quot;a&quot; array so that it looks like [null, &lt;/p&gt;
{x: 1}
&lt;p&gt;]. The update to &quot;a.0&quot; then becomes a no-op, because null is considered less than &lt;/p&gt;
{y: 1}
&lt;p&gt;.&lt;/p&gt;

&lt;p&gt;In 3.6, updates get ordered lexicographically by field name, so that &quot;a.0&quot; gets applied before the &quot;a.1&quot; update. Unfortunately, it is still possible in 3.6 to update two array fields out of order: e.g., an update to &quot;a.10&quot; will get applied before an update to &quot;a.2&quot; because indexes are ordered lexicographically rather than numerically. I&apos;d still say this is behaving as intended, though.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                        <issuelink>
            <issuekey id="456765">SERVER-31894</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="506110">SERVER-33687</issuekey>
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