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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-39446] $push/$pushAll to honor $position past end of array</title>
                <link>https://jira.mongodb.org/browse/SERVER-39446</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The $position operator ($push/$pushAll) has a restriction that ignores all positions past the end of an array:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;If the value of &amp;lt;num&amp;gt; is greater or equal to the length of the array, the $position modifier has no effect and $push adds elements to the end of the array.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/update/position/#position&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/update/position/#position&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This seems intentional in the original design (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2363&quot; title=&quot;$push/$pushAll support for insertion at any position (top/bottom/ordinal)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2363&quot;&gt;&lt;del&gt;SERVER-2363&lt;/del&gt;&lt;/a&gt;) but limits common use cases. It also differs from behavior elsewhere using dot notation on an existing array:&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;
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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;&amp;gt; db.foo.insertOne({ _id: &quot;d&quot;, field: [] });&lt;/span&gt;&lt;/pre&gt;
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				&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;{ &quot;acknowledged&quot; : true, &quot;insertedId&quot; : &quot;d&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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.foo.updateOne({ _id: &quot;d&quot; }, { $set:&#160;{ &quot;field.4&quot;: 5 } }, { upsert: 1 })&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;{ &quot;acknowledged&quot; : true, &quot;matchedCount&quot; : 1, &quot;modifiedCount&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.foo.find(}&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; : &quot;d&quot;, &quot;field&quot; : [ null, null, null, null, 5 ] }&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;It would seem logical, beneficial, and consistent to enable the positional operator to add the values of $each to any position of the array. This provides additional value for upserts by providing an alternative to dot notation that may create inconsistent documents (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13478&quot; title=&quot;Resolve ambiguity of positional array updates when the path does not exist&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13478&quot;&gt;SERVER-13478&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="685769">SERVER-39446</key>
            <summary>$push/$pushAll to honor $position past end of array</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="justin.labreck@mongodb.com">Justin LaBreck</reporter>
                        <labels>
                    </labels>
                <created>Fri, 8 Feb 2019 00:43:12 +0000</created>
                <updated>Tue, 6 Dec 2022 03:06:10 +0000</updated>
                            <resolved>Sat, 29 Jun 2019 09:14:28 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2305686" author="asya" created="Sat, 29 Jun 2019 09:14:14 +0000"  >&lt;p&gt;In 4.2 this can now be achieved using update pipelines with aggregation expressions.&lt;/p&gt;

&lt;p&gt;In that case this result could be achieved directly by using $concatArrays...&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="129302">SERVER-13478</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="14225">SERVER-2363</issuekey>
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