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    <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-10869] Expand $project changes in 3.2-&gt;3.4 compatibility changes</title>
                <link>https://jira.mongodb.org/browse/DOCS-10869</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;During the 3.4 development cycle we re-wrote the $project stage. Our &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.4-compatibility/#general-compatibility-changes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;compatibility notes already list one $project compatibility change&lt;/a&gt;, but there are more that are worth mentioning. Specifically, the following:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$project: {a: {b: &quot;$missingField&quot;}}} used to be {}, now (3.4+) is {a: {}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$project: {&apos;a.b&apos;: &amp;lt;expression&amp;gt;}} used to be {&apos;a.b&apos;: &amp;lt;result of expression&amp;gt;}, now is an error (field names with dots aren&apos;t really supported elsewhere)&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;_id will always show up in explain output for inclusion projections, even if not explicitly mentioned.&lt;/span&gt;&lt;/pre&gt;
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                <environment></environment>
        <key id="440379">DOCS-10869</key>
            <summary>Expand $project changes in 3.2-&gt;3.4 compatibility changes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Oct 2017 16:27:25 +0000</created>
                <updated>Mon, 30 Oct 2023 21:06:09 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4940658" author="edu.bot" created="Mon, 31 Oct 2022 16:08:46 +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="1783924" author="pavithra.vetriselvan" created="Wed, 24 Jan 2018 20:10:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=greg.mckeon&quot; class=&quot;user-hover&quot; rel=&quot;greg.mckeon&quot;&gt;greg.mckeon&lt;/a&gt;, I think I handed this ticket back to Kay while it was in CR. Not sure what the progress has been since then.   &lt;/p&gt;</comment>
                            <comment id="1783899" author="greg.mckeon" created="Wed, 24 Jan 2018 19:54:37 +0000"  >&lt;p&gt;Ping &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;, is this now closed?&lt;/p&gt;</comment>
                            <comment id="1689177" author="charlie.swanson" created="Wed, 4 Oct 2017 17:12:10 +0000"  >&lt;p&gt;Actually, I misspoke here. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31282?focusedCommentId=1689172&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1689172&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt;, the second one only impacts &lt;tt&gt;$group&lt;/tt&gt; compatibility, and only when used as the &lt;tt&gt;_id&lt;/tt&gt; argument.&lt;/p&gt;</comment>
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