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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-32782] [Change Streams] Make updatedFields queryable for dot-notated fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-32782</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Can we get a fix in the Change Streams generation engine generate updatedFields that are NOT dot-notated?&lt;/p&gt;

&lt;p&gt;For instance, instead of&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;   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;updatedFields: { &apos;device.temperature&apos;: 70}&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 be nice if we could decompose the dot-notated &apos;device.temperature&apos; string into:&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;   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;updatedFields: { device: {temperature: 70}}&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;This is related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21889&quot; title=&quot;Oplog format for $set operations on subdocuments creates format that is not queryable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21889&quot;&gt;SERVER-21889&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;I know this might affect the performance of change streams but without that improvement, the use of change streams might turn out to be limited (and restricted to inserts and top-level attributes updates)&lt;/p&gt;</description>
                <environment></environment>
        <key id="484651">SERVER-32782</key>
            <summary>[Change Streams] Make updatedFields queryable for dot-notated fields</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="raphael.londner">Raphael Londner</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jan 2018 22:17:15 +0000</created>
                <updated>Tue, 6 Dec 2022 03:40:55 +0000</updated>
                            <resolved>Sat, 20 Jan 2018 21:32:49 +0000</resolved>
                                    <version>3.6.2</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1779947" author="asya" created="Sat, 20 Jan 2018 21:32:35 +0000"  >&lt;p&gt;This ticket will be properly resolved when we fix the query language to allow querying documents which have dotted field names.&lt;/p&gt;</comment>
                            <comment id="1779239" author="raphael.londner" created="Fri, 19 Jan 2018 17:42:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; you are 100% correct, but I am only suggesting a &lt;b&gt;syntax&lt;/b&gt; that would work with change stream $match filters such as { updateDescription.updatedFields.device.temperature: { $gt: 80 }}. To your point, it might be necessary to add an additional flag to differentiate between a &apos;device.temperature&apos; update and a real {device: {temperature}} one, in order to avoid confusing a listening application.&lt;/p&gt;

&lt;p&gt;As I mentioned earlier, we can&apos;t rely on the `fullDocument` node of the change stream since it might be out-of-sync with `updatedFields`.&lt;/p&gt;

&lt;p&gt;If you have a better suggestion to handle these filter queries, please feel free to recommend one. &lt;/p&gt;</comment>
                            <comment id="1779080" author="asya" created="Fri, 19 Jan 2018 16:06:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=raphael.londner&quot; class=&quot;user-hover&quot; rel=&quot;raphael.londner&quot;&gt;raphael.londner&lt;/a&gt; the second format is 100% &lt;b&gt;not&lt;/b&gt; equivalent to the first format.&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;   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;updatedFields: { device: {temperature: 70}}&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;means that device is now exactly a subdocument with one field: &quot;temperature&quot;.  The dotted notation means that temperature is now 70, other fields are not affected.&lt;/p&gt;
</comment>
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