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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-29585] Create a $_internalSchemaObjectMatch MatchExpression</title>
                <link>https://jira.mongodb.org/browse/SERVER-29585</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h5&gt;&lt;a name=&quot;ProposedSyntax&quot;&gt;&lt;/a&gt;Proposed Syntax&lt;/h5&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;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;lt;path&amp;gt;: $_internalSchemaObjectMatch: {&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;lt;ObjectConstraintMatchExpression&amp;gt;,&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;lt;ObjectConstraintMatchExpression&amp;gt;,&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;        ...&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;    }&lt;/span&gt;&lt;/pre&gt;
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						&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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;h5&gt;&lt;a name=&quot;ProposedSemantics&quot;&gt;&lt;/a&gt;Proposed Semantics&lt;/h5&gt;
&lt;p&gt;The field at &lt;tt&gt;&amp;lt;path&amp;gt;&lt;/tt&gt; matches the expression if it is an object and matches the sub-expression &lt;tt&gt;&amp;lt;topLevelMatchExpression&amp;gt;&lt;/tt&gt;. &lt;tt&gt;$_internalSchemaObjectMatch&lt;/tt&gt; allows for constraining the properties of a nested object, as top-level match expressions on their own cannot be used to constrain a subobject.&lt;/p&gt;</description>
                <environment></environment>
        <key id="393024">SERVER-29585</key>
            <summary>Create a $_internalSchemaObjectMatch MatchExpression</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="13201">Fixed</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jun 2017 19:49:07 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:09 +0000</updated>
                            <resolved>Tue, 11 Jul 2017 22:07:49 +0000</resolved>
                                                    <fixVersion>3.5.10</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1619389" author="xgen-internal-githook" created="Tue, 11 Jul 2017 22:06:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;nzolnierzmdb&apos;, u&apos;name&apos;: u&apos;Nick Zolnierz&apos;, u&apos;email&apos;: u&apos;nicholas.zolnierz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29585&quot; title=&quot;Create a $_internalSchemaObjectMatch MatchExpression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29585&quot;&gt;&lt;del&gt;SERVER-29585&lt;/del&gt;&lt;/a&gt;: Create a $_internalSchemaObjectMatch MatchExpression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ebecb306cf68009f01ccde363debfff3b268a9a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ebecb306cf68009f01ccde363debfff3b268a9a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1608076" author="kyle.suarez" created="Tue, 27 Jun 2017 21:02:41 +0000"  >&lt;p&gt;Reassigning this to Nick, as we&apos;re aggressively starting on the JSON Schema-to-MQL translation and require $objectMatch for many recursive object properties.&lt;/p&gt;</comment>
                            <comment id="1604419" author="david.storch" created="Thu, 22 Jun 2017 17:13:03 +0000"  >&lt;p&gt;A single match expression. You can always use &lt;tt&gt;$and&lt;/tt&gt; or &lt;tt&gt;$or&lt;/tt&gt; to meaningfully join a list of match expressions.&lt;/p&gt;</comment>
                            <comment id="1604349" author="kyle.suarez" created="Thu, 22 Jun 2017 15:57:18 +0000"  >&lt;p&gt;Should it accept a single match expression, or a list of match expressions?&lt;/p&gt;</comment>
                            <comment id="1604318" author="david.storch" created="Thu, 22 Jun 2017 15:30:50 +0000"  >&lt;p&gt;Hmm, these were not my proposed semantics for &lt;tt&gt;$_internalSchemaObjectMatch&lt;/tt&gt;. I was thinking that it would work like &lt;tt&gt;$elemMatch&lt;/tt&gt;. It would accept a path and a nested match expression:&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;{&quot;path.to.object&quot;: {$_internalSchemaObjectMatch: &amp;lt;MatchExpression&amp;gt;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;It would only match if &quot;path.to.object&quot; contains an element of BSONType::Object which also matches &amp;lt;MatchExpression&amp;gt;. So if you wanted to check that field &lt;tt&gt;nestedObj&lt;/tt&gt; was an object containing at least 5 properties you could write this:&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;
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						&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;{nestedObj: {$_internalSchemaObjectMatch: {$_internalSchemaMinProperties: 5}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
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