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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-12890] Validate values in query projection</title>
                <link>https://jira.mongodb.org/browse/SERVER-12890</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using query projection, only 1/0 and true/false are valid for the values (plus &lt;tt&gt;null&lt;/tt&gt; and &lt;tt&gt;undefined&lt;/tt&gt; maybe):&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;/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;&amp;gt; db.foo.find({ $text: { $search: &quot;dog&quot; } }, { foo: true, _id: 0 })&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Other values should be disallowed, for example:&lt;/p&gt;
&lt;p/&gt;
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&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;gt; db.foo.find({ $text: { $search: &quot;dog&quot; } }, { foo: &quot;bar&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;&amp;gt; db.foo.find({ a:1}, { $foo: {} })&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;&amp;gt; db.foo.find({ $text: { $search: &quot;dog&quot; } }, { $meta: &quot;textScore&quot; })&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;Especially for text search, &lt;tt&gt;$meta: &quot;textScore&quot;&lt;/tt&gt; can be very confusing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="114520">SERVER-12890</key>
            <summary>Validate values in query projection</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Tue, 25 Feb 2014 19:48:06 +0000</created>
                <updated>Tue, 6 Dec 2022 05:10:43 +0000</updated>
                                            <version>2.6.0-rc0</version>
                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3590142" author="david.percy" created="Fri, 29 Jan 2021 18:20:20 +0000"  >&lt;p&gt;This behavior has changed now that we allow expressions: .find({}, {foo: &quot;bar&quot;}) treats &quot;bar&quot; as a constant expression, not a &quot;yes, include this field&quot; flag.&lt;/p&gt;

&lt;p&gt;But there are still some confusing cases: .find({}, {foo: 5}) treats 5 as a flag, not an expression.&#160; &lt;br class=&quot;atl-forced-newline&quot; /&gt;{$project: {foo: 5}} does the same thing.&lt;/p&gt;

&lt;p&gt;Is it still worth banning some of these cases, or is that too big a language change?&lt;/p&gt;</comment>
                            <comment id="505148" author="rassi@10gen.com" created="Tue, 25 Feb 2014 20:28:19 +0000"  >&lt;p&gt;Suggest that CanonicalQuery validates projection values similarly to sort.&lt;/p&gt;

&lt;p&gt;Current allow list for sort: -1, 1, {$meta: &quot;textScore&quot;}&lt;br/&gt;
Suggested allow list for projection: 0, 1, false, true, {$meta: &quot;textScore&quot;}&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dan%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;dan@10gen.com&quot;&gt;dan@10gen.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benety.goh&quot; class=&quot;user-hover&quot; rel=&quot;benety.goh&quot;&gt;benety.goh&lt;/a&gt;&lt;/p&gt;</comment>
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