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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-14770] warn when more than one array is used in a query with $ projection operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-14770</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When you query for a value on each of two arrays, both with positional operators, the $ projection operator can get pretty confused but smoothly performs the wrong operation.&lt;/p&gt;

&lt;p&gt;Steps to reproduce:&lt;/p&gt;

&lt;p&gt;Perform the following operations in the shell:&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;   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;db.foo.insert( { a : [5, 6, 7, 8], b : [ 11, 12, 13, 14] } )&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;db.foo.find( { a : 7, b : 11 }, { &quot;a.$&quot; : 1 , _id : 0 } &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;Expected result: &lt;/p&gt;
{ &quot;a&quot; : 7 }
&lt;p&gt; or an exception&lt;/p&gt;

&lt;p&gt;Actual result : &lt;/p&gt;
{ &quot;a&quot; : 5 }


&lt;p&gt;Related documentation: &lt;/p&gt;

&lt;p&gt;The following doc tells me not to do exactly what I did: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/#proj._S_&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/operator/projection/positional/#proj._S_&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&quot;Only one array field can appear in the query document; i.e. the following query is incorrect:&quot; (then the example shows me exactly what I did), but this is clearly a case where either an exception should be thrown, or else the $ operator should be made smarter.&lt;/p&gt;</description>
                <environment></environment>
        <key id="150533">SERVER-14770</key>
            <summary>warn when more than one array is used in a query with $ projection operator</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="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="william.cross">William Cross</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Aug 2014 21:26:27 +0000</created>
                <updated>Sat, 2 Aug 2014 13:38:50 +0000</updated>
                            <resolved>Sat, 2 Aug 2014 13:38:35 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="679569" author="scotthernandez" created="Sat, 2 Aug 2014 13:38:35 +0000"  >&lt;p&gt;dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1013&quot; title=&quot;positional $ operator field mismatch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1013&quot;&gt;&lt;del&gt;SERVER-1013&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="679251" author="ramon.fernandez" created="Fri, 1 Aug 2014 22:04:33 +0000"  >&lt;p&gt;According to &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/#definition&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the documentation&lt;/a&gt;, only one array can appear on the query document, so&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;db.foo.find( { a : 7, b : 11 }, { &quot;a.$&quot; : 1 , _id : 0 })&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;is incorrect if both &lt;tt&gt;a&lt;/tt&gt; and &lt;tt&gt;b&lt;/tt&gt; are arrays. &lt;/p&gt;</comment>
                            <comment id="679215" author="william.cross" created="Fri, 1 Aug 2014 21:27:41 +0000"  >&lt;p&gt;By the way, the following query happily throws an exception:&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;db.foo.find( { &quot;a&quot;: 7 } , { &quot;b.$&quot;: 1, _id: 0})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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            <issuekey id="11774">SERVER-1013</issuekey>
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