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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-28556] positional operator in projection fails when combined with other array fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-28556</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Combining a positional operator in the projection with some other array dotted field returns:&lt;br/&gt;
&quot;BadValue: positional operator element mismatch&quot;&lt;/p&gt;

&lt;p&gt;Example:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;db.collection.find({ &quot;my_array&quot; : { $elemMatch : { &quot;key1&quot; : &quot;value1&quot;, &quot;key2&quot; : &quot;value2&quot; } } }, { &quot;my_array.$&quot; : 1, &quot;some_other_array.other_field&quot; : 1 })&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;returns the error message.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;db.collection.find({ &quot;my_array&quot; : { $elemMatch : { &quot;key1&quot; : &quot;value1&quot;, &quot;key2&quot; : &quot;value2&quot; } } }, { &quot;my_array.$&quot; : 1 })&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;returns the expected result.&lt;/p&gt;

&lt;p&gt;According to the docs at:&lt;br/&gt;
&lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/projection/positional/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/projection/positional/&lt;/a&gt;&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Only one array field, the one being limited with the $ projection operator, should appear in the &lt;b&gt;query document&lt;/b&gt;. Additional array fields in the query document may lead to undefined behavior&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;But there is no similar limit on the projection document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="369394">SERVER-28556</key>
            <summary>positional operator in projection fails when combined with other array fields</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="4">Incomplete</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="Marmor">Mor [X]</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Mar 2017 09:22:39 +0000</created>
                <updated>Wed, 31 May 2017 21:23:31 +0000</updated>
                            <resolved>Thu, 4 May 2017 20:41:27 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1564918" author="mark.agarunov" created="Thu, 4 May 2017 20:41:12 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Marmor&quot; class=&quot;user-hover&quot; rel=&quot;Marmor&quot;&gt;Marmor&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1537553" author="ramon.fernandez" created="Fri, 31 Mar 2017 00:01:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Marmor&quot; class=&quot;user-hover&quot; rel=&quot;Marmor&quot;&gt;Marmor&lt;/a&gt;, in what version of MongoDB are you seeing this behavior?&lt;/p&gt;</comment>
                            <comment id="1536773" author="marmor" created="Thu, 30 Mar 2017 09:25:47 +0000"  >&lt;p&gt;A workaround is to use $elemMatch in the projection, and copy the same element query document used in the query for the projection, that works but cumbersome.&lt;br/&gt;
Also, this workaround doesn&apos;t help if you want a specific field within the element, such as: &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;p/&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;1. Create a collection with documents containing to array fields with inner documents in each.&lt;br/&gt;
2. Query for: &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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