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    <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>[DOCS-3874] Add warning about undefined behavior cases for positional projection operator ($)</title>
                <link>https://jira.mongodb.org/browse/DOCS-3874</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Refers to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14662&quot; title=&quot;Positional projection queries (and positional update ops) should fail with error if multiple arrays encountered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14662&quot;&gt;&lt;del&gt;SERVER-14662&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The behavior of the positional projection operator is undefined when there are multiple predicates over the projected array which are not joined by an $elemMatch. (Say the positional projection is {&quot;a.b.$&quot;: 1}, then the &quot;projected array&quot; would be &quot;a.b&quot;.)&lt;/p&gt;

&lt;p&gt;The behavior is undefined in that you can&apos;t count on which array element will be returned by the projection. One of the predicates over the projected array will be used to match the nested document to project; if there is more than one predicate, then you don&apos;t know which one will be used for the match.&lt;/p&gt;

&lt;p&gt;Let&apos;s add a warning to the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/projection/positional/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;positional projection documentation&lt;/a&gt; in order to discourage users from relying on this undefined behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="151104">DOCS-3874</key>
            <summary>Add warning about undefined behavior cases for positional 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="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 6 Aug 2014 16:07:33 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:50 +0000</updated>
                            <resolved>Mon, 15 Sep 2014 21:58:42 +0000</resolved>
                                                    <fixVersion>v1.3.11</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
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