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    <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>[DOCS-14214] Investigate changes in SERVER-54299: Mark OrMatchExpression::matchesSingleElement as dead code</title>
                <link>https://jira.mongodb.org/browse/DOCS-14214</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    We have marked one of the methods related to $or operator as dead code. We are certain that no user query can lead to the execution of this method, so this change should not impact anything.&lt;br/&gt;
Still, we would like other teams to be informed just in case.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    During the discussion of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52914&quot; title=&quot;Support positional projection operator ($) in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52914&quot;&gt;&lt;del&gt;SERVER-52914&lt;/del&gt;&lt;/a&gt;, we have noticed that &lt;tt&gt;OrMatchExpression::matchesSingleElement&lt;/tt&gt; has a different handling of &lt;tt&gt;MatchDetails&lt;/tt&gt; object compared to &lt;tt&gt;OrMatchExpression::matches&lt;/tt&gt;. During the investigation we have started to wonder if this method ever gets called. It looks like query parser simply does not allow a query where this method would be called.&lt;/p&gt;

&lt;p&gt;Our coverage report for &lt;a href=&quot;https://mongo-cc.corp.mongodb.com/data?build_id=Wkly-2019-07-12&amp;amp;git_hash=67b760c562d7f189bad589841b4dcd14acf702d9&amp;amp;file=src%2Fmongo%2Fdb%2Fmatcher%2Fexpression_tree.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;July 2019&lt;/a&gt; says that this method is not covered by tests. Recent &lt;a href=&quot;https://evergreen.mongodb.com/version/601983ac32f41723fcf4d042&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Evergreen patch&lt;/a&gt; where this method was replaced with &lt;tt&gt;MONGO_UNREACHABLE&lt;/tt&gt; passes without any failures.&lt;/p&gt;

&lt;p&gt;It is highly unlikely that our tests do not cover some case where &lt;tt&gt;OrMatchExpression::matchesSingleElement&lt;/tt&gt; is used, so we concluded that this is a dead code. We should replace the body of this method with &lt;tt&gt;MONGO_UNREACHABLE_TASSERT&lt;/tt&gt; to avoid further confusion.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1620388">DOCS-14214</key>
            <summary>Investigate changes in SERVER-54299: Mark OrMatchExpression::matchesSingleElement as dead code</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Feb 2021 10:06:19 +0000</created>
                <updated>Mon, 13 Nov 2023 17:58:21 +0000</updated>
                            <resolved>Fri, 12 Feb 2021 18:19:26 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
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