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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>[SERVER-70222] Use MONGO_UNREACHABLE for unimplemented VirtualCollectionImpl functions</title>
                <link>https://jira.mongodb.org/browse/SERVER-70222</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ec666678f24a974d3000d499db3850733e6c9dfe/src/mongo/db/catalog/virtual_collection_impl.h#L531-L532&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unimplementedTassert&lt;/a&gt;  helper that is use in most function definitions in VirtualCollectionImpl has a few problems:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;It is not marked with MONGO_COMPILER_NORETURN, so each function has to return something.&lt;/li&gt;
	&lt;li&gt;The tassert code is not unique, so it is not possible to tell which function was called.&lt;/li&gt;
	&lt;li&gt;A backtrace is not generated which means it is impossible to tell which unimplemented function was called.&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;MONGO_UNREACHABLE solves these problems. I also don&apos;t believe that calling unimplemented functions is expected to be a common problem in our code that we need to use tassert to protect the process from crashing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2152204">SERVER-70222</key>
            <summary>Use MONGO_UNREACHABLE for unimplemented VirtualCollectionImpl functions</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="13202">Works as Designed</resolution>
                                        <assignee username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Oct 2022 12:09:37 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:53 +0000</updated>
                            <resolved>Thu, 27 Oct 2022 16:16:37 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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