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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-42929] Re-implement $replaceRoot in terms of root-replacing projection expression</title>
                <link>https://jira.mongodb.org/browse/SERVER-42929</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once we have the execution machinery that allows projections to replace the root of a document with the result of an Expression, we can re-implement $replaceRoot in terms of this machinery.&lt;/p&gt;</description>
                <environment></environment>
        <key id="901480">SERVER-42929</key>
            <summary>Re-implement $replaceRoot in terms of root-replacing projection expression</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Aug 2019 19:16:49 +0000</created>
                <updated>Tue, 19 Nov 2019 18:26:26 +0000</updated>
                            <resolved>Tue, 19 Nov 2019 18:26:26 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2548162" author="david.storch" created="Tue, 19 Nov 2019 00:21:42 +0000"  >&lt;p&gt;No objections. Let&apos;s close as &quot;Won&apos;t Do&quot;.&lt;/p&gt;</comment>
                            <comment id="2548061" author="ian.boros" created="Mon, 18 Nov 2019 23:12:32 +0000"  >&lt;p&gt;Given that we do not serialize root replacement expressions in the ProjectionExecutor, I think replacing &lt;tt&gt;ReplaceRootTransformation&lt;/tt&gt; (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/document_source_replace_root.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) would end up adding complexity.&lt;/p&gt;

&lt;p&gt;Another option is to keep ReplaceRootTransformation, and have it delegate to the ProjectionExecutor for &quot;execution.&quot; However, there&apos;s clearly a lot of care put into $replaceRoot reporting errors correctly (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5f4028944b1a08d7d07747a04101b48dce7ea099/src/mongo/db/pipeline/document_source_replace_root.cpp#L45-L75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). For us to switch over to the ProjectionExecutor would involve plumbing some of the information like the stage name into ProjectionExecutor, which I&apos;d like to avoid.&lt;/p&gt;

&lt;p&gt;I&apos;d like us to consider closing this as &quot;Won&apos;t Fix&quot; rather than adding complexity to our codebase for what I would argue is little/no benefit.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; would either of you object?&lt;/p&gt;</comment>
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            <issuekey id="879831">SERVER-42495</issuekey>
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