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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-76826] $merge doesn&apos;t work with document that has dollar fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-76826</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if the client document for merge has the first field starting with &apos;$&apos;, it may be treated as &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/pipeline/document_source_merge.h#L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a modifier style update&lt;/a&gt;, even when the intention is always a replacement style update. This triggered the invariant in the linked BF.&lt;/p&gt;

&lt;p&gt;However, even if we fix the invariant, supporting $merge with dollar fields across the board is harder than expected. For example, if the merge strategy results in a modifier style update, having a dollar field in the updated document will trigger &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/update/modifier_node.cpp#L362&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;validation assertion&lt;/a&gt; down the line. Even if it&apos;s a replacement style update, it still may trigger &lt;a href=&quot;https://github.com/10gen/mongo/blob/761e633ecc7382b9115cddf830dd625956e3a713/src/mongo/db/update/object_replace_executor.cpp#L111-L114&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;validation assertion&lt;/a&gt; after experiments.&lt;/p&gt;

&lt;p&gt;To be relatively consistent instead of only supporting dollar fields in some combination of merge strategies, we can also consider rejecting the dollar fields except for the pipeline style update. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2331593">SERVER-76826</key>
            <summary>$merge doesn&apos;t work with document that has dollar 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="13201">Fixed</resolution>
                                        <assignee username="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 May 2023 23:46:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:00 +0000</updated>
                            <resolved>Thu, 11 May 2023 20:55:14 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                    <fixVersion>5.0.19</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5421215" author="xgen-internal-githook" created="Fri, 12 May 2023 16:39:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76826&quot; title=&quot;$merge doesn&amp;#39;t work with document that has dollar fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76826&quot;&gt;&lt;del&gt;SERVER-76826&lt;/del&gt;&lt;/a&gt; Fix invariant failure for $merge with dollar fields&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f59655be727acb3c33b4183d2d70ceebb96fede2)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d78cf7f7870d10bb15b907635c155419e7edc546&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d78cf7f7870d10bb15b907635c155419e7edc546&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5420945" author="xgen-internal-githook" created="Fri, 12 May 2023 15:35:47 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76826&quot; title=&quot;$merge doesn&amp;#39;t work with document that has dollar fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76826&quot;&gt;&lt;del&gt;SERVER-76826&lt;/del&gt;&lt;/a&gt; Fix invariant failure for $merge with dollar fields&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f59655be727acb3c33b4183d2d70ceebb96fede2)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/73825cf138d0b431ed6a6f1eb1de9daa0618c58d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/73825cf138d0b431ed6a6f1eb1de9daa0618c58d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5420396" author="xgen-internal-githook" created="Fri, 12 May 2023 12:50:17 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76826&quot; title=&quot;$merge doesn&amp;#39;t work with document that has dollar fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76826&quot;&gt;&lt;del&gt;SERVER-76826&lt;/del&gt;&lt;/a&gt; Fix invariant failure for $merge with dollar fields&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f59655be727acb3c33b4183d2d70ceebb96fede2)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/803ab4b0955c48f635106db22d8302914ea49122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/803ab4b0955c48f635106db22d8302914ea49122&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5418873" author="xgen-internal-githook" created="Thu, 11 May 2023 19:24:14 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76826&quot; title=&quot;$merge doesn&amp;#39;t work with document that has dollar fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76826&quot;&gt;&lt;del&gt;SERVER-76826&lt;/del&gt;&lt;/a&gt; Fix invariant failure for $merge with dollar fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f59655be727acb3c33b4183d2d70ceebb96fede2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f59655be727acb3c33b4183d2d70ceebb96fede2&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2337257">SERVER-76999</issuekey>
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