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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>[DOCS-14609] [Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage</title>
                <link>https://jira.mongodb.org/browse/DOCS-14609</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;    The change is explained here: &lt;a href=&quot;https://docs.google.com/document/d/1QIgFj_lc0AlH2fPCAi4QdgPhXFGqz--LjpBp4KDff-Q&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1QIgFj_lc0AlH2fPCAi4QdgPhXFGqz--LjpBp4KDff-Q&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We might want to reflect this change in our documentation if we already mention field ordering somewhere in the documentation. However, it&apos;s best to avoid having any guarantees for the field ordering, as it might change in the future. As a matter of fact, it&apos;s best to explicitly mention in the documentation that there&apos;s no guarantee for the field ordering and user applications should not depend on it.&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;    The behavior of $project in the classic engine is to order projection fields ahead of fields which require expression evaluation. SBE engine doesn&apos;t seemed to follow this convention, which is producing failures on the aggregation fuzzers. We should fix the behavior to match that of classic engine. &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="1802430">DOCS-14609</key>
            <summary>[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage</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="9">Done</resolution>
                                        <assignee username="jason.price@mongodb.com">Jason Price</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Jun 2021 15:46:55 +0000</created>
                <updated>Mon, 13 Nov 2023 17:51:34 +0000</updated>
                            <resolved>Mon, 27 Sep 2021 23:59:17 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</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>2</watches>
                                                                                                                <comments>
                            <comment id="4088031" author="xgen-internal-githook" created="Mon, 27 Sep 2021 22:38:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jason-price-mongodb&apos;, &apos;email&apos;: &apos;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14609&quot; title=&quot;[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14609&quot;&gt;&lt;del&gt;DOCS-14609&lt;/del&gt;&lt;/a&gt; SBE order projection fields&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d3db9398e0931604a60f702e35d6054bb9387c84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d3db9398e0931604a60f702e35d6054bb9387c84&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4087999" author="xgen-internal-githook" created="Mon, 27 Sep 2021 22:19:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jason-price-mongodb&apos;, &apos;email&apos;: &apos;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14609&quot; title=&quot;[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14609&quot;&gt;&lt;del&gt;DOCS-14609&lt;/del&gt;&lt;/a&gt; SBE order projection fields&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5a792286ca38a7f538d1c8b96eb575f886257fd7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5a792286ca38a7f538d1c8b96eb575f886257fd7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4087975" author="xgen-internal-githook" created="Mon, 27 Sep 2021 22:07:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jason-price-mongodb&apos;, &apos;email&apos;: &apos;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14609&quot; title=&quot;[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14609&quot;&gt;&lt;del&gt;DOCS-14609&lt;/del&gt;&lt;/a&gt; SBE order projection fields&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/aaaf33762458d539d2fa9b16b2096c2f940fe865&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/aaaf33762458d539d2fa9b16b2096c2f940fe865&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4087906" author="xgen-internal-githook" created="Mon, 27 Sep 2021 21:42:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jason-price-mongodb&apos;, &apos;email&apos;: &apos;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14609&quot; title=&quot;[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14609&quot;&gt;&lt;del&gt;DOCS-14609&lt;/del&gt;&lt;/a&gt; SBE order projection fields&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ae0e219fc95da8a4e853a840f3cf80e07cdd2822&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ae0e219fc95da8a4e853a840f3cf80e07cdd2822&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4087407" author="xgen-internal-githook" created="Mon, 27 Sep 2021 18:43:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jason-price-mongodb&apos;, &apos;email&apos;: &apos;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14609&quot; title=&quot;[Server] Investigate changes in SERVER-57741: SBE should order projection fields ahead of expression fields in a $project stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14609&quot;&gt;&lt;del&gt;DOCS-14609&lt;/del&gt;&lt;/a&gt; SBE order projection fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/293425ddc75d383774e1c956e74500d585c94dea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/293425ddc75d383774e1c956e74500d585c94dea&lt;/a&gt;&lt;/p&gt;</comment>
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