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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-74531] Exclude projection messed up the object fields order</title>
                <link>https://jira.mongodb.org/browse/SERVER-74531</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;SBE re-orders the fields in bson with the project stage {$project: {&quot;obj.obj.obj.obj.array&quot;: 0}}.&lt;/p&gt;

&lt;p&gt;In SBE&apos;s implementation, the object {obj: xx, any:xx } is first copied without specific field excluded from projections (obj in this case), then append the field back if only part of the object is excluded (only obj.array is excluded in this case). With this algorithm, the fields order is changed after projection stage.&lt;/p&gt;

&lt;p&gt;When there is a $lookup stage with self-lookup after the project stage, the re-ordered object can&apos;t be matched to the original object, and output incorrect result.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2279231">SERVER-74531</key>
            <summary>Exclude projection messed up the object fields order</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="andrew.paroski@mongodb.com">Drew Paroski</assignee>
                                    <reporter username="zixuan.zhuang@mongodb.com">Zixuan Zhuang</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Mar 2023 07:11:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:27 +0000</updated>
                            <resolved>Tue, 25 Apr 2023 18:34:20 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5415866" author="xgen-internal-githook" created="Wed, 10 May 2023 19:27:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Drew Paroski&apos;, &apos;email&apos;: &apos;drew.paroski@mongodb.com&apos;, &apos;username&apos;: &apos;paroski&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74531&quot; title=&quot;Exclude projection messed up the object fields order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74531&quot;&gt;&lt;del&gt;SERVER-74531&lt;/del&gt;&lt;/a&gt; Make MakeObjStage respect original field order&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e4af7edec98c1b05b2b16fd4e664777f6a5cb398)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2d601b85b38b06e28bdb4fd5c70c4a4973e84f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2d601b85b38b06e28bdb4fd5c70c4a4973e84f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5360491" author="JIRAUSER1265798" created="Wed, 19 Apr 2023 20:31:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kelsey.schubert%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kelsey.schubert@mongodb.com&quot;&gt;kelsey.schubert@mongodb.com&lt;/a&gt; 6.3 and 7.0 are affected. Prior to 6.3, SBE is not enabled by default so it depends on if the query with $lookup and $project uses SBE.&lt;/p&gt;</comment>
                            <comment id="5360408" author="xgen-internal-githook" created="Wed, 19 Apr 2023 19:58:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Drew Paroski&apos;, &apos;email&apos;: &apos;drew.paroski@mongodb.com&apos;, &apos;username&apos;: &apos;paroski&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74531&quot; title=&quot;Exclude projection messed up the object fields order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74531&quot;&gt;&lt;del&gt;SERVER-74531&lt;/del&gt;&lt;/a&gt; Make MakeObjStage respect original field order&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e4af7edec98c1b05b2b16fd4e664777f6a5cb398&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e4af7edec98c1b05b2b16fd4e664777f6a5cb398&lt;/a&gt;&lt;/p&gt;</comment>
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