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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-71839] Add &apos;canAppearOnlyOnce&apos; stage constraint and stage-specific position check</title>
                <link>https://jira.mongodb.org/browse/SERVER-71839</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This impacts $geoNear and $unpackBucket stages.&lt;/p&gt;

&lt;p&gt;Until now $unpackBucket was the only stage that can appear only once. With introduction of the $changeStreamSplitLargeEvents stage, both stages should use the same constraint enforcement mechanism.&lt;/p&gt;

&lt;p&gt;Until now $geoNear stage was the only stage using special position requirement &apos;kFirstAfterOptimization&apos;. $changeStreamSplitLargeEvents needs yet another special position check after optimization, so we will generalize this approach.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2202303">SERVER-71839</key>
            <summary>Add &apos;canAppearOnlyOnce&apos; stage constraint and stage-specific position check</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="13201">Fixed</resolution>
                                        <assignee username="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                    </labels>
                <created>Mon, 5 Dec 2022 15:57:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:29:43 +0000</updated>
                            <resolved>Mon, 13 Feb 2023 12:56:05 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5485011" author="xgen-internal-githook" created="Thu, 8 Jun 2023 14:43:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71839&quot; title=&quot;Add &amp;#39;canAppearOnlyOnce&amp;#39; stage constraint and stage-specific position check&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71839&quot;&gt;&lt;del&gt;SERVER-71839&lt;/del&gt;&lt;/a&gt; Add appear-once and custom position stage constraints&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/902a9171c954cf3ce4abfb73a60a4098f3d11534&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/902a9171c954cf3ce4abfb73a60a4098f3d11534&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5185435" author="xgen-internal-githook" created="Fri, 10 Feb 2023 05:10:43 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71839&quot; title=&quot;Add &amp;#39;canAppearOnlyOnce&amp;#39; stage constraint and stage-specific position check&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71839&quot;&gt;&lt;del&gt;SERVER-71839&lt;/del&gt;&lt;/a&gt; Add appear-once and custom position stage constraints&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1de0264c6f0d48a21339e6a6a6a54b6b1e916f85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1de0264c6f0d48a21339e6a6a6a54b6b1e916f85&lt;/a&gt;&lt;/p&gt;</comment>
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