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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-62027] Visitor and walker mechanism for Pipeline/DocumentSource</title>
                <link>https://jira.mongodb.org/browse/SERVER-62027</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket involves designing a solution to work with enterprise-only stages as well as getting rid of the dynamic casts that were carried over from the POC.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1948122">SERVER-62027</key>
            <summary>Visitor and walker mechanism for Pipeline/DocumentSource</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="ben.shteinfeld@mongodb.com">Ben Shteinfeld</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Dec 2021 19:00:07 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:06 +0000</updated>
                            <resolved>Wed, 14 Dec 2022 15:33:43 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5052829" author="xgen-internal-githook" created="Tue, 13 Dec 2022 22:09:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ben Shteinfeld&apos;, &apos;email&apos;: &apos;ben.shteinfeld@mongodb.com&apos;, &apos;username&apos;: &apos;bshteinfeld&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62027&quot; title=&quot;Visitor and walker mechanism for Pipeline/DocumentSource&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62027&quot;&gt;&lt;del&gt;SERVER-62027&lt;/del&gt;&lt;/a&gt; Introduce a mechanism for defining visitors over DocumentSources&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/df32b43a03177b6cb9295549c6f8c5ca384ef82a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/df32b43a03177b6cb9295549c6f8c5ca384ef82a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4666068" author="hana.pearlman" created="Fri, 8 Jul 2022 13:57:30 +0000"  >&lt;p&gt;Un-assigning from myself for now since this isn&apos;t scheduled for several weeks&lt;/p&gt;</comment>
                            <comment id="4344022" author="david.storch" created="Wed, 9 Feb 2022 00:19:55 +0000"  >&lt;p&gt;It&apos;s not necessarily urgent. This is just generic infrastructure that you could imagine plenty of uses for. It seems worthwhile to have a solid implementation of this, since it is relatively fundamental.&lt;/p&gt;

&lt;p&gt;In addition to the improvements listed in the description, do we need a solution for walking sub-pipelines of $lookup and $unionWith?&lt;/p&gt;</comment>
                            <comment id="4341743" author="nicholas.zolnierz" created="Tue, 8 Feb 2022 12:58:06 +0000"  >&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; In my opinion I don&apos;t think its urgent, what&apos;s wrong with temporarily keeping the dynamic casts?&lt;/p&gt;</comment>
                            <comment id="4339307" author="david.storch" created="Mon, 7 Feb 2022 15:35:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt; I wonder if we should schedule this one even thought the ABT project has been put on hold? This seems like important followup after merging the optimizer branch.&lt;/p&gt;</comment>
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            <issuekey id="2205452">SERVER-71943</issuekey>
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