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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25231] Create base class for Expressions with named arguments</title>
                <link>https://jira.mongodb.org/browse/SERVER-25231</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have the base class &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.10/src/mongo/db/pipeline/expression.h#L314&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ExpressionNary&lt;/tt&gt;&lt;/a&gt; which nicely abstracts away a lot of the parsing and other mechanical parts of the Expression interface for expressions of the form {&lt;tt&gt;$expressionName: [array, of, arguments]&lt;/tt&gt;}. We should have a similar base class for expressions of the form {&lt;tt&gt;$expressionName: {arg1: val1, arg2: val2&lt;/tt&gt;}.&lt;/p&gt;

&lt;p&gt;This will also help prevent a class of bugs where an expression forgets to implement serialize, or forgets to optimize it&apos;s arguments, etc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="303395">SERVER-25231</key>
            <summary>Create base class for Expressions with named arguments</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 22 Jul 2016 19:27:41 +0000</created>
                <updated>Tue, 6 Dec 2022 04:20:35 +0000</updated>
                            <resolved>Thu, 18 Mar 2021 00:53:45 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3670420" author="jacob.evans" created="Thu, 18 Mar 2021 00:53:45 +0000"  >&lt;p&gt;A base class modification was introduced for these classes already with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40526&quot; title=&quot;Make agg Expressions walkable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40526&quot;&gt;&lt;del&gt;SERVER-40526&lt;/del&gt;&lt;/a&gt; which makes accessing named members much easier. The specific concern to do with unifying parsing is no longer especially relevant as we move to put parsing functionality outside the class hierarchy into its own framework.&lt;/p&gt;</comment>
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