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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-25510] Differentiate between Inclusion and Computed projections.</title>
                <link>https://jira.mongodb.org/browse/SERVER-25510</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Aggregation&apos;s &lt;tt&gt;$project&lt;/tt&gt; stage can be either an &apos;inclusion&apos; projection or an &apos;exclusion&apos; projection. An exclusion projection is allowed to specify only exclusions of paths, whereas an inclusion projection is allowed to include fields, but also add/replace fields with &apos;computed&apos; values. We have separate classes to represent/execute these different kinds of projections: &lt;tt&gt;ParsedInclusionProjection&lt;/tt&gt; and &lt;tt&gt;ParsedExclusionProjection&lt;/tt&gt;, which have trees of &lt;tt&gt;InclusionNodes&lt;/tt&gt; and &lt;tt&gt;ExclusionNodes&lt;/tt&gt; respectively.&lt;/p&gt;

&lt;p&gt;The oddity of this design is that an &lt;tt&gt;InclusionNode&lt;/tt&gt; is really a hybrid of included and computed paths, and is unable to differentiate between the two. This became a problem when we added the &lt;tt&gt;$addFields&lt;/tt&gt; stage, which strictly adds or replaces fields/paths. Because of the hybrid responsibilities of the &lt;tt&gt;InclusionNode&lt;/tt&gt;, we are unable to take advantage of certain optimizations such as extracting which fields are going to be added/replaced during an &lt;tt&gt;$addFields&lt;/tt&gt; stage. It would also be a lot cleaner and easier to think about if there were three types of nodes corresponding to the three types of transformations possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="307660">SERVER-25510</key>
            <summary>Differentiate between Inclusion and Computed projections.</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="carly.robison">Carly Robison</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Aug 2016 18:52:24 +0000</created>
                <updated>Tue, 6 Dec 2022 04:19:25 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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