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    <title>MongoDB Jira</title>
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    <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-49740] Allow _id inclusion node presence in exclusion projection AST</title>
                <link>https://jira.mongodb.org/browse/SERVER-49740</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Feel free to also refactor the projection_ast API.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1414925">SERVER-49740</key>
            <summary>Allow _id inclusion node presence in exclusion projection AST</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jacob.evans@mongodb.com">Jacob Evans</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Jul 2020 17:21:28 +0000</created>
                <updated>Tue, 21 Jul 2020 17:18:10 +0000</updated>
                            <resolved>Tue, 21 Jul 2020 17:18:10 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="3293063" author="ian.boros" created="Mon, 20 Jul 2020 18:36:08 +0000"  >&lt;p&gt;For reference, this ticket is referring to behavior where presence of any &quot;_id&quot; field in an exclusion projection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4123eb7e7fde047ca1f1b396712d41a3de8a89f1/src/mongo/db/exec/projection_executor_builder.cpp#L233&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is treated as an exclusion&lt;/a&gt;. The reason this does not cause a bug in released versions is that the projection parser ensures that exclusion projection trees &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d0e0220787fa127e0fae9d0c9f691316bd1eb6db/src/mongo/db/query/projection_parser.cpp#L624-L628&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;never have an _id field&lt;/a&gt;. This makes much of the analysis code simpler, because there are no special cases for _id. Unfortunately it also means that manually building a projection AST for an exclusion projection with _id: true and then converting it to an execution tree results in the wrong execution tree.&lt;/p&gt;</comment>
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