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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-66846] Translate $project by walking over ProjectionAST</title>
                <link>https://jira.mongodb.org/browse/SERVER-66846</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would replace the current approach, which examines the projection_executor instead. This seems like it will require modifying DocumentSourceSingleDocTransform to store the original AST instead of throwing it away e.g. &lt;a href=&quot;https://github.com/10gen/mongo/blob/aa40f5e7c0d821915c6225c1eb2001124857d62d/src/mongo/db/pipeline/document_source_project.cpp#L66-L104&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2056963">SERVER-66846</key>
            <summary>Translate $project by walking over ProjectionAST</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="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 May 2022 18:25:53 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:36 +0000</updated>
                            <resolved>Tue, 20 Sep 2022 17:11:15 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4992738" author="xgen-internal-githook" created="Fri, 18 Nov 2022 13:27:39 +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-68516&quot; title=&quot;[CQF] Always translate projections to ABT using ProjectionExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68516&quot;&gt;&lt;del&gt;SERVER-68516&lt;/del&gt;&lt;/a&gt; Revert back to always using `ProjectionExecutor` to translate projections to ABT&lt;/p&gt;

&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66846&quot; title=&quot;Translate $project by walking over ProjectionAST&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66846&quot;&gt;&lt;del&gt;SERVER-66846&lt;/del&gt;&lt;/a&gt;, we started using `ProjectionAST` as the input to ABT translations for inclusion/exclusion projections. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68516&quot; title=&quot;[CQF] Always translate projections to ABT using ProjectionExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68516&quot;&gt;&lt;del&gt;SERVER-68516&lt;/del&gt;&lt;/a&gt; was originally intended to update `$addFields` and `$replaceRoot` projections to also use the `ProjectionAST` codepath. However, we realized that `ProjectionAST` is not capable of representing these projections. So rather than losing functionality or maintaining two translation codepaths, we revert back to using `ProjectionExecutor` for translation.&lt;/p&gt;

&lt;p&gt;Note this patch is not a clean revert of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66846&quot; title=&quot;Translate $project by walking over ProjectionAST&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66846&quot;&gt;&lt;del&gt;SERVER-66846&lt;/del&gt;&lt;/a&gt;. The diffs are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Keeping the tests which the original commit introduced&lt;/li&gt;
	&lt;li&gt;Adding additional fallback logic for agg expressions and ensuring that the `_rootReplacementExpression` of a `ProjectionExecutor` is checked during the fallback mechanism. This was discovered because of a new test-case, added after  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66846&quot; title=&quot;Translate $project by walking over ProjectionAST&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66846&quot;&gt;&lt;del&gt;SERVER-66846&lt;/del&gt;&lt;/a&gt;, for falling back to classic when a find query has a positional projection.&lt;/li&gt;
	&lt;li&gt;Updated comments&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/35c1d35f4870510bc0923e3db49eb026dcf93f32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/35c1d35f4870510bc0923e3db49eb026dcf93f32&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4842363" author="xgen-internal-githook" created="Tue, 20 Sep 2022 16:20:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Hana Pearlman&apos;, &apos;email&apos;: &apos;hana.pearlman@mongodb.com&apos;, &apos;username&apos;: &apos;HanaPearlman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66846&quot; title=&quot;Translate $project by walking over ProjectionAST&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66846&quot;&gt;&lt;del&gt;SERVER-66846&lt;/del&gt;&lt;/a&gt; Translate simple inclusion and exclusion $project by walking over ProjectionAST&lt;/p&gt;

&lt;p&gt;Co-authored-by: Emily Wang emily.wang@mongodb.com&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f8cd4b9e0099770650b8bbd7e18203cd73033a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f8cd4b9e0099770650b8bbd7e18203cd73033a1&lt;/a&gt;&lt;/p&gt;</comment>
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