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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-42421] Plug in BSON -&gt; ProjectionAST parser to find command path</title>
                <link>https://jira.mongodb.org/browse/SERVER-42421</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="875827">SERVER-42421</key>
            <summary>Plug in BSON -&gt; ProjectionAST parser to find command path</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jul 2019 17:40:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:44 +0000</updated>
                            <resolved>Mon, 23 Sep 2019 22:54:46 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2429128" author="xgen-internal-githook" created="Mon, 23 Sep 2019 22:04:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;puppyofkosh&apos;, &apos;email&apos;: &apos;ian.boros@mongodb.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42421&quot; title=&quot;Plug in BSON -&amp;gt; ProjectionAST parser to find command path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42421&quot;&gt;&lt;del&gt;SERVER-42421&lt;/del&gt;&lt;/a&gt; Create a projection_ast::Projection during construction of the CanonicalQuery&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dad2a236fa7a10ce6795827688b019a1d2a6f78c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dad2a236fa7a10ce6795827688b019a1d2a6f78c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2344284" author="ian.boros" created="Thu, 25 Jul 2019 17:40:49 +0000"  >&lt;p&gt;Talk to me before starting this&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1073686">DOCS-13320</issuekey>
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                            <customfieldvalue>There were a number of small changes to the projection language made by this ticket:&lt;br/&gt;
&lt;br/&gt;
1) Projecting on top-level dollar prefixed fields in find() is now banned, with a few exceptions ($sortKey, $recordId, for example) that are for internal use by mongos.&lt;br/&gt;
Example:&lt;br/&gt;
db.c.find({a: 1}, {$foobar: 1}) // Now illegal&lt;br/&gt;
&lt;br/&gt;
2) Performing a projection on a field that also has the $slice expression applied to it is illegal.&lt;br/&gt;
Example:&lt;br/&gt;
db.c.find({}, {&#8220;comments&#8221;: {$slice: 1}, &#8220;comments.id&#8221;: 1}) // Illegal&lt;br/&gt;
&lt;br/&gt;
3) $slice may not be used with positional projection on the same field.&lt;br/&gt;
Example:&lt;br/&gt;
db.c.find({&amp;quot;x.a&amp;quot;: 1}, {&amp;quot;x.$&amp;quot;: {$slice: -1}}) // Illegal&lt;br/&gt;
&lt;br/&gt;
4) It is now illegal to project an empty field name</customfieldvalue>

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