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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>[DOCS-13321] Investigate changes in SERVER-42423: Use ProjectionExecutor in ProjectionStageDefault</title>
                <link>https://jira.mongodb.org/browse/DOCS-13321</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    The following changes to the projection language were made under this ticket:&lt;/p&gt;


&lt;p&gt;1) In 4.2 the following projection:&lt;br/&gt;
{a: &#8220;foo&#8221;}&lt;br/&gt;
means &quot;include a&quot;.&lt;/p&gt;

&lt;p&gt;In 4.4 this means return a set to the string &quot;foo&quot;.&lt;/p&gt;

&lt;p&gt;Numbers (double/int/long/decimal) and booleans are still treated as markers for inclusion/exclusion.&lt;/p&gt;

&lt;p&gt;2) Field ordering of find() projections using $elemMatch may not be the same between 4.2 and 4.4. See here in design doc:&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1K3KuAeYg5KuD1dKw4UvPLBite43_qv4wAd79rMwiJEQ/edit#bookmark=id.4iidgo563q21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1K3KuAeYg5KuD1dKw4UvPLBite43_qv4wAd79rMwiJEQ/edit#bookmark=id.4iidgo563q21&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;3) $slice (in find()) no longer includes the entire root of a projected subfield&lt;br/&gt;
e.g. in 4.2, this query would include all of &apos;a&apos;:&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;code&amp;#93;&lt;/span&gt;&lt;br/&gt;
db.c.find({}, {x: 1, &quot;a.c&quot;: {$slice: 1}})&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;code&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;In 4.4, only &apos;a.c&apos; will be included. This was arguably a bug.&lt;/p&gt;

&lt;p&gt;4) Applying the positional projection to a path which had no arrays now behaves like an inclusion projection, rather than creating an empty document. See here in design document (and links to more detailed explanations):&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1K3KuAeYg5KuD1dKw4UvPLBite43_qv4wAd79rMwiJEQ/edit#bookmark=kix.kwu7hv9rfjc6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1K3KuAeYg5KuD1dKw4UvPLBite43_qv4wAd79rMwiJEQ/edit#bookmark=kix.kwu7hv9rfjc6&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This will only affect queries that use positional projection ($) on non-array fields.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Plug in the new execution code to the find() command. This should remove most uses of ProjectionExec from the query system.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1073701">DOCS-13321</key>
            <summary>Investigate changes in SERVER-42423: Use ProjectionExecutor in ProjectionStageDefault</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-query</label>
                    </labels>
                <created>Thu, 2 Jan 2020 18:52:17 +0000</created>
                <updated>Mon, 13 Nov 2023 18:12:11 +0000</updated>
                            <resolved>Tue, 16 Jun 2020 22:20:39 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due>Fri, 5 Jun 2020 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3211415" author="xgen-internal-githook" created="Tue, 16 Jun 2020 22:22:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13321&quot; title=&quot;Investigate changes in SERVER-42423: Use ProjectionExecutor in ProjectionStageDefault&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13321&quot;&gt;&lt;del&gt;DOCS-13321&lt;/del&gt;&lt;/a&gt;: 4.4 project compatibility changes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a11bca38df2c03bd2714f1304f3e54527f3156a0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a11bca38df2c03bd2714f1304f3e54527f3156a0&lt;/a&gt;&lt;/p&gt;</comment>
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