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    <title>MongoDB Jira</title>
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    <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-14835] DOCS-14835: Investigate changes in SERVER-59785: [SBE] Change $concatArrays to not short-circuit on null</title>
                <link>https://jira.mongodb.org/browse/DOCS-14835</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &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;    This change makes it so that SBE does not short circuit on null. That is, it evaluates all of its arguments before checking whether they are null or arrays.&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;    In SBE, for almost all aggregate operators, all of the operator&apos;s arguments are evaluated first before doing typechecking or anything else. This was an intentional design decision.&lt;/p&gt;

&lt;p&gt;From what I can tell, the only aggregate operators that intentionally have &quot;short-circuit&quot; style behavior are as follows:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;$and - Short-circuits evaluation of the remaining arguments when an argument evaluates to false (or something that when coerced to boolean will produce &quot;false&quot;)&lt;/li&gt;
	&lt;li&gt;$or -&#160;Short-circuits evaluation of the remaining arguments when an argument evaluates to true (or something that when coerced to boolean will produce &quot;true&quot;)&lt;/li&gt;
	&lt;li&gt;$switch - Short-circuits evaluation of the remaining case/then&apos;s when a case evaluates to true&#160;(or something that when coerced to boolean will produce &quot;true&quot;)&lt;/li&gt;
	&lt;li&gt;$ifNull - Short-circuits evaluation of the remaining arguments when an argument evaluates to a value that is not null/missing&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Aside from the operators listed above, unless there is a specific reason, each aggregate operator&apos;s arguments should be evaluated first before doing anything else.&lt;/p&gt;

&lt;p&gt;I noticed that the SBE implementation of $concatArrays seems to exhibit &quot;short-circuit on null&quot; behavior. Here is an example that demonstrates this:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;was&quot; : false, &quot;ok&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.c.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{_id: 1, a: null, b: &quot;foo&quot;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.c.aggregate([{$project: {x: {$concatArrays: [[1,2], &quot;$a&quot;, {$add: [1,&quot;$b&quot;]}]}}}])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{_id: 1, x: null}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The goal of this task is to determine if $concatArrays in SBE should evaluate all of its arguments first before doing typechecking or anything else, and if so, to update the SBE implementation of $concatArrays accordingly.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1887801">DOCS-14835</key>
            <summary>DOCS-14835: Investigate changes in SERVER-59785: [SBE] Change $concatArrays to not short-circuit on null</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="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="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>feature</label>
                    </labels>
                <created>Fri, 1 Oct 2021 13:20:48 +0000</created>
                <updated>Wed, 31 Jan 2024 20:16:28 +0000</updated>
                                                            <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4096365" author="dbeng-pm-bot" created="Fri, 1 Oct 2021 13:20:51 +0000"  >&lt;p&gt;&lt;em&gt;Downstream changes updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59785&quot; title=&quot;[SBE] Change $concatArrays to not short-circuit on null&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59785&quot;&gt;&lt;del&gt;SERVER-59785&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
This change makes it so that SBE does not short circuit on null. That is, it evaluates all of its arguments before checking whether they are null or arrays.&lt;/p&gt;</comment>
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