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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-20284] Allow $cond to accept longer arrays</title>
                <link>https://jira.mongodb.org/browse/SERVER-20284</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Why not allow the array form of $cond to accept longer arrays of if-then-elseif-then conditions?  Instead of restricting it to only accepting arrays of length 3, it could accept any array of length 2*n + 1, with obvious interpretation: &lt;/p&gt;
{ &quot;$cond&quot;: [ if, then, elseif, then, elseif, then, ..., else ] }
&lt;p&gt;.  This is clearer and simpler than having to nest multiple $cond terms.&lt;/p&gt;</description>
                <environment></environment>
        <key id="228366">SERVER-20284</key>
            <summary>Allow $cond to accept longer arrays</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="kperry">Kevin Perry</reporter>
                        <labels>
                            <label>expression</label>
                    </labels>
                <created>Thu, 3 Sep 2015 20:26:19 +0000</created>
                <updated>Tue, 6 Dec 2022 04:44:57 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1626594" author="asya" created="Wed, 19 Jul 2017 17:52:33 +0000"  >&lt;p&gt;I think this is more a request for terser version of switch when the same value is being compared to different possible values.&lt;/p&gt;

&lt;p&gt;For the record, DECODE is something like 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;DECODE (warehouse_id, 1, &apos;Southlake&apos;, &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;                      2, &apos;San Francisco&apos;, &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;                      3, &apos;New Jersey&apos;, &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;                      4, &apos;Seattle&apos;,&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;                      &apos;Non domestic&apos;)  --default value&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;This is like a C switch statement, rather than $switch/$case we implemented already which evaluates completely independent case statements.&lt;/p&gt;</comment>
                            <comment id="1470500" author="perry@princeton.edu" created="Thu, 5 Jan 2017 20:58:07 +0000"  >&lt;p&gt;Yes, it&apos;s true the &quot;meaning&quot; of the &quot;3rd element&quot; is different for a 3-element array than for a longer array, because there is always the trailing &quot;else&quot; element.  But if you know you&apos;re writing an if-then-else, there&apos;s really only one reasonable decoding of what an array of any particular length means: the 2*n + 1 terms are used as n &quot;if-else&quot; pairs, plus a trailing &quot;else&quot; expression.  This, along with the fact that the array length must be odd, can be made clear in the doc.  The behavior would actually be somewhat similar to that of Oracle&apos;s DECODE() function, which has been in use for decades (&lt;a href=&quot;https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm&lt;/a&gt;).&lt;/p&gt;</comment>
                            <comment id="1470412" author="asya" created="Thu, 5 Jan 2017 19:18:28 +0000"  >&lt;p&gt;I think if we leave it open we would have to make it clear what the desired syntax for $cond could be.&lt;/p&gt;

&lt;p&gt;Currently $cond accepts one of the following syntax:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$cond: [ &amp;lt;if-expression&amp;gt;, &amp;lt;then-expression&amp;gt;, &amp;lt;else-expressions&amp;gt; ] }&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;or&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;   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;{$cond:  { if: &amp;lt;if-expression&amp;gt;, then: &amp;lt;then-expression&amp;gt;, else: &amp;lt;else-expressions&amp;gt; } }&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;Adding to array would raise an ambiguity of what each subsequent array element means (if there&apos;s a 4th element, what is it? In your example is would be last else but third element would be different than in the 3-element array case vs 4-array case which is confusing to read).&lt;/p&gt;

&lt;p&gt;Using named keys is problematic because you cannot have the same keyname twice (so you can&apos;t have multiple &apos;else-if&apos; etc).&lt;/p&gt;
</comment>
                            <comment id="1470144" author="perry@princeton.edu" created="Thu, 5 Jan 2017 15:43:28 +0000"  >&lt;p&gt;Well, sort of.  Using $switch is certainly cleaner than the alternative of using multiple embedded $conds.  But extending $cond as I&apos;ve suggested would give an even cleaner, more compact way of writing the same statements, if desired.   Most languages do implement both &quot;switch&quot; and &quot;elseif&quot; constructs.  Unless you have some particular reason not to, it still seems like this would be a nice feature to consider adding.&lt;/p&gt;</comment>
                            <comment id="1469402" author="asya" created="Wed, 4 Jan 2017 19:01:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10689&quot; title=&quot;Add a $switch expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10689&quot;&gt;&lt;del&gt;SERVER-10689&lt;/del&gt;&lt;/a&gt; resolves this ticket, yes?&lt;/p&gt;</comment>
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