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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-37731] Why $pow results in NaN when every other operation illegal math operation causes error?</title>
                <link>https://jira.mongodb.org/browse/SERVER-37731</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As given &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/pow/index.html#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;,&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&#160;$pow:&#160;[&#160;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;5&lt;/span&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;,&#160;&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0.5&lt;/span&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;&#160;]&#160;} &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="623503">SERVER-37731</key>
            <summary>Why $pow results in NaN when every other operation illegal math operation causes error?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="krish.raghuram">Raghuram Krishnaswami</reporter>
                        <labels>
                            <label>mql-semantics</label>
                    </labels>
                <created>Wed, 24 Oct 2018 15:12:56 +0000</created>
                <updated>Tue, 6 Dec 2022 03:15:00 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2044062" author="ramon.fernandez" created="Fri, 26 Oct 2018 23:29:34 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=krish.raghuram&quot; class=&quot;user-hover&quot; rel=&quot;krish.raghuram&quot;&gt;krish.raghuram&lt;/a&gt;. We&apos;ve sent this to the Query team for evaluation. If it gets folded into &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27190&quot; title=&quot;add $throw/$error as pipeline operator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27190&quot;&gt;SERVER-27190&lt;/a&gt; please watch that ticket for further updates.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="2040535" author="krish.raghuram" created="Wed, 24 Oct 2018 15:21:40 +0000"  >&lt;p&gt;Umm...&#160;I clicked &quot;create&quot; before completing the description. And Im not able to edit the issue description either...&lt;/p&gt;

&lt;p&gt;So I&apos;ll just leave the description here...&lt;/p&gt;

&lt;p&gt;--------------------------------------------------------------------------------------------------------------&lt;/p&gt;

&lt;p&gt;As given &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37731#behavior&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;here&lt;/a&gt;&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;{ $pow: [ -5, 0.5 ] } &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;results in a &lt;tt&gt;NaN&lt;/tt&gt; value.&lt;/p&gt;

&lt;p&gt;Every other illegal math operation, such as &lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;tt&gt;$log10&lt;/tt&gt; of negative number&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;$ln&lt;/tt&gt; of negative number&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;$log&lt;/tt&gt; of negative number OR negative base&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;$sqrt&lt;/tt&gt; of negative number&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;result in an error.&lt;/p&gt;

&lt;p&gt;Wouldn&apos;t it be more consistent to make the &lt;tt&gt;$pow&lt;/tt&gt; also an error?&lt;/p&gt;

&lt;p&gt;PS : The issue was already mentioned before, in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27190&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-27190&lt;/a&gt;. But it was brought up as a use-case, and was not the main point of focus.&lt;/p&gt;</comment>
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