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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>[SERVER-32873] Incorrect handling of NumberLong in $pow function</title>
                <link>https://jira.mongodb.org/browse/SERVER-32873</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;$pow&lt;/tt&gt; has issues where a NumberLong base of -1 is used with a NumberLong exponent of a negative odd value.&lt;/p&gt;

&lt;p&gt;For example:&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;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;MongoDB Enterprise &amp;gt; db.v.aggregate({$project: {&apos;a&apos;: { $pow: [ NumberLong(-1), NumberLong(-5) ]  },  &apos;b&apos; : { $pow: [ -1, NumberLong(-3) ]  }   }  })&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;{ &quot;_id&quot; : ObjectId(&quot;5a689c791de68d211f6234d6&quot;), &quot;a&quot; : NumberLong(1), &quot;b&quot; : -1 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Removing the NumberLong from either argument causes the right answer.  It seems to be related purely to the return type being NumberLong, though I can confirm there are no issues with positive odd exponents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="486774">SERVER-32873</key>
            <summary>Incorrect handling of NumberLong in $pow function</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="patrick.meredith@mongodb.com">Patrick Meredith</reporter>
                        <labels>
                            <label>bkp</label>
                            <label>neweng</label>
                            <label>pull-request</label>
                    </labels>
                <created>Wed, 24 Jan 2018 14:59:53 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:03 +0000</updated>
                            <resolved>Sat, 10 Feb 2018 22:23:11 +0000</resolved>
                                                    <fixVersion>3.7.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1801994" author="xgen-internal-githook" created="Sat, 10 Feb 2018 17:05:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;KevinCybura@gmail.com&apos;, &apos;name&apos;: &apos;KevinCybura&apos;, &apos;username&apos;: &apos;KevinCybura&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32873&quot; title=&quot;Incorrect handling of NumberLong in $pow function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32873&quot;&gt;&lt;del&gt;SERVER-32873&lt;/del&gt;&lt;/a&gt; Fix incorrect handling of NumberLong in $pow function&lt;/p&gt;

&lt;p&gt;Signed-off-by: Charlie Swanson &amp;lt;charlie.swanson@mongodb.com&amp;gt;&lt;/p&gt;

&lt;p&gt;Closes #1211&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e6e8dcf826c8e25b53c8368a0d538dfbdeaee589&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e6e8dcf826c8e25b53c8368a0d538dfbdeaee589&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1798337" author="charlie.swanson" created="Wed, 7 Feb 2018 17:32:23 +0000"  >&lt;p&gt;Assigning this to myself since I&apos;m working with Kevin Cybura (a CUNY student, external contributor) to come up with a fix and pull request.&lt;/p&gt;</comment>
                            <comment id="1790793" author="charlie.swanson" created="Wed, 31 Jan 2018 17:24:25 +0000"  >&lt;p&gt;Looks like this is a straight-up bug in the implementation. Once we determine that the result of the expression can be represented as a long (which is correct in this case), &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3c34eda8d8a38b982a1659b919e9f4b5971ba512/src/mongo/db/pipeline/expression.cpp#L3136-L3156&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we assume that both numbers are positive&lt;/a&gt;. It seems like there should be a special case for when the exponent is negative. When the exponent is negative, the only way we could have the result be a long is when the base is 0, 1, or -1, in which case computing the answer is relatively straightforward.&lt;/p&gt;</comment>
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