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    <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-42854] $avg with Infinity can incorrectly return NaN</title>
                <link>https://jira.mongodb.org/browse/SERVER-42854</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When adding Infinity to any value using the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2abda565c6eb8db3e330bdc4ec210636d43459f3/src/mongo/util/summation.h#L49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DoubleDoubleSummation&lt;/a&gt; class, the &lt;tt&gt;_addend&lt;/tt&gt; double is calculated to be NaN. This is probably fine, however getting the result of the summation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2abda565c6eb8db3e330bdc4ec210636d43459f3/src/mongo/util/summation.h#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; results in a value of Infinity with an error of NaN. &lt;/p&gt;

&lt;p&gt;If this happens when the $avg accumulator spills to disk, we will attempt to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/accumulator_avg.cpp#L68-L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;process the NaN error &lt;/a&gt; as if its a finite value and as a result the accumulator evaluates to NaN.&lt;/p&gt;</description>
                <environment></environment>
        <key id="898561">SERVER-42854</key>
            <summary>$avg with Infinity can incorrectly return NaN</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Fri, 16 Aug 2019 17:24:20 +0000</created>
                <updated>Tue, 6 Dec 2022 02:50:27 +0000</updated>
                            <resolved>Tue, 19 Oct 2021 21:18:45 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4133666" author="david.percy" created="Tue, 19 Oct 2021 21:18:45 +0000"  >&lt;p&gt;Looks like the same bug as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37429&quot; title=&quot;$avg of Infinity and null is NaN on debug builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37429&quot;&gt;SERVER-37429&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2405477" author="geert.bosch" created="Tue, 3 Sep 2019 15:32:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt;, your fix looks correct to me. Indeed the idea behind the &lt;tt&gt;_special&lt;/tt&gt; member was to correctly handle all the non-finite corner cases by doing the same that a simple (non-double-double) summation would return if that more accurate mechanism results in special (non-finite) values in any way.&lt;/p&gt;</comment>
                            <comment id="2383384" author="charlie.swanson" created="Thu, 22 Aug 2019 20:53:40 +0000"  >&lt;p&gt;Putting this on the backlog because our understanding is that we will soon disable testing of debug vs. non-debug builds and this will stop being a problem in the build. &lt;/p&gt;

&lt;p&gt;It is still a bug though, so leaving it open.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="612935">SERVER-37429</issuekey>
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                            <customfieldvalue>&lt;p&gt;*&lt;b&gt;On a debug build, to ensure we always spill to disk&lt;/b&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;   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;db.test.insert({_id: 0, value: 5});&lt;/span&gt;&lt;/pre&gt;
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					&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;db.test.aggregate([{ $group: {&lt;/span&gt;&lt;/pre&gt;
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