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            <title>[SERVER-42616] $stdDev accumulator can return imprecise results when spilling to disk</title>
                <link>https://jira.mongodb.org/browse/SERVER-42616</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When merging intermediate results which have spilled to disk, the $stdDev accumulator executes the variance calculation involving &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebfc0dc2e6f80e61d6b94742a79d1194997a7959/src/mongo/db/pipeline/accumulator_std_dev.cpp#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;some arithmetic over the previously calculated mean and &lt;/a&gt;. If the mean is a precise double, then this could result in precision loss.&lt;/p&gt;</description>
                <environment></environment>
        <key id="883162">SERVER-42616</key>
            <summary>$stdDev accumulator can return imprecise results when spilling to disk</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="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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>afz</label>
                            <label>query-44-grooming</label>
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                <created>Fri, 2 Aug 2019 17:33:24 +0000</created>
                <updated>Tue, 6 Dec 2022 02:51:39 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
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