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    <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-83568] Extend assertAggFuzzerResultDivergenceIsAcceptable() to cover any pipeline that has $group stage and spilling is not disabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-83568</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$group doesn&apos;t guarantee the order in which records inside the group are being aggregated, this can cause divergencies in resulting values if involved types are not&#160; associative over given aggregation function (e.g. when summing up floating point numbers)&lt;/p&gt;

&lt;p&gt;Generally we should not expect even the same $group query over the same data set to generate the same result.&#160;&lt;/p&gt;

&lt;p&gt;Release and debug variants of group stage use different spilling strategy that causes some multiversion tests to generate results with slightly different roundoff errors.&#160;&lt;/p&gt;

&lt;p&gt;There is a function in src/fuzzers/agg/agg_compare_results.js called assertAggFuzzerResultDivergenceIsAcceptable() that covers exactly this scenario. It should be extended to cover the case when $group stage is allowed to spill to disk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2508764">SERVER-83568</key>
            <summary>Extend assertAggFuzzerResultDivergenceIsAcceptable() to cover any pipeline that has $group stage and spilling is not disabled</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="serhii.lysenko@mongodb.com">Serhii Lysenko</assignee>
                                    <reporter username="serhii.lysenko@mongodb.com">Serhii Lysenko</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Nov 2023 16:59:17 +0000</created>
                <updated>Tue, 19 Dec 2023 21:06:05 +0000</updated>
                            <resolved>Tue, 19 Dec 2023 21:06:05 +0000</resolved>
                                    <version>7.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="5961302" author="JIRAUSER1273041" created="Tue, 19 Dec 2023 21:06:05 +0000"  >&lt;p&gt;Another solution proposed: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84315&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-84315&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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