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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-81135] Do not create a separate window for each init expression</title>
                <link>https://jira.mongodb.org/browse/SERVER-81135</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have implemented $avg as a combination of two accumulators, sum and count. We track the two accumulators separately and combine them at the end to compute the avg. The investigation showed that the maintenance of two separate accumulators is causing the regression. I believe the reason is that we treat each accumulator as a different window evaluating each document against the window boundaries twice.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2444515">SERVER-81135</key>
            <summary>Do not create a separate window for each init expression</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="13201">Fixed</resolution>
                                        <assignee username="foteini.alvanaki@mongodb.com">Foteini Alvanaki</assignee>
                                    <reporter username="foteini.alvanaki@mongodb.com">Foteini Alvanaki</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Sep 2023 09:56:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:17 +0000</updated>
                            <resolved>Mon, 25 Sep 2023 09:09:07 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5724522" author="xgen-internal-githook" created="Fri, 22 Sep 2023 15:50:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Foteini Alvanaki&apos;, &apos;email&apos;: &apos;foteini.alvanaki@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81135&quot; title=&quot;Do not create a separate window for each init expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81135&quot;&gt;&lt;del&gt;SERVER-81135&lt;/del&gt;&lt;/a&gt; Do not create a separate window for each init expression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90019c13bef324a48ca83153962dad0fd2b97870&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90019c13bef324a48ca83153962dad0fd2b97870&lt;/a&gt;&lt;/p&gt;</comment>
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