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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-65735] $add operator should not use DoubleDoubleSummation in the classic engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-65735</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Discussed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch@mongodb.com&quot;&gt;geert.bosch@mongodb.com&lt;/a&gt; who implemented DoubleDoubleSummation in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19735&quot; title=&quot;Add aggregation support for experimental decimal data type&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19735&quot;&gt;&lt;del&gt;SERVER-19735&lt;/del&gt;&lt;/a&gt; and we determined that DoubleDoubleSummation was implemented for use in $group aggregation operators like &lt;tt&gt;$sum&lt;/tt&gt; where the user does not have control over the ordering of input arguments and there are consistently a very large number of values that need to be summed.&lt;/p&gt;

&lt;p&gt;For the &lt;tt&gt;$add&lt;/tt&gt; expression, where arguments are passed in explicitly by the end user, we should be prioritizing the behavior which is most clear and obvious and add doubles together normally.&#160;&lt;/p&gt;

&lt;p&gt;This ticket fell out of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63099&quot; title=&quot;Constant folding should not assume arithmetic is associative or commutative in the general case&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63099&quot;&gt;&lt;del&gt;SERVER-63099&lt;/del&gt;&lt;/a&gt;, which is attempting to make $add behave the same with and without the constant folding optimization.&lt;/p&gt;

&lt;p&gt;More background around this decision can be found in &lt;a href=&quot;https://docs.google.com/document/d/1KVggjyQBX0wBJY2yAKQ0nuWUxWY-q7wv5IZTfDPg7hc/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this writeup&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2027223">SERVER-65735</key>
            <summary>$add operator should not use DoubleDoubleSummation in the classic engine</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="davis.haupt@mongodb.com">Davis Haupt</assignee>
                                    <reporter username="davis.haupt@mongodb.com">Davis Haupt</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Apr 2022 18:03:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:19 +0000</updated>
                            <resolved>Thu, 16 Jun 2022 17:58:43 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4619265" author="xgen-internal-githook" created="Wed, 15 Jun 2022 22:12:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Davis Haupt&apos;, &apos;email&apos;: &apos;davis.haupt@mongodb.com&apos;, &apos;username&apos;: &apos;davish&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65735&quot; title=&quot;$add operator should not use DoubleDoubleSummation in the classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65735&quot;&gt;&lt;del&gt;SERVER-65735&lt;/del&gt;&lt;/a&gt; $add operator should not use DoubleDoubleSummation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/62c5c0fdc0f896503ac861d014212772cdd6bc2b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/62c5c0fdc0f896503ac861d014212772cdd6bc2b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4536429" author="davis.haupt" created="Mon, 9 May 2022 19:40:38 +0000"  >&lt;p&gt;Property-based tests for left-to-right constant folding in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63099&quot; title=&quot;Constant folding should not assume arithmetic is associative or commutative in the general case&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63099&quot;&gt;&lt;del&gt;SERVER-63099&lt;/del&gt;&lt;/a&gt; are failing because of this bug.&lt;/p&gt;</comment>
                            <comment id="4512798" author="davis.haupt" created="Thu, 28 Apr 2022 13:21:25 +0000"  >&lt;p&gt;PR was approved, but moving to Waiting for Merge before clarifying whether this is safe to merge in without a scope / larger discussion.&lt;/p&gt;</comment>
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