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    <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>[DOCS-15541] Investigate changes in SERVER-67282: $add expression should not use DoubleDoubleSummation in SBE</title>
                <link>https://jira.mongodb.org/browse/DOCS-15541</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    Two behavior in sbe won&apos;t match classic engine (classic engine pending &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68544&quot; title=&quot;Make overflow decimal throws exception in classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68544&quot;&gt;&lt;del&gt;SERVER-68544&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68543&quot; title=&quot;Make $add operator type left associate for date in classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68543&quot;&gt;&lt;del&gt;SERVER-68543&lt;/del&gt;&lt;/a&gt;):&lt;br/&gt;
Date + overflowDecimal/nanDecimal behavior change: nanDate -&amp;gt; overflow exception&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;1.5, date, 1.5&amp;#93;&lt;/span&gt; result change: date + 3 -&amp;gt; date + 4 due to rounding&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/1J4lkN3eRJSB6mM01NtZ9QQam7ilA_d5CAdb_YBgeGkU/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1J4lkN3eRJSB6mM01NtZ9QQam7ilA_d5CAdb_YBgeGkU/edit?usp=sharing&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Right now, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/732ed1824f45c40f466888b55a2915ad1ad532dc/src/mongo/db/query/sbe_stage_builder_expression.cpp#L885&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SBE stage builder&lt;/a&gt; will transform a $add expression in the query language to a DoubleDoubleSum operation. Using DoubleDoubleSum for $add leads to confusing semantics, as explained in the description for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65735&quot; title=&quot;$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;:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Discussed with Geert Bosch 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 $sum 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 $add 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. &lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;To remain in sync with the classic engine, the stage builder should instead construct a tree of &lt;tt&gt;sbe::EPrimBinary::add&lt;/tt&gt; operations from the variadic operand list.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2112900">DOCS-15541</key>
            <summary>Investigate changes in SERVER-67282: $add expression should not use DoubleDoubleSummation in SBE</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Sat, 13 Aug 2022 00:04:17 +0000</created>
                <updated>Mon, 13 Nov 2023 17:39:18 +0000</updated>
                            <resolved>Thu, 8 Dec 2022 17:18:48 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4748270" author="edu.bot" created="Sat, 13 Aug 2022 00:04:22 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67282&quot; title=&quot;$add expression should not use DoubleDoubleSummation in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67282&quot;&gt;&lt;del&gt;SERVER-67282&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
6.1.0-rc0&lt;/p&gt;</comment>
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                            <customfieldvalue>Two behavior in sbe won&amp;#39;t match classic engine (classic engine pending &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68544&quot; title=&quot;Make overflow decimal throws exception in classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68544&quot;&gt;&lt;strike&gt;SERVER-68544&lt;/strike&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68543&quot; title=&quot;Make $add operator type left associate for date in classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68543&quot;&gt;&lt;strike&gt;SERVER-68543&lt;/strike&gt;&lt;/a&gt;):&lt;br/&gt;
Date + overflowDecimal/nanDecimal behavior change: nanDate -&amp;gt; overflow exception&lt;br/&gt;
[1.5, date, 1.5] result change: date + 3 -&amp;gt; date + 4 due to rounding&lt;br/&gt;
&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1J4lkN3eRJSB6mM01NtZ9QQam7ilA_d5CAdb_YBgeGkU/edit?usp=sharing&quot;&gt;https://docs.google.com/document/d/1J4lkN3eRJSB6mM01NtZ9QQam7ilA_d5CAdb_YBgeGkU/edit?usp=sharing&lt;/a&gt;&lt;br/&gt;
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