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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>[SERVER-69865] Primitive arithmetic operations in SBE promote int64 to decimal128 instead of double</title>
                <link>https://jira.mongodb.org/browse/SERVER-69865</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently if result of primitive arithmetic operation in SBE doesn&apos;t fit into int64, it will be promoted to decimal128: &lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/exec/sbe/values/arith_common.cpp#L144&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/exec/sbe/values/arith_common.cpp#L144&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;This contradicts documentation in some cases: &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/operator/aggregation/subtract/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/operator/aggregation/subtract/#behavior&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We don&apos;t want to expose decimal to users unless asked explicitly because it is not supported widely.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2142533">SERVER-69865</key>
            <summary>Primitive arithmetic operations in SBE promote int64 to decimal128 instead of double</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="13200">Declined</resolution>
                                        <assignee username="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Sep 2022 16:06:14 +0000</created>
                <updated>Thu, 24 Aug 2023 23:37:28 +0000</updated>
                            <resolved>Wed, 21 Sep 2022 16:13:39 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4845628" author="JIRAUSER1270969" created="Wed, 21 Sep 2022 16:13:40 +0000"  >&lt;p&gt;Currently it is not decided if it is a bug or a feature.&lt;br/&gt;
See WRITING-10039&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;1. Run mongod with --setParameter featureFlagSbeFull=true&lt;br/&gt;
2. Connect and insert document {&quot;lhs&quot;: NumberLong(&quot;9000000000000000000&quot;)}.&lt;br/&gt;
3. db.test.aggregate([{$project: {sum: {$add: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;$lhs&amp;quot;, NumberLong(&amp;quot;-9000000000000000000&amp;quot;)&amp;#93;&lt;/span&gt;}}}, {$addFields: {st: {$type: &quot;$sum&quot;}}}])&lt;br/&gt;
Found:&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;632b0eeab16205c4487fd24e&quot;), &quot;sum&quot; : NumberDecimal(&quot;-18000000000000000000&quot;), &quot;st&quot; : &quot;decimal&quot; }
&lt;p&gt;Expected:&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;632b0eeab16205c4487fd24e&quot;), &quot;sum&quot; : -18000000000000000000, &quot;st&quot; : &quot;double&quot; }</customfieldvalue>

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