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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-68543] Make $add operator type left associate for date in classic engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-68543</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently $add always use widest numerical type to do summation, then cast to date type if there&apos;s a date element in the array.&lt;/p&gt;

&lt;p&gt;This is fine for all numeric types except date which could cause confusion:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;1.5 + date + 1.5&amp;#93;&lt;/span&gt; can be either date + 3 or date + 4, the later one comes from round(round(date + 1.5) + 1.5).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We should make the $add type left associate for date type, so when we are date to any number the result is casted to date, and following (right side) numbers are all added and casted to date type. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/301f931aff01aad1352b6dd725bfbcae807450ef/src/mongo/db/pipeline/expression.cpp#L333-L394&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;code link&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;(We will not backport this change to 6.0 or earlier)&lt;/p&gt;

&lt;p&gt;(this ticket is for classic engine, sbe change will be included in &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;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2105925">SERVER-68543</key>
            <summary>Make $add operator type left associate for date in 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="zixuan.zhuang@mongodb.com">Zixuan Zhuang</assignee>
                                    <reporter username="zixuan.zhuang@mongodb.com">Zixuan Zhuang</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Aug 2022 17:47:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:58 +0000</updated>
                            <resolved>Wed, 17 Aug 2022 20:52:36 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4758745" author="xgen-internal-githook" created="Wed, 17 Aug 2022 20:44:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;zixuan.zhuang&apos;, &apos;email&apos;: &apos;zixuan.zhuang@mongodb.com&apos;, &apos;username&apos;: &apos;leozzx&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68543&quot; title=&quot;Make $add operator type left associate for date in classic engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68543&quot;&gt;&lt;del&gt;SERVER-68543&lt;/del&gt;&lt;/a&gt; Make  operator type left associate for date&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f8f59cd20901e9de9edb5eb5f33ea72f1fc1ef7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f8f59cd20901e9de9edb5eb5f33ea72f1fc1ef7&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2116432">DOCS-15545</issuekey>
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            <issuekey id="2068580">SERVER-67282</issuekey>
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                            <customfieldvalue>Changes in classic query engine, SBE change is done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67282&quot; title=&quot;$add expression should not use DoubleDoubleSummation in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67282&quot;&gt;&lt;strike&gt;SERVER-67282&lt;/strike&gt;&lt;/a&gt;&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;
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