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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-75672] Classic engine incorrectly use 34 digits precision when converting from double to decimal</title>
                <link>https://jira.mongodb.org/browse/SERVER-75672</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Classic engine use &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/pipeline/expression.cpp#L361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;34 digits precision&lt;/a&gt; when converting from double to decimal for left hand side of $add (double + decimal), while for other cases like &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/pipeline/expression.cpp#L390&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;right hand side of $add&lt;/a&gt; or $multiply 15 digits precision is used.&lt;/p&gt;

&lt;p&gt;In SBE, 15 digits precision is used in all cases.&lt;/p&gt;

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

&lt;p&gt;Per &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;, 15 digits precision is the correct one we should use&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;The conversion from double to Decimal uses 15 digits by default based on research done with product management, solution architects and customers. When users add 0.02 to a Decimal amount 0.98, they expect to get an exact 1.00, not some 0.999999999999... something, even if the update was specified using a double precision number, or the other way around.&#160;Fifteen decimal digits is the largest number that can round trip through double precision without loosing precision.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="2306876">SERVER-75672</key>
            <summary>Classic engine incorrectly use 34 digits precision when converting from double to decimal</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="zixuan.zhuang@mongodb.com">Zixuan Zhuang</reporter>
                        <labels>
                            <label>7.1-Type-Precision-Fixes</label>
                    </labels>
                <created>Tue, 4 Apr 2023 21:55:09 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:37 +0000</updated>
                            <resolved>Thu, 6 Apr 2023 13:23:36 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5328483" author="xgen-internal-githook" created="Wed, 5 Apr 2023 23:46:02 +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-75672&quot; title=&quot;Classic engine incorrectly use 34 digits precision when converting from double to decimal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75672&quot;&gt;&lt;del&gt;SERVER-75672&lt;/del&gt;&lt;/a&gt; round to 15 digits when converting double to decimal for $add&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4858d4fdec15b9856d2dc06141022bd4c846560b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4858d4fdec15b9856d2dc06141022bd4c846560b&lt;/a&gt;&lt;/p&gt;</comment>
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