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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-32109] $rename does not update value if existing &quot;to&quot; field has the same numeric value but different type.</title>
                <link>https://jira.mongodb.org/browse/SERVER-32109</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On 3.6, a $rename operator applied to a destination field that already exists, and has the same value as the source field, will not update that field. On 3.4, the field type is changed as expected.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.test.insert({to:NumberLong(100), from:100});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.test.update({},{$rename:{from:&quot;to&quot;}});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.test.findOne()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// 3.6: { &quot;to&quot; : NumberLong(100) }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// 3.4: { &quot;to&quot; : 100 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="465008">SERVER-32109</key>
            <summary>$rename does not update value if existing &quot;to&quot; field has the same numeric value but different type.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                            <label>ufz</label>
                    </labels>
                <created>Wed, 29 Nov 2017 01:21:24 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:17 +0000</updated>
                            <resolved>Wed, 13 Dec 2017 17:17:27 +0000</resolved>
                                    <version>3.6.0-rc6</version>
                                    <fixVersion>3.6.1</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1751488" author="xgen-internal-githook" created="Wed, 13 Dec 2017 23:19:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32109&quot; title=&quot;$rename does not update value if existing &amp;quot;to&amp;quot; field has the same numeric value but different type.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32109&quot;&gt;&lt;del&gt;SERVER-32109&lt;/del&gt;&lt;/a&gt; RenameNode no longer checks for no-op set.&lt;/p&gt;

&lt;p&gt;Before this change, a {$rename: {from: &quot;to&quot;}} would check to see if&lt;br/&gt;
the &quot;from&quot; and &quot;to&quot; values were identical, allowing it to elide the&lt;br/&gt;
{$set: {to: &amp;lt;value-of-from-field&amp;gt;}} portion of the oplog update&lt;br/&gt;
entry. The equality check we used was not exact, however, resulting in&lt;br/&gt;
potentially incorrect results from $rename in edge cases.&lt;/p&gt;

&lt;p&gt;We could use a precise equality check, but it&apos;s more expensive. More&lt;br/&gt;
likely than not, it&apos;s cheaper to just include the $set in the oplog&lt;br/&gt;
update for every $rename, so that&apos;s what we do now.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4d53b4beb00eaa341bf2a134fbc9366d3333e830)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a81fbea1aaa09ad79b52c0fd5ad808f067e6acf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a81fbea1aaa09ad79b52c0fd5ad808f067e6acf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1751072" author="xgen-internal-githook" created="Wed, 13 Dec 2017 17:13:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32109&quot; title=&quot;$rename does not update value if existing &amp;quot;to&amp;quot; field has the same numeric value but different type.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32109&quot;&gt;&lt;del&gt;SERVER-32109&lt;/del&gt;&lt;/a&gt; RenameNode no longer checks for no-op set.&lt;/p&gt;

&lt;p&gt;Before this change, a {$rename: {from: &quot;to&quot;}} would check to see if&lt;br/&gt;
the &quot;from&quot; and &quot;to&quot; values were identical, allowing it to elide the&lt;br/&gt;
{$set: {to: &amp;lt;value-of-from-field&amp;gt;}} portion of the oplog update&lt;br/&gt;
entry. The equality check we used was not exact, however, resulting in&lt;br/&gt;
potentially incorrect results from $rename in edge cases.&lt;/p&gt;

&lt;p&gt;We could use a precise equality check, but it&apos;s more expensive. More&lt;br/&gt;
likely than not, it&apos;s cheaper to just include the $set in the oplog&lt;br/&gt;
update for every $rename, so that&apos;s what we do now.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d53b4beb00eaa341bf2a134fbc9366d3333e830&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d53b4beb00eaa341bf2a134fbc9366d3333e830&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1737645" author="david.storch" created="Wed, 29 Nov 2017 18:38:34 +0000"  >&lt;p&gt;Great find, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt;. Another gem from the generational fuzzer I presume?&lt;/p&gt;</comment>
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