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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>
    </build-info>


<item>
            <title>[SERVER-79514] Make value comparison consistent in MatchExpression</title>
                <link>https://jira.mongodb.org/browse/SERVER-79514</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;equivalent()&lt;/tt&gt; function should compare BSONElements consistently in comparison and $in operators.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2405412">SERVER-79514</key>
            <summary>Make value comparison consistent in MatchExpression</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Jul 2023 18:08:11 +0000</created>
                <updated>Tue, 28 Nov 2023 13:08:12 +0000</updated>
                            <resolved>Tue, 28 Nov 2023 12:58:42 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5908680" author="JIRAUSER1261429" created="Tue, 28 Nov 2023 12:58:42 +0000"  >&lt;p&gt;Minor backward incompatible change. &lt;br/&gt;
TLDR: partial indexes with the same index keys and the same partial expressions compared using their collation are not allowed any more.&lt;/p&gt;

&lt;p&gt;Partial filter expression used not to be validated using provided collation as a result, it was possible to create two equivalent indexes:&lt;/p&gt;

&lt;p&gt;&#160;&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.coll.createIndex({a: 1}, {name: &quot;index0&quot;,{ locale: &quot;en_US&quot;, strength: 1 }, partialFilterExpression: {b:&quot;case&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;   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;db.coll.createIndex({a: 1}, {name: &quot;index1&quot;, { locale: &quot;en_US&quot;, strength: 1 }, partialFilterExpression: {b: &quot;CASE&quot;}};&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;However, only the first index &lt;tt&gt;index0&lt;/tt&gt; will be used to answer queries like&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.coll.find({a: 1, b: &quot;case&quot;}).collation({ locale: &quot;en_US&quot;, strength: 1 });&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.coll.find({a: 1, b: &quot;CASE&quot;}).collation({ locale: &quot;en_US&quot;, strength: 1 });&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;db.coll.find({a: 1, b: &quot;Case&quot;}).collation({ locale: &quot;en_US&quot;, strength: 1 });&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&lt;tt&gt;index1&lt;/tt&gt; would be never used.&lt;/p&gt;

&lt;p&gt;After the change the second &lt;tt&gt;index1&lt;/tt&gt; will be prevented from creating with the following error:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;MongoServerError: Index already exists with a different name: index0&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Nothing changed for databases with existing duplicating partial indexes, the indexes will be kept and only the first created index will be used to serve the queries as it was before.&lt;/p&gt;</comment>
                            <comment id="5906843" author="xgen-internal-githook" created="Mon, 27 Nov 2023 19:08:53 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alexander Ignatyev&apos;, &apos;email&apos;: &apos;alexander.ignatyev@mongodb.com&apos;, &apos;username&apos;: &apos;aligusnet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79514&quot; title=&quot;Make value comparison consistent in MatchExpression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79514&quot;&gt;&lt;del&gt;SERVER-79514&lt;/del&gt;&lt;/a&gt; Make value comparison consistent in MatchExpression&lt;/p&gt;

&lt;p&gt;Use the collator to compare values of comparison match expressions.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1937ef27625420032c989369ad4abc5fb00e6d9a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1937ef27625420032c989369ad4abc5fb00e6d9a&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="2510572">DOCS-16516</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1322941">SERVER-47664</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                            <customfieldvalue>TLDR: partial indexes with the same index keys and the same partial expressions compared using their collation are not allowed any more.&lt;br/&gt;
&lt;br/&gt;
&lt;br/&gt;
Partial filter expression used not to be validated using provided collation as a result, it was possible to create two equivalent indexes:&lt;br/&gt;
&lt;br/&gt;
{{code}}&lt;br/&gt;
db.coll.createIndex({a: 1}, {name: &amp;quot;index0&amp;quot;, { locale: &amp;quot;en_US&amp;quot;, strength: 1 }, partialFilterExpression: {b: &amp;quot;case&amp;quot;}};&lt;br/&gt;
&lt;br/&gt;
db.coll.createIndex({a: 1}, {name: &amp;quot;index1&amp;quot;, { locale: &amp;quot;en_US&amp;quot;, strength: 1 }, partialFilterExpression: {b: &amp;quot;CASE&amp;quot;}};&lt;br/&gt;
{{code}}&lt;br/&gt;
&lt;br/&gt;
However, only the first index {{index0}} will be used to answer queries like&lt;br/&gt;
&lt;br/&gt;
{{code}}&lt;br/&gt;
db.coll.find({a: 1, b: &amp;quot;case&amp;quot;}).collation({ locale: &amp;quot;en_US&amp;quot;, strength: 1 }).explain();&lt;br/&gt;
db.coll.find({a: 1, b: &amp;quot;CASE&amp;quot;}).collation({ locale: &amp;quot;en_US&amp;quot;, strength: 1 }).explain();&lt;br/&gt;
db.coll.find({a: 1, b: &amp;quot;Case&amp;quot;}).collation({ locale: &amp;quot;en_US&amp;quot;, strength: 1 }).explain();&lt;br/&gt;
{{code}}&lt;br/&gt;
&lt;br/&gt;
{{index1}} would be never used.&lt;br/&gt;
&lt;br/&gt;
&lt;br/&gt;
After the change the second {{index1}} will be prevented from creating with the following error:&lt;br/&gt;
&lt;br/&gt;
{{MongoServerError: Index already exists with a different name: index0}}&lt;br/&gt;
&lt;br/&gt;
Nothing changed for databases with existing duplicating partial indexes, the indexes will be kept and only the first created index will be used to serve the queries as it was before.</customfieldvalue>

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