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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-26050] Unique key violation for index with a non-simple collation has unclear error message</title>
                <link>https://jira.mongodb.org/browse/SERVER-26050</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;
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				&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.numbers.ensureIndex({text: 1}, {unique: true, collation: {locale: &quot;en&quot;, numericOrdering: true}})&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.numbers.insert({text: &quot;10&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.numbers.insert({text: &quot;10&quot;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Gives an output of:&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;WriteResult({&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;	&quot;nInserted&quot; : 0,&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;	&quot;writeError&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;		&quot;code&quot; : 11000,&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;		&quot;errmsg&quot; : &quot;E11000 duplicate key error index: test.numbers.$text_1 dup key: { : \&quot;\u000f\f\u0001\u0005\u0001\u0005\&quot; }&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;	}&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;})&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;Whereas values not transformed by ICU provide a readable key:&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;WriteResult({&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;	&quot;nInserted&quot; : 0,&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;	&quot;writeError&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;		&quot;code&quot; : 11000,&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;		&quot;errmsg&quot; : &quot;E11000 duplicate key error index: test.strings.$text_1 dup key: { : \&quot;10\&quot; }&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;	}&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;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="315338">SERVER-26050</key>
            <summary>Unique key violation for index with a non-simple collation has unclear error message</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>collation</label>
                            <label>query-44-grooming</label>
                            <label>storch</label>
                    </labels>
                <created>Fri, 9 Sep 2016 21:18:50 +0000</created>
                <updated>Tue, 30 Jan 2024 15:22:20 +0000</updated>
                                            <version>3.3.12</version>
                                                    <component>Querying</component>
                    <component>Usability</component>
                                        <votes>3</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="5356716" author="kyle.suarez" created="Tue, 18 Apr 2023 18:48:10 +0000"  >&lt;p&gt;Sending to the backlog but adding it to the quick wins bucket.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;david.storch@mongodb.com&quot;&gt;david.storch@mongodb.com&lt;/a&gt; thinks this might not be &lt;em&gt;that&lt;/em&gt; quick. One interesting note is that we do want to eventually upgrade the ICU library and that will necessitate an index format change (as well as affecting how we approach this issue, as Ivan has mentioned earlier.)&lt;/p&gt;</comment>
                            <comment id="5343590" author="JIRAUSER1270969" created="Thu, 13 Apr 2023 08:27:49 +0000"  >&lt;p&gt;After cosmetic usability fix and some more investigation, I found two ways to address this issue:&lt;/p&gt;

&lt;p&gt;1. Reverse-engineer icu::CollationKeys::writeSortKeyUpToQuaternary function to be able to extract collation elements from collation key and do a reverse-lookup to find corresponding UTF code points to build a string.&lt;/p&gt;

&lt;p&gt;Pros:&lt;/p&gt;

&lt;p&gt;Gives the best output.&lt;/p&gt;

&lt;p&gt;Cons:&lt;/p&gt;

&lt;p&gt;Tied to exact version of ICU library (but we already tied to it, because we store collation keys on disk).&lt;/p&gt;

&lt;p&gt;There are edge cases. For example, numerical ordering might contain just numbers.&lt;/p&gt;

&lt;p&gt;2. Check for DuplicateKey error status after index write operations in mongo::IndexAccessMethod::insert/update and extend error message with a conflicting document or human-readable key.&lt;/p&gt;

&lt;p&gt;Pros:&lt;/p&gt;

&lt;p&gt;Easier to implement.&lt;/p&gt;

&lt;p&gt;Less dependency on third party code.&lt;/p&gt;

&lt;p&gt;Cons:&lt;/p&gt;

&lt;p&gt;If we put whole document into error message (which we do in some cases, for example: batch insert), error messages will be less usable and it is possible that conflicting key would be hidden due to compaction.&lt;/p&gt;

&lt;p&gt;If we decided to try to extract human-readable index key from a document, we will need to implement extra logic that might be complex, to pass &#8220;human-readable&#8221; flag to underlying key generators and call them again.&lt;/p&gt;</comment>
                            <comment id="5314905" author="xgen-internal-githook" created="Fri, 31 Mar 2023 10:58:50 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26050&quot; title=&quot;Unique key violation for index with a non-simple collation has unclear error message&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26050&quot;&gt;SERVER-26050&lt;/a&gt; Add CollationKey(..) to hex-encoded index keys when using collation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6ee4d650e456ea73526729ec3e3cca3b7a5a1b14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6ee4d650e456ea73526729ec3e3cca3b7a5a1b14&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5311773" author="JIRAUSER1270969" created="Thu, 30 Mar 2023 13:05:46 +0000"  >&lt;p&gt;While we think about more complicated fix, I suggest adding &quot;CollationKey()&quot; around hex-encoded binary data to make output a little bit more clear.&lt;br/&gt;
Like we do for index bounds in explain output:&#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;
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					&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;&#160; &#160; &#160; &#160; &#160; &#160; indexBounds: {&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;&#160; &#160; &#160; &#160; &#160; &#160; &#160; text: [ &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;[CollationKey(0x292b292d292b29010b010b), {})&apos;&lt;/span&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; ]&lt;/span&gt;&lt;/pre&gt;
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					&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;&#160; &#160; &#160; &#160; &#160; &#160; }&lt;/span&gt;&lt;/pre&gt;
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					&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;&#160; &#160; &#160; &#160; &#160; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="5311559" author="JIRAUSER1270969" created="Thu, 30 Mar 2023 11:27:38 +0000"  >&lt;p&gt;Interesting side effect of this is that indexes with collation can&apos;t cover projections&lt;/p&gt;</comment>
                            <comment id="5308775" author="JIRAUSER1270969" created="Wed, 29 Mar 2023 12:40:21 +0000"  >&lt;p&gt;Under the hood indexes with collation, use icu::Collator::getCollationKey to get a sequence of bytes that can be compared just using regular comparison that should produce the same result as comparing original strings with the same collator. And we store this sequence in the index, instead of the original string.&lt;/p&gt;

&lt;p&gt;The ICU docs state that reverse operation is not supported.&lt;/p&gt;

&lt;p&gt;The other approach would be to catch the error and print the document or the update that caused the error to appear as well. Or something similar.&#160;&lt;/p&gt;</comment>
                            <comment id="5308632" author="JIRAUSER1270969" created="Wed, 29 Mar 2023 11:16:17 +0000"  >&lt;p&gt;The reason for this output is stated in this comment: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/index_entry_comparison.cpp#L212&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/storage/index_entry_comparison.cpp#L212&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I am investigating how we can extract some human-readable user strings.&lt;/p&gt;</comment>
                            <comment id="3723705" author="JIRAUSER1259502" created="Sat, 17 Apr 2021 07:50:54 +0000"  >&lt;p&gt;I found this issue and see that information is now hex encoded. However I struggle to successfully decode the information. Any pointers would be great.&#160;&lt;/p&gt;

&lt;p&gt;Here my StackOverflow question:&lt;br/&gt;
&lt;a href=&quot;https://stackoverflow.com/q/67131426/8051909&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/q/67131426/8051909&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3042793" author="david.storch" created="Thu, 16 Apr 2020 16:00:09 +0000"  >&lt;p&gt;Under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46810&quot; title=&quot;Broken E11000 duplicate key error when unique index contains collation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46810&quot;&gt;&lt;del&gt;SERVER-46810&lt;/del&gt;&lt;/a&gt;, we fixed the problem where collation can cause the duplicate key error message to contain invalid UTF-8. However, the error messages still provide collation keys rather than the raw user string that resulted in the duplicate key. This ticket now tracks an improvement which would expose the raw string whose collation key resulted in a duplicate key error. This is not trivial to implement, since duplicate key errors are produced by the storage layer, which has no knowledge of the collation implementation or of the raw string that resulted in the duplicated collation key.&lt;/p&gt;</comment>
                            <comment id="2402010" author="etay2000" created="Fri, 30 Aug 2019 16:06:17 +0000"  >&lt;p&gt;Since this currently makes the error message unreadable (and unusable), is there a way to manually transform the duplicate key values back into a readable format?&lt;/p&gt;</comment>
                            <comment id="1923316" author="bruce.lucas@10gen.com" created="Mon, 18 Jun 2018 14:02:16 +0000"  >&lt;p&gt;I adjusted the priority and issue type because this can result in non-UTF-8 characters in that can cause decoding the result in the client to fail.&lt;/p&gt;</comment>
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