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    <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-71806] Review/fix usages of `ChunkRange::extractKeyPattern` and `Helpers::inferKeyPattern`</title>
                <link>https://jira.mongodb.org/browse/SERVER-71806</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Both &lt;a href=&quot;https://github.com/mongodb/mongo/blob/19edc0f6f0e1a7d467ca0a9ce1b668663f93ec7d/src/mongo/s/catalog/type_chunk.cpp#L135-L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extractKeyPattern&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/39640e543c6315bcc090531befff09a751d32ed5/src/mongo/db/dbhelpers.cpp#L347-L353&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;inferKeyPattern&lt;/a&gt; wrongly assume that no field in a shard key can be hashed.&lt;/p&gt;

&lt;p&gt;Given a document, they simply generate a key pattern by setting at 1 all the values of the fields.&lt;/p&gt;

&lt;p&gt;Examples:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Real shard key pattern&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Document &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Inferred/extracted key pattern &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x:1, y:1} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x: 12345, y: 67890} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x:1, y:1} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Correct &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x:hashed, y:1} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x: 12345, y: 67890} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; {x:1, y:1} &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; Wrong &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/error.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;
</description>
                <environment></environment>
        <key id="2200873">SERVER-71806</key>
            <summary>Review/fix usages of `ChunkRange::extractKeyPattern` and `Helpers::inferKeyPattern`</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Fri, 2 Dec 2022 18:29:19 +0000</created>
                <updated>Thu, 26 Oct 2023 10:02:58 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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