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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-79851] [CQF] Store collation-op along with the shard key in optimizer metadata</title>
                <link>https://jira.mongodb.org/browse/SERVER-79851</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we represent the shard key using the &lt;a href=&quot;https://github.com/10gen/mongo/blob/cda603597b909ed11ad7d47976f98630f9784211/src/mongo/db/query/optimizer/metadata.h#L52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DistributionAndPaths struct&lt;/a&gt;. This struct is really about modeling the distribution/management of data between threads; it only stores the shard key as a vector of ABT paths, which is insufficient to model hashed shard keys.&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to add the ability to represent hashed shard keys in the metadata and refactor the existing rewrites to reference this new representation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2412296">SERVER-79851</key>
            <summary>[CQF] Store collation-op along with the shard key in optimizer metadata</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="ben.shteinfeld@mongodb.com">Ben Shteinfeld</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Aug 2023 18:18:50 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:47 +0000</updated>
                            <resolved>Wed, 16 Aug 2023 11:54:16 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5635976" author="xgen-internal-githook" created="Tue, 15 Aug 2023 19:56:45 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ben Shteinfeld&apos;, &apos;email&apos;: &apos;ben.shteinfeld@mongodb.com&apos;, &apos;username&apos;: &apos;bshteinfeld&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79851&quot; title=&quot;[CQF] Store collation-op along with the shard key in optimizer metadata&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79851&quot;&gt;&lt;del&gt;SERVER-79851&lt;/del&gt;&lt;/a&gt; Change shard key representation in optimizer metadata to be collation-op aware&lt;/p&gt;

&lt;p&gt;This patch changes the optimizer&apos;s representation of the shard key from&lt;br/&gt;
an ABTVector to an IndexCollationSpec which stores a CollationOp&lt;br/&gt;
along-side each path. This will allow us to represent hashed shard keys.&lt;/p&gt;

&lt;p&gt;This patch also moves the shard key from DistributionAndPaths to&lt;br/&gt;
ShardingMetadata to decouple the two.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3733fe4f24d8a0ad553a2a8ed6238db3dd7d1aa3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3733fe4f24d8a0ad553a2a8ed6238db3dd7d1aa3&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="2418237">SERVER-80102</issuekey>
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