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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-79853] [CQF] Generate SBE expression to hash shard key when invoking ShardFilterer</title>
                <link>https://jira.mongodb.org/browse/SERVER-79853</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the enforcer and implementers which handle RemoveOrphansRequirement, we currently generate physical plans that do not consider the collation spec of the shard key. This means for shard keys like {_id: &apos;hashed&apos;}, if we are performing a coll scan, we need to hash the value of _id before invoking the ShardFilterer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2412306">SERVER-79853</key>
            <summary>[CQF] Generate SBE expression to hash shard key when invoking ShardFilterer</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 18:26:39 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:47 +0000</updated>
                            <resolved>Tue, 22 Aug 2023 14:56:59 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5737373" author="JIRAUSER1269946" created="Thu, 28 Sep 2023 13:29:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sanika.phanse%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sanika.phanse@mongodb.com&quot;&gt;sanika.phanse@mongodb.com&lt;/a&gt; apologizes for the delay, I am just returning from OOO. This ticket should not be backported and is not related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78253&quot; title=&quot;Allow folks with hashed shard keys to drop the hashed index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78253&quot;&gt;&lt;del&gt;SERVER-78253&lt;/del&gt;&lt;/a&gt;, thank you!&lt;/p&gt;</comment>
                            <comment id="5734804" author="JIRAUSER1253438" created="Wed, 27 Sep 2023 15:32:26 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.shteinfeld%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;ben.shteinfeld@mongodb.com&quot;&gt;ben.shteinfeld@mongodb.com&lt;/a&gt; Any updates here? So far the feature has been backported to 7.0 and a backport to 6.0 is in-progress.&lt;/p&gt;</comment>
                            <comment id="5711845" author="JIRAUSER1253438" created="Mon, 18 Sep 2023 15:57:34 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.shteinfeld%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;ben.shteinfeld@mongodb.com&quot;&gt;ben.shteinfeld@mongodb.com&lt;/a&gt;, I am backporting &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78253&quot; title=&quot;Allow folks with hashed shard keys to drop the hashed index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78253&quot;&gt;&lt;del&gt;SERVER-78253&lt;/del&gt;&lt;/a&gt; as a part of PM-3493 (to 7.0, 6.0, 5.0), does this ticket need to be backported as well? And if so, which versions should it be backported to? &lt;/p&gt;</comment>
                            <comment id="5650390" author="xgen-internal-githook" created="Tue, 22 Aug 2023 14:31:51 +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-79853&quot; title=&quot;[CQF] Generate SBE expression to hash shard key when invoking ShardFilterer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79853&quot;&gt;&lt;del&gt;SERVER-79853&lt;/del&gt;&lt;/a&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;CQF&amp;#93;&lt;/span&gt; Correctly handle hashed shard keys when performing shard filtering&lt;/p&gt;

&lt;p&gt;When a shard key contains a hashed component, the ShardFilterer expects&lt;br/&gt;
us to pass it a value which is also hashed. We achieve this by inserting&lt;br/&gt;
an invocation of the &apos;shardHash&apos; SBE builtin function where necessary.&lt;/p&gt;

&lt;p&gt;This patch also updates the CQF fallback mechanism to enable CQF for&lt;br/&gt;
hashed shard keys when a natural hint is provided and/or there is no&lt;br/&gt;
hashed index backing the shard key (this is allowed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78253&quot; title=&quot;Allow folks with hashed shard keys to drop the hashed index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78253&quot;&gt;&lt;del&gt;SERVER-78253&lt;/del&gt;&lt;/a&gt;).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/694d0aae817b891a3752a9900309c98ce471c5a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/694d0aae817b891a3752a9900309c98ce471c5a8&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2379401">SERVER-78502</issuekey>
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