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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-79991] [CQF] Fallback to classic if we have a hashed shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-79991</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &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;, it is possible to have a hashed shard key without a backing index. As we haven&apos;t done &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; yet, we need to explicitly fallback to classic if we encounter a hashed shard key.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2417409">SERVER-79991</key>
            <summary>[CQF] Fallback to classic if we have a hashed shard key</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="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>Mon, 14 Aug 2023 21:34:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:36 +0000</updated>
                            <resolved>Tue, 15 Aug 2023 14:42:37 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5635034" author="xgen-internal-githook" created="Tue, 15 Aug 2023 14:37:40 +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-79991&quot; title=&quot;[CQF] Fallback to classic if we have a hashed shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79991&quot;&gt;&lt;del&gt;SERVER-79991&lt;/del&gt;&lt;/a&gt; Fallback to classic when we encounter a collection with a&lt;br/&gt;
hashed shard key.&lt;/p&gt;

&lt;p&gt;&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; changed the behavior of dropIndexes() to drop hashed&lt;br/&gt;
indexes which are backing hashed shard keys. The fallback mechanism was&lt;br/&gt;
assuming that a hashed shard key will always have a backing hashed&lt;br/&gt;
index; now this assumption is no longer valid. This change explicitly&lt;br/&gt;
falls back when encountering a hashed shard key to account for cases&lt;br/&gt;
where the backing index is dropped.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e081fbfffed44b1db793ec412264d89be91223e1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e081fbfffed44b1db793ec412264d89be91223e1&lt;/a&gt;&lt;/p&gt;</comment>
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