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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-44773] Optimise queries to cover on sharded clusters when using compound hashed index</title>
                <link>https://jira.mongodb.org/browse/SERVER-44773</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When compound hashed shard key has a range prefix, if the query predicate is on the prefix and the projection doesn&apos;t include hashed fields then the query can be covered. &lt;/p&gt;

&lt;p&gt;The current behaviour for hashed shard keys is, we always fetch the documents on the shards to make sure that the document is not an orphan. When the projection and query doesn&apos;t include hashed fields, the document fetch can be avoided. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1018695">SERVER-44773</key>
            <summary>Optimise queries to cover on sharded clusters when using compound hashed index</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="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="arun.banala@mongodb.com">Arun Banala</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Nov 2019 17:42:15 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:43 +0000</updated>
                            <resolved>Wed, 22 Jan 2020 11:42:41 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2751203" author="xgen-internal-githook" created="Wed, 22 Jan 2020 11:40:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;banarun&apos;, &apos;name&apos;: &apos;Arun Banala&apos;, &apos;email&apos;: &apos;arun.banala@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44773&quot; title=&quot;Optimise queries to cover on sharded clusters when using compound hashed index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44773&quot;&gt;&lt;del&gt;SERVER-44773&lt;/del&gt;&lt;/a&gt; Optimise queries to cover on sharded clusters when using compound hashed index&lt;/p&gt;

&lt;p&gt; create mode 100644 jstests/sharding/compound_hashed_shard_key_covered_query.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ef35c34b92e50e0438abeb2ffc83ff1472dd7d64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ef35c34b92e50e0438abeb2ffc83ff1472dd7d64&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2561799" author="david.storch" created="Fri, 22 Nov 2019 14:47:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=arun.banala&quot; class=&quot;user-hover&quot; rel=&quot;arun.banala&quot;&gt;arun.banala&lt;/a&gt; can you provide a description for this ticket? Thanks!&lt;/p&gt;</comment>
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