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    <title>MongoDB Jira</title>
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    <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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            <title>[SERVER-82471] Make sure explain.find issued on mongos sends a modified query to the shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-82471</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While mongos sends &lt;a href=&quot;https://github.com/mongodb/mongo/blob/626e868347d58a9a647a50547533095deed0af96/src/mongo/s/query/cluster_find.cpp#L151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;modified find query to shards&lt;/a&gt; (as part of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/626e868347d58a9a647a50547533095deed0af96/src/mongo/s/commands/cluster_find_cmd.h#L241&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ClusterFind::runQuery()&lt;/a&gt;), it does so only when the command has to be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/626e868347d58a9a647a50547533095deed0af96/src/mongo/s/commands/cluster_find_cmd.h#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;executed&lt;/a&gt; and not &lt;a href=&quot;https://github.com/mongodb/mongo/blob/626e868347d58a9a647a50547533095deed0af96/src/mongo/s/commands/cluster_find_cmd.h#L143&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explained&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This causes confusion for users as well as developers and make you not trust in explain output, as it is not the same plan.&lt;/p&gt;

&lt;p&gt;As well as this makes testing harder, as explained plan is not the same as the plan found in the $planCacheStats&lt;/p&gt;

&lt;p&gt;It&apos;s worth mentioning that since queries in run and explain are different, so are their queryHashes, therefore once can not run explain, retrieve the queryHash and look for the queries in $planCacheStats or slow query logs, as they are different.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This issue goes back in time, to at least 3.4.4, so it&apos;s a very old bug.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2483735">SERVER-82471</key>
            <summary>Make sure explain.find issued on mongos sends a modified query to the shards</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="denis.grebennicov@mongodb.com">Denis Grebennicov</reporter>
                        <labels>
                            <label>quick-win</label>
                            <label>tech-debt</label>
                    </labels>
                <created>Thu, 26 Oct 2023 17:12:57 +0000</created>
                <updated>Fri, 17 Nov 2023 14:12:00 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                    <issuelinks>
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                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="390325">SERVER-29449</issuekey>
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            <issuekey id="479343">SERVER-32563</issuekey>
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            <issuekey id="2475300">SERVER-82218</issuekey>
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