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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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<item>
            <title>[SERVER-5786] explain() shows non complete plan for sharded query when using compound key</title>
                <link>https://jira.mongodb.org/browse/SERVER-5786</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you specify a query with a compound key with the leading edge being the shard key, and the secondary predicate is _id, then the optimizer performs the proper plan (it doesn&apos;t federate the query), but reports only the secondary predicate index as being read, and doesn&apos;t indicate that the shard key index was read.  The plan would presumably be: read the shard key index, then filter results for secondary key.  But this isn&apos;t indicated in the plan itself.&lt;/p&gt;

&lt;p&gt;Here is a sample session:&lt;br/&gt;
&lt;a href=&quot;https://gist.github.com/2636220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/2636220&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="38086">SERVER-5786</key>
            <summary>explain() shows non complete plan for sharded query when using compound 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="9">Done</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="kennygorman">Kenny Gorman</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 May 2012 15:27:09 +0000</created>
                <updated>Mon, 11 Jul 2016 18:35:44 +0000</updated>
                            <resolved>Wed, 13 Jun 2012 17:56:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="131958" author="aaron" created="Wed, 13 Jun 2012 17:56:08 +0000"  >&lt;p&gt;Hi Kenny.  I&apos;m going to close this ticket.  Please feel free to reopen if you have further questions.&lt;/p&gt;</comment>
                            <comment id="122882" author="aaron" created="Thu, 24 May 2012 20:27:00 +0000"  >&lt;p&gt;Hi Kenny,&lt;/p&gt;

&lt;p&gt;The two fields of the &lt;/p&gt;
{shardkey:111,_id:999}
&lt;p&gt; index are treated as unordered, and the query optimizer is free to use the index on either of those fields to resolve a query.  Since the _id index is unique, it&apos;s generally going to be a good choice for an equality lookup.&lt;/p&gt;</comment>
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