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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>
    </build-info>


<item>
            <title>[SERVER-11278] indexOnly false when query should be covered</title>
                <link>https://jira.mongodb.org/browse/SERVER-11278</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Index does not have fields that are sub documents or arrays and indexOnly is false on what should be a covered query&lt;/p&gt;</description>
                <environment>Linux</environment>
        <key id="94918">SERVER-11278</key>
            <summary>indexOnly false when query should be covered</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="-1">Unassigned</assignee>
                                    <reporter username="davidluvit">David Wartell</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Oct 2013 23:20:20 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:00 +0000</updated>
                            <resolved>Sat, 19 Oct 2013 02:00:45 +0000</resolved>
                                    <version>2.4.6</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="443353" author="davidluvit" created="Fri, 18 Oct 2013 23:41:51 +0000"  >&lt;p&gt;Please CLOSE.  Not a bug.&lt;/p&gt;

&lt;p&gt;Apologies I was convinced this was a bug.  &lt;/p&gt;

&lt;p&gt;This was the problem:&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/create-indexes-to-support-queries/#indexes-covered-queries&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/tutorial/create-indexes-to-support-queries/#indexes-covered-queries&lt;/a&gt;&lt;br/&gt;
By default, MongoDB includes the _id field in the query result. So, if the index does not include the _id field, then you must exclude the _id field (i.e. _id: 0) from the query results.&lt;/p&gt;

&lt;p&gt;By adding _id: 0 to the projection I get indexOnly true&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;db.Test.insert(&lt;/p&gt;
{&quot;_id&quot; : ObjectId(&quot;5261ac33e4b070ca9e1480d1&quot;), &quot;date&quot; : ISODate(&quot;2013-10-18T21:46:27.476Z&quot;), &quot;disabled&quot; : false, &quot;userHidden&quot; : false, &quot;postId&quot; : NumberLong(103)}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt; db.Test.ensureIndex(&lt;/p&gt;
{ &quot;postId&quot; : 1, &quot;userHidden&quot; : 1, &quot;disabled&quot; : 1, &quot;date&quot; : -1}
&lt;p&gt;, &lt;/p&gt;
{name: &quot;findByPostId&quot;, sparse: true, unique: false}
&lt;p&gt;)&lt;/p&gt;


&lt;p&gt;db.Test.find( { $query: &lt;/p&gt;
{postId: 103, userHidden: false, disabled: false}
&lt;p&gt;, $orderby: &lt;/p&gt;
{date: -1}
&lt;p&gt;, $hint: &quot;findByPostId&quot;, $explain: 1 }, &lt;/p&gt;
{postId: 1, userHidden: 1, disabled: 1, date: 1 }
&lt;p&gt;  ).pretty()&lt;/p&gt;


&lt;p&gt;{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor findByPostId&quot;,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;n&quot; : 1,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 1,&lt;br/&gt;
        &quot;nscanned&quot; : 1,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 1,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 1,&lt;br/&gt;
        &quot;scanAndOrder&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : false,&lt;br/&gt;
        &quot;nYields&quot; : 0,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;millis&quot; : 0,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;br/&gt;
                &quot;postId&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                103,&lt;br/&gt;
                                103&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;userHidden&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                false,&lt;br/&gt;
                                false&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;disabled&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                false,&lt;br/&gt;
                                false&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;date&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &lt;/p&gt;
{
                                        &quot;$maxElement&quot; : 1
                                }
&lt;p&gt;,&lt;/p&gt;
                                {
                                        &quot;$minElement&quot; : 1
                                }
&lt;p&gt;                        ]&lt;br/&gt;
                ]&lt;br/&gt;
        },&lt;br/&gt;
        &quot;allPlans&quot; : [&lt;br/&gt;
                {&lt;br/&gt;
                        &quot;cursor&quot; : &quot;BtreeCursor findByPostId&quot;,&lt;br/&gt;
                        &quot;n&quot; : 1,&lt;br/&gt;
                        &quot;nscannedObjects&quot; : 1,&lt;br/&gt;
                        &quot;nscanned&quot; : 1,&lt;br/&gt;
                        &quot;indexBounds&quot; : {&lt;br/&gt;
                                &quot;postId&quot; : [&lt;br/&gt;
                                        [&lt;br/&gt;
                                                103,&lt;br/&gt;
                                                103&lt;br/&gt;
                                        ]&lt;br/&gt;
                                ],&lt;br/&gt;
                                &quot;userHidden&quot; : [&lt;br/&gt;
                                        [&lt;br/&gt;
                                                false,&lt;br/&gt;
                                                false&lt;br/&gt;
                                        ]&lt;br/&gt;
                                ],&lt;br/&gt;
                                &quot;disabled&quot; : [&lt;br/&gt;
                                        [&lt;br/&gt;
                                                false,&lt;br/&gt;
                                                false&lt;br/&gt;
                                        ]&lt;br/&gt;
                                ],&lt;br/&gt;
                                &quot;date&quot; : [&lt;br/&gt;
                                        [&lt;br/&gt;
                                                &lt;/p&gt;
{
                                                        &quot;$maxElement&quot; : 1
                                                }
&lt;p&gt;,&lt;/p&gt;
                                                {
                                                        &quot;$minElement&quot; : 1
                                                }
&lt;p&gt;                                        ]&lt;br/&gt;
                                ]&lt;br/&gt;
                        }&lt;br/&gt;
                }&lt;br/&gt;
        ],&lt;br/&gt;
        &quot;server&quot; : &quot;test-mongo.luvit.net:270&quot;&lt;br/&gt;
}&lt;/p&gt;


&lt;p&gt;According to docs and everything I can find there is no reason this query should not be indexOnly: true  and it is false&lt;/p&gt;</customfieldvalue>

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