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    <title>MongoDB Jira</title>
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    <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-8551] Exists query with a sparse index should have nscannedObjects = 0</title>
                <link>https://jira.mongodb.org/browse/SERVER-8551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An exists query on a sparse index field has indexOnly true but nscannedObjects &amp;gt; 0&lt;br/&gt;
The test case below asserts&lt;br/&gt;
assert: &lt;span class=&quot;error&quot;&gt;&amp;#91;0&amp;#93;&lt;/span&gt; != &lt;span class=&quot;error&quot;&gt;&amp;#91;13&amp;#93;&lt;/span&gt; are not equal : simple.3.7 - nscannedObjects should be 0 for covered query&lt;/p&gt;</description>
                <environment>2.4.0-rc0 on OS X</environment>
        <key id="65171">SERVER-8551</key>
            <summary>Exists query with a sparse index should have nscannedObjects = 0</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="sridhar">Sridhar Nanjundeswaran</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Feb 2013 19:24:54 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:26 +0000</updated>
                            <resolved>Wed, 13 Feb 2013 19:38:43 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="265429" author="aaron" created="Wed, 13 Feb 2013 19:38:31 +0000"  >&lt;p&gt;Hi Sridhar - Pretty much the same story here as with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8549&quot; title=&quot;Not in covered index query does not have nscannedObjects = 0 &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8549&quot;&gt;&lt;del&gt;SERVER-8549&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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&lt;p&gt;testDB = db.getSiblingDB(&quot;qa293&quot;)&lt;br/&gt;
var coll = testDB.getCollection(&quot;simple.3&quot;)&lt;br/&gt;
coll.drop()&lt;br/&gt;
for (i=0;i&amp;lt;10;i++) {&lt;br/&gt;
    coll.insert(&lt;/p&gt;
{foo:i}
&lt;p&gt;)&lt;br/&gt;
}&lt;br/&gt;
for (i=0;i&amp;lt;5;i++) {&lt;br/&gt;
    coll.insert(&lt;/p&gt;
{bar:i}
&lt;p&gt;)&lt;br/&gt;
}&lt;br/&gt;
coll.insert(&lt;/p&gt;
{foo:&quot;1&quot;}
&lt;p&gt;)&lt;br/&gt;
coll.insert({foo:{bar:1}})&lt;br/&gt;
coll.insert(&lt;/p&gt;
{foo:null}
&lt;p&gt;)&lt;br/&gt;
coll.ensureIndex(&lt;/p&gt;
{foo:1}
&lt;p&gt;, &lt;/p&gt;
{sparse:true, unique:true}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;// Test exists query&lt;br/&gt;
var plan = coll.find({foo:{$exists:true}}, &lt;/p&gt;
{foo:1, _id:0}
&lt;p&gt;).hint(&lt;/p&gt;
{foo:1}
&lt;p&gt;).explain()&lt;br/&gt;
assert.eq(true, plan.indexOnly, &quot;simple.3.7 - indexOnly should be true on covered query&quot;)&lt;br/&gt;
assert.eq(0, plan.nscannedObjects, &quot;simple.3.7 - nscannedObjects should be 0 for covered query&quot;)&lt;/p&gt;</customfieldvalue>

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