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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-8026] When an index is present, $not operator doesn&apos;t return documents that don&apos;t contain this field</title>
                <link>https://jira.mongodb.org/browse/SERVER-8026</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using the $not operator on an indexed &apos;date&apos; field, only documents that contain this field are returned, while documents that do not contain this field (and should therefore be returned), are ignored. &lt;/p&gt;

&lt;p&gt;Please see steps to reproduce for details.&lt;/p&gt;</description>
                <environment></environment>
        <key id="60294">SERVER-8026</key>
            <summary>When an index is present, $not operator doesn&apos;t return documents that don&apos;t contain this field</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="guyz">Guy Zyskind</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Dec 2012 16:38:12 +0000</created>
                <updated>Fri, 15 Feb 2013 15:05:58 +0000</updated>
                            <resolved>Wed, 26 Dec 2012 18:38:42 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="224678" author="aaron" created="Wed, 26 Dec 2012 18:38:32 +0000"  >&lt;p&gt;Hi Guy - This is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7261&quot; title=&quot;field range with $not should properly account for type bracketing (query with $not returns different results after adding an index)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7261&quot;&gt;&lt;del&gt;SERVER-7261&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="223427" author="guyz" created="Mon, 24 Dec 2012 16:40:53 +0000"  >&lt;p&gt;Currently my workaround is to use $or with 1. $exists: false, 2. $gt/$lt.&lt;/p&gt;

&lt;p&gt;Unfortunately, this appears to significantly reduce performance, so a fix to this bug is still necessary.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;// 1. Insert these 3 rows:&lt;br/&gt;
db.testNotIndex.insert(&lt;/p&gt;
{&quot;date&quot;: ISODate(&quot;2012-12-21T16:03:08.428Z&quot;) }
&lt;p&gt;)&lt;br/&gt;
db.testNotIndex.insert(&lt;/p&gt;
{&quot;date&quot;: ISODate(&quot;2012-12-21T17:03:08.428Z&quot;) }
&lt;p&gt;)&lt;br/&gt;
db.testNotIndex.insert(&lt;/p&gt;
{&quot;a&quot;: 1 }
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;// 2. Without an index, 2 results are returned as expected for &apos;d&apos;&lt;br/&gt;
var d = ISODate(&quot;2012-12-21T17:33:08.428Z&quot;);&lt;br/&gt;
var c1 = db.testNotIndex.count({&quot;date&quot;: {$not:{$lte:ISODate(&quot;2012-12-21T16:33:08.428Z&quot;)}} });&lt;/p&gt;

&lt;p&gt;// 3. Using an index, only 1 result is returned when issuing the same query. Documents without the &apos;date&apos; field are ignored.&lt;br/&gt;
db.testNotIndex.ensureIndex(&lt;/p&gt;
{date: 1}
&lt;p&gt;)&lt;br/&gt;
var c2 = db.testNotIndex.count({&quot;date&quot;: {$not:{$lte:ISODate(&quot;2012-12-21T16:33:08.428Z&quot;)}} });&lt;/p&gt;

&lt;p&gt;// ( 2 == 1 ) == false&lt;br/&gt;
assert( c1 == c2 );&lt;/p&gt;</customfieldvalue>

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