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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>
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<item>
            <title>[SERVER-4493] v0 indexes store empty arrays as nulls and the documents containing them may be improperly returned or counted when the matcher is bypassed</title>
                <link>https://jira.mongodb.org/browse/SERVER-4493</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Has been fixed in v1 indexes.  Mostly creating a ticket for this so we can track the issue if reported by users.&lt;/p&gt;

&lt;p&gt;Here is the problem for v0 indexes:&lt;/p&gt;

&lt;p&gt;&amp;gt; c.drop()&lt;br/&gt;
true&lt;br/&gt;
&amp;gt; c.ensureIndex(&lt;/p&gt;
{a:1}
&lt;p&gt;,&lt;/p&gt;
{v:0}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.save(&lt;/p&gt;
{a:[]}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null}
&lt;p&gt;) // key matching only&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4ee8f8d00cf334c01d36adc3&quot;), &quot;a&quot; : [ ] }
&lt;p&gt;&amp;gt; c.find(&lt;/p&gt;
{a:null,b:null}
&lt;p&gt;) // match full doc - [] not matching null&lt;br/&gt;
&amp;gt; c.count(&lt;/p&gt;
{a:null}
&lt;p&gt;) // fast count bypasses matcher&lt;br/&gt;
1&lt;br/&gt;
&amp;gt; c.save(&lt;/p&gt;
{a:[1,2]}
&lt;p&gt;) // make the index multikey&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null}
&lt;p&gt;) // key matching does not occur for multikey indexes, so match full doc&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null,b:null}
&lt;p&gt;) // match full doc&lt;br/&gt;
&amp;gt; c.count(&lt;/p&gt;
{a:null}
&lt;p&gt;) // fast count bypasses matcher&lt;br/&gt;
1&lt;/p&gt;

&lt;p&gt;We&apos;ve fixed it for v1 indexes:&lt;/p&gt;

&lt;p&gt;&amp;gt; c.drop()&lt;br/&gt;
true&lt;br/&gt;
&amp;gt; c.ensureIndex(&lt;/p&gt;
{a:1}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.save(&lt;/p&gt;
{a:[]}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null,b:null}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.count(&lt;/p&gt;
{a:null}
&lt;p&gt;)&lt;br/&gt;
0&lt;br/&gt;
&amp;gt; c.save(&lt;/p&gt;
{a:[1,2]}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.find(&lt;/p&gt;
{a:null,b:null}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; c.count(&lt;/p&gt;
{a:null}
&lt;p&gt;)&lt;br/&gt;
0&lt;br/&gt;
&amp;gt; &lt;/p&gt;</description>
                <environment></environment>
        <key id="26609">SERVER-4493</key>
            <summary>v0 indexes store empty arrays as nulls and the documents containing them may be improperly returned or counted when the matcher is bypassed</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Dec 2011 19:33:54 +0000</created>
                <updated>Thu, 3 Dec 2015 23:34:18 +0000</updated>
                            <resolved>Thu, 3 Dec 2015 23:34:18 +0000</resolved>
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                                        <votes>0</votes>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="26582">SERVER-4491</issuekey>
        </issuelink>
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