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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-31876] $ne has inconsistent behavior</title>
                <link>https://jira.mongodb.org/browse/SERVER-31876</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;`$ne` has very inconsistent behavior when used with arrays. This behavior also differs when using `$elemMatch`, while the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/query/elemMatch/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;`$elemMatch` docs&lt;/a&gt; state that with one query, the results should be identical.&lt;/p&gt;</description>
                <environment></environment>
        <key id="456355">SERVER-31876</key>
            <summary>$ne has inconsistent behavior</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="jjaco16">Johnny</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Nov 2017 16:51:07 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:06 +0000</updated>
                            <resolved>Fri, 22 Mar 2019 18:01:09 +0000</resolved>
                                    <version>3.4.9</version>
                                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="2188946" author="asya" created="Fri, 22 Mar 2019 18:01:09 +0000"  >&lt;p&gt;Currently the query system is working as designed on examples mentioned in this ticket.&lt;/p&gt;

&lt;p&gt;We should however clarify the null and inequality semantics in our documentation (perhaps with additional examples).&lt;/p&gt;</comment>
                            <comment id="1754857" author="nonagon" created="Mon, 18 Dec 2017 19:30:18 +0000"  >&lt;p&gt;Indeed, this could simply be clarified in the docs. Is it by design that $eq -&amp;gt; $ne becomes a top-level negation? I now see arguments either way.&lt;/p&gt;

&lt;p&gt;My actual use case looked more like this. I had a rather involved query that I had written years ago, something more like:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{field1: value1, field2: value2,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; $or: [{array3.field3: {$gt:8, $lt:100}},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         {array4.field4: {$gt:0}},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         {array5.field5: 7},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         {field6: 200}]}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;array5.field5 could be 7, 8 or 9. I changed the &quot;7&quot; to &quot;{$ne:7}&quot; without rethinking the rest of the query. I was quite surprised when the behavior of the entire query changed (e.g. now I get results where array5 doesn&apos;t even exist), since presumably the $ne negation happened at a higher level.&lt;/p&gt;

&lt;p&gt;On the other hand, my earlier statement about $eq:x and $ne:x partitioning the results is important too. I&apos;m not sure how you would trade those two (or if I&apos;ve fully characterized the problem) but anyway this is what led to the bug report.&lt;/p&gt;</comment>
                            <comment id="1754832" author="asya" created="Mon, 18 Dec 2017 19:06:25 +0000"  >&lt;p&gt;I think the difference is whether the switch from $eq to $ne can be pulled out to a top level negation.  In cases of $elemMatch they cannot be - perhaps additional documentation explanation or maybe just a few more examples would help clarify this?&lt;/p&gt;</comment>
                            <comment id="1754022" author="nonagon" created="Sun, 17 Dec 2017 15:13:00 +0000"  >&lt;p&gt;Hi Asya,&lt;/p&gt;

&lt;p&gt;Sorry about that, I came back to this without looking at it closely enough. Indeed my statement holds for &lt;/p&gt;
{&apos;a.b&apos;:null}
&lt;p&gt; and {&apos;a.b&apos;:{$ne:null}}. It doesn&apos;t hold for {a:{$elemMatch:{b:{$eq:null}}}} and {a:{$elemMatch:{b:{$ne:null}}}}.&lt;/p&gt;

&lt;p&gt;As Johnny mentioned in the stackoverflow post, it seems that &lt;/p&gt;
{&apos;a.b&apos;:null}
&lt;p&gt; applies &lt;/p&gt;
{b:null}
&lt;p&gt; element-wise to the elements of array a. It seems that {&apos;a.b&apos;:{$ne:null}} applies &lt;/p&gt;
{b:null}
&lt;p&gt; element-wise and then applies the &quot;$not&quot; operator to the query as a whole, which was unexpected. If this is by design then indeed I guess the mongo designers agree that my statement should hold, since it&apos;s implemented that way.&lt;/p&gt;

&lt;p&gt;In my case I had a complex query with {$eq:v} buried in it. I needed to change that to {$ne:v} and assumed the rest of the query would behave the same way, but it didn&apos;t.&lt;/p&gt;

&lt;p&gt;$elemMatch seems to consistently work element-wise, but if the above is by design then the docs need clarification under &quot;single query condition&quot; (since $elemMatch is sometimes needed even with a single query condition).&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Jeremy&lt;/p&gt;</comment>
                            <comment id="1753768" author="asya" created="Sat, 16 Dec 2017 21:51:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nonagon&quot; class=&quot;user-hover&quot; rel=&quot;nonagon&quot;&gt;nonagon&lt;/a&gt;,&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;I was expecting that queries of the form &quot;x: null&quot; and &quot;x: {$ne: null}&quot; would partition the documents in a collection, i.e. a document matches &quot;x: null&quot; or &quot;x: {$ne: null}&quot;&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Is there an example where that is not the case?   I tried it with examples given in this ticket and the statement you made holds.&lt;/p&gt;

&lt;p&gt;Asya&lt;/p&gt;</comment>
                            <comment id="1743318" author="nonagon" created="Tue, 5 Dec 2017 18:51:37 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I posted the question to Stack Overflow about this, thanks for taking a look. There are indeed a number of confusing aspects, but I think the most important is this one:&lt;/p&gt;

&lt;p&gt;I was expecting that queries of the form &quot;x: null&quot; and &quot;x: {$ne: null}&quot; would partition the documents in a collection, i.e. a document matches &quot;x: null&quot; or &quot;x: {$ne: null}&quot; (but it does not match neither and it does not match both).&lt;/p&gt;

&lt;p&gt;If x is a field of the document then the above seems to be true. I think this is extremely important and could not possibly change at this point without breaking a lot of deployments, even though the documentation is unclear on it.&lt;/p&gt;

&lt;p&gt;In the case of more complex structures (arrays, nested arrays etc), as Johnny described, the above doesn&apos;t seem to be true, although clearly there are some details which aren&apos;t fully understood (at least by me at this point).&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Jeremy&lt;/p&gt;
</comment>
                            <comment id="1743123" author="jjaco16" created="Tue, 5 Dec 2017 17:02:27 +0000"  >&lt;p&gt;@Asya Kamsky&lt;/p&gt;

&lt;p&gt;Ah yes, I see that now.&lt;/p&gt;

&lt;p&gt;But you do agree that the cases not using $elemMatch are incorrect?&lt;/p&gt;

&lt;p&gt;I assume for the second document/case since b is undefined, this is internally the same as (b : null), which is why it doesn&apos;t match (b : ($ne: null)). But note this goes against what is said in $ne&apos;s documentation: &quot;includes documents that do not contain the field.&quot;&lt;/p&gt;

&lt;p&gt;The third document/case also is very odd, as it works if you remove (d: 1).&lt;/p&gt;</comment>
                            <comment id="1742972" author="asya" created="Tue, 5 Dec 2017 15:56:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jjaco16&quot; class=&quot;user-hover&quot; rel=&quot;jjaco16&quot;&gt;jjaco16&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Please note that &lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.inventory.find({&apos;a.b&apos;:{$elemMatch:{$ne:null}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt; finding nothing is &lt;b&gt;correct&lt;/b&gt; since $elemMatch will only match an array element and &quot;a.b&quot; is &lt;b&gt;not&lt;/b&gt; an array.  &lt;/p&gt;

&lt;p&gt;The format needed to match the third document correctly is:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.inventory.find({a:{$elemMatch:{b:{$ne:null}}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;5a26c071bc6fbcd8b342309b&quot;), &quot;a&quot; : [ { &quot;b&quot; : 1 }, { &quot;d&quot; : 1 } ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1721768" author="mark.agarunov" created="Thu, 9 Nov 2017 17:54:36 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jjaco16&quot; class=&quot;user-hover&quot; rel=&quot;jjaco16&quot;&gt;jjaco16&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the detailed example. I&apos;ve managed to reproduce this issue and I&apos;ve set the fixVersion to &quot;Needs Triage&quot; for this ticket to be scheduled against our currently planned work. Updates will be posted on this ticket as they are available.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1720536" author="jjaco16" created="Wed, 8 Nov 2017 17:01:48 +0000"  >&lt;p&gt;Sorry, didn&apos;t realize I couldn&apos;t edit issue after creating. Please see below for complete reproduction with better formatting. (Or if you can edit this comment into the issue, that&apos;d be better).&lt;/p&gt;

&lt;p&gt;The following all run on mongo 3.4.9 terminal from: &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/tutorial&lt;/a&gt;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt;db.inventory.insertMany([&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;a&quot; : [ ] },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;a&quot; : [ {}] },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;a&quot; : [{ &quot;b&quot; : 1},{ &quot;d&quot; : 1 }] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt;db.inventory.find({&apos;a.b&apos;:{$ne:null}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;a&quot; : [ ] } //why is second document not also accepted? Or the third for that matter?&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt;db.inventory.find({&apos;a.b&apos;:{$elemMatch:{$ne:null}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;//nothing, shouldn&apos;t the third document be accepted?&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;You can see there are several issues here which don&apos;t make sense, and using &lt;tt&gt;elemMatch&lt;/tt&gt; on a single &lt;tt&gt;&amp;lt;query&amp;gt;&lt;/tt&gt; gives different results, against what the docs claim.&lt;/p&gt;

&lt;p&gt;There is a stackoverflow post with more examples here: &lt;a href=&quot;https://stackoverflow.com/q/47112990/3745896&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/q/47112990/3745896&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="339350">SERVER-27442</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="13360">SERVER-1937</issuekey>
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                                        <issuelink>
            <issuekey id="588742">SERVER-36681</issuekey>
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&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt;db.inventory.insertMany([&lt;/span&gt;&lt;/pre&gt;
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