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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-37690] countDocuments throws an error when matching 0 document</title>
                <link>https://jira.mongodb.org/browse/SERVER-37690</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;`countDocuments` throws an error when matching 0 document.&lt;/p&gt;

&lt;p&gt;I would have expected it to follow what `count` does, which is return 0.&lt;/p&gt;

&lt;p&gt;With both versions `4.0.3` and `4.1.4` (haven&apos;t checked intermediary ones), the error I get from the bellow `steps to reproduce` 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;
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				&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;2018-10-20T16:26:44.252+0100 E QUERY [js] TypeError: res[0] is undefined :&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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; DBCollection.prototype.countDocuments@src/mongo/shell/collection.js:1418:5&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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; @(shell):1:1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="621989">SERVER-37690</key>
            <summary>countDocuments throws an error when matching 0 document</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13201">Fixed</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="x.guihot@gmail.com">Xavier GUIHOT</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                            <label>storch</label>
                    </labels>
                <created>Sat, 20 Oct 2018 15:29:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:16 +0000</updated>
                            <resolved>Tue, 20 Aug 2019 02:11:58 +0000</resolved>
                                    <version>4.0.3</version>
                    <version>4.1.4</version>
                                    <fixVersion>4.0.13</fixVersion>
                    <fixVersion>4.2.1</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2419827" author="xgen-internal-githook" created="Fri, 13 Sep 2019 17:12:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37690&quot; title=&quot;countDocuments throws an error when matching 0 document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37690&quot;&gt;&lt;del&gt;SERVER-37690&lt;/del&gt;&lt;/a&gt; Return 0 from countDocuments for empty collection&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d4f511978cbd5e425c0941cd3cda2cf9d5e03716&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d4f511978cbd5e425c0941cd3cda2cf9d5e03716&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2419764" author="xgen-internal-githook" created="Fri, 13 Sep 2019 16:33:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37690&quot; title=&quot;countDocuments throws an error when matching 0 document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37690&quot;&gt;&lt;del&gt;SERVER-37690&lt;/del&gt;&lt;/a&gt; Return 0 from countDocuments for empty collection&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e978f6d7f1f304626f71bf6cf908cfaed08c19d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e978f6d7f1f304626f71bf6cf908cfaed08c19d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2402628" author="david.storch" created="Sat, 31 Aug 2019 00:35:42 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ravind.kumar&quot; class=&quot;user-hover&quot; rel=&quot;ravind.kumar&quot;&gt;ravind.kumar&lt;/a&gt; I think we should backport this change to 4.2, since it would be nice to get this simple fix available in the most recent stable branch. I&apos;m less sure about 4.0. I&apos;ll request backport to 4.0 and 4.2, and the query team will discuss during our next triage meeting.&lt;/p&gt;</comment>
                            <comment id="2378786" author="jesse" created="Tue, 20 Aug 2019 13:37:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; do you have an opinion about backporting? &lt;/p&gt;</comment>
                            <comment id="2378779" author="ravind.kumar" created="Tue, 20 Aug 2019 13:28:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt; is there any intent to backport these changes? Just curious. &lt;/p&gt;</comment>
                            <comment id="2378262" author="xgen-internal-githook" created="Tue, 20 Aug 2019 02:03:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37690&quot; title=&quot;countDocuments throws an error when matching 0 document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37690&quot;&gt;&lt;del&gt;SERVER-37690&lt;/del&gt;&lt;/a&gt; Return 0 from countDocuments for empty collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d648da63525c58f7a842e0366066841dcecaabb5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d648da63525c58f7a842e0366066841dcecaabb5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2128936" author="mfi" created="Mon, 28 Jan 2019 11:42:06 +0000"  >&lt;p&gt;I can confirm this behaviour on 4.0.5.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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            <issuekey id="741274">SERVER-40718</issuekey>
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                            <customfieldvalue>The shell&amp;#39;s countDocuments method had thrown an uninformative error if the collection is empty or does not exist, or if its filter expression matches no documents. Now it will return 0, the same as drivers do in these scenarios.</customfieldvalue>

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&lt;p&gt;use count&lt;/p&gt;

&lt;p&gt;db.count.insert(&lt;span class=&quot;error&quot;&gt;&amp;#91;\{a: 1}, \{a: 2}&amp;#93;&lt;/span&gt;)&lt;/p&gt;

&lt;p&gt;db.count.count({a:1}) // returns 1&lt;/p&gt;

&lt;p&gt;db.count.count({a:3}) // returns 0&lt;/p&gt;

&lt;p&gt;db.count.countDocuments({a:1}) // returns 1&lt;/p&gt;

&lt;p&gt;db.count.countDocuments({a:3}) // throws an exception&lt;/p&gt;

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