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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-8514] $in count query with null array does not yield error on empty collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-8514</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A count on a collection that exists yields an error on an invalid query. All is good.&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foos.insert(&lt;/p&gt;
{ bars: [ 1, 2 ]}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; db.foos.find({ bars : { $in : [ 1 ]}}).count()&lt;br/&gt;
1&lt;br/&gt;
&amp;gt; db.foos.find({ bars : { $in : null }}).count()&lt;br/&gt;
Mon Feb 11 16:45:53 uncaught exception: count failed: &lt;/p&gt;
{ &quot;errmsg&quot; : &quot;exception: invalid query&quot;, &quot;code&quot; : 12580, &quot;ok&quot; : 0 }

&lt;p&gt;A count on a collection that doesn&apos;t exist yields 0, which is, IMHO, incorrect.&lt;/p&gt;

&lt;p&gt;&amp;gt; db.invalid.find({ bars : { $in : null }}).count()&lt;br/&gt;
0&lt;/p&gt;

&lt;p&gt;This is an odd optimization, I would expect them to fail the same way.&lt;/p&gt;</description>
                <environment>OSX</environment>
        <key id="64900">SERVER-8514</key>
            <summary>$in count query with null array does not yield error on empty collection</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dblock">Daniel Doubrovkine</reporter>
                        <labels>
                            <label>pull-request</label>
                            <label>query_triage</label>
                    </labels>
                <created>Mon, 11 Feb 2013 21:48:03 +0000</created>
                <updated>Mon, 24 Nov 2014 15:00:01 +0000</updated>
                            <resolved>Fri, 14 Nov 2014 20:39:05 +0000</resolved>
                                    <version>2.2.0</version>
                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="764804" author="xgen-internal-githook" created="Fri, 14 Nov 2014 20:36:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;Michael-karn-ivanov&apos;, u&apos;name&apos;: u&apos;Michael Ivanov&apos;, u&apos;email&apos;: u&apos;michael.karn.ivanov@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8514&quot; title=&quot;$in count query with null array does not yield error on empty collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8514&quot;&gt;&lt;del&gt;SERVER-8514&lt;/del&gt;&lt;/a&gt; return error on invalid count query on empty collection&lt;/p&gt;

&lt;p&gt;Closes #783&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a57241b5823968515be18614b1358e4bd7db5acc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a57241b5823968515be18614b1358e4bd7db5acc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="721919" author="david.storch" created="Thu, 18 Sep 2014 14:26:51 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Thanks very much for submitting &lt;a href=&quot;https://github.com/mongodb/mongo/pull/780&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Pull Request #780&lt;/a&gt;! We have reviewed this change, and unfortunately concluded that it is not the correct approach for addressing this issue. When a namespace does not exist, a count operation should&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;return 0 if the query is valid, or&lt;/li&gt;
	&lt;li&gt;fail if the query is invalid.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The correct behavior would look something like this:&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; t = db.&amp;lt;collection&amp;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; t.drop();&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; t.count({a: {$in: [2]}});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; t.count({a: {$in: null}}); // returns an error&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;The bug is that all versions of MongoDB since 2.2.0 return 0 for the latter case:&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; t.count({a: {$in: [2]}});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; t.count({a: {$in: 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;0&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;With this change, the bug is fixed, but valid count queries against a non-existent collection would also fail. Hopefully this explanation makes sense, and feel free to reach out with any further questions.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Dave&lt;/p&gt;</comment>
                            <comment id="283842" author="aaron" created="Thu, 7 Mar 2013 23:59:44 +0000"  >&lt;p&gt;Confirmed that this is still present in 2.2.3.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="33615" name="server8514.js" size="389" author="benety.goh@mongodb.com" created="Fri, 8 Nov 2013 14:04:19 +0000"/>
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