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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-8447] $query with count and $hint not behaving the same as count() and hint() of cursor</title>
                <link>https://jira.mongodb.org/browse/SERVER-8447</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;find({&apos;$query&apos;:{...}}).count() has different result as find(&lt;/p&gt;
{...}
&lt;p&gt;).count() &lt;/p&gt;

&lt;p&gt;Same as for &lt;/p&gt;

&lt;p&gt;and $hint not behaving the same as count() and hint() of cursor&lt;/p&gt;</description>
                <environment>OSX, Linux</environment>
        <key id="64216">SERVER-8447</key>
            <summary>$query with count and $hint not behaving the same as count() and hint() of cursor</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="cheewee.khoo@tisproperty.com">Chee-Wee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Feb 2013 17:12:44 +0000</created>
                <updated>Fri, 15 Feb 2013 15:05:45 +0000</updated>
                            <resolved>Mon, 4 Feb 2013 18:01:39 +0000</resolved>
                                    <version>2.2.2</version>
                    <version>2.2.3</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
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            <issuekey id="47119">SERVER-6767</issuekey>
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                            <customfieldvalue>&lt;p&gt;in mongo shell, Doing this&lt;/p&gt;

&lt;p&gt;db.listing.find(&lt;/p&gt;
{&apos;p_key&apos;: &apos;DhpPsG&apos;}
&lt;p&gt;).count()&lt;/p&gt;

&lt;p&gt;and&lt;/p&gt;

&lt;p&gt;db.listing.find({&apos;$query&apos;: {&apos;p_key&apos;: &apos;DhpPsG&apos;}}).count()&lt;/p&gt;

&lt;p&gt;has different result. The former gives result of 1313 while the latter gives 0.&lt;/p&gt;

&lt;p&gt;--------&lt;/p&gt;

&lt;p&gt;Same as for $hint and hint(). Doing this&lt;/p&gt;

&lt;p&gt;db.listing.find({&apos;$min&apos;: &lt;/p&gt;
{&apos;_id&apos;: &apos;5301fc8327f4f0578d70b24ff6bcc8dd&apos;, &apos;created_on&apos;: ISODate(&quot;2012-12-26T05:14:35.834Z&quot;)}
&lt;p&gt;, &apos;$query&apos;: {&apos;p_key&apos;: &apos;DhpPsG&apos;}}).hint(&lt;/p&gt;
{&apos;p_key&apos;: 1}
&lt;p&gt;).sort(&lt;span class=&quot;error&quot;&gt;&amp;#91;(&amp;quot;created_on&amp;quot;, 1), (&amp;quot;_id&amp;quot;, 1)&amp;#93;&lt;/span&gt;).explain()&lt;/p&gt;

&lt;p&gt;uses the index as I expected but doing this&lt;/p&gt;

&lt;p&gt;db.listing.find({&apos;$min&apos;: &lt;/p&gt;
{&apos;_id&apos;: &apos;5301fc8327f4f0578d70b24ff6bcc8dd&apos;, &apos;created_on&apos;: ISODate(&quot;2012-12-26T05:14:35.834Z&quot;)}
&lt;p&gt;, &apos;$query&apos;: &lt;/p&gt;
{&apos;p_key&apos;: &apos;DhpPsG&apos;}
&lt;p&gt;, &apos;$hint&apos;:{&apos;p_key&apos;: 1}}).sort(&lt;span class=&quot;error&quot;&gt;&amp;#91;(&amp;quot;created_on&amp;quot;, 1), (&amp;quot;_id&amp;quot;, 1)&amp;#93;&lt;/span&gt;).explain()&lt;/p&gt;

&lt;p&gt;does not use the index as I expected.&lt;/p&gt;


&lt;p&gt;The result of former is:&lt;br/&gt;
{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BtreeCursor p_key_1&quot;,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
	&quot;n&quot; : 0,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 83260,&lt;br/&gt;
	&quot;nscanned&quot; : 83260,&lt;br/&gt;
	&quot;nscannedObjectsAllPlans&quot; : 83260,&lt;br/&gt;
	&quot;nscannedAllPlans&quot; : 83260,&lt;br/&gt;
	&quot;scanAndOrder&quot; : false,&lt;br/&gt;
	&quot;indexOnly&quot; : false,&lt;br/&gt;
	&quot;nYields&quot; : 0,&lt;br/&gt;
	&quot;nChunkSkips&quot; : 0,&lt;br/&gt;
	&quot;millis&quot; : 379,&lt;br/&gt;
	&quot;indexBounds&quot; : {&lt;br/&gt;
		&quot;p_key&quot; : [&lt;br/&gt;
			[&lt;br/&gt;
				&lt;/p&gt;
{
					&quot;$minElement&quot; : 1
				}
&lt;p&gt;,&lt;/p&gt;
				{
					&quot;$maxElement&quot; : 1
				}
&lt;p&gt;			]&lt;br/&gt;
		]&lt;br/&gt;
	},&lt;br/&gt;
	&quot;server&quot; : &quot;mbp.local:27017&quot;&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;the result of latter is:&lt;br/&gt;
{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BasicCursor&quot;,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
	&quot;n&quot; : 0,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 83260,&lt;br/&gt;
	&quot;nscanned&quot; : 83260,&lt;br/&gt;
	&quot;nscannedObjectsAllPlans&quot; : 83260,&lt;br/&gt;
	&quot;nscannedAllPlans&quot; : 83260,&lt;br/&gt;
	&quot;scanAndOrder&quot; : false,&lt;br/&gt;
	&quot;indexOnly&quot; : false,&lt;br/&gt;
	&quot;nYields&quot; : 1,&lt;br/&gt;
	&quot;nChunkSkips&quot; : 0,&lt;br/&gt;
	&quot;millis&quot; : 620,&lt;br/&gt;
	&quot;indexBounds&quot; : {&lt;/p&gt;

&lt;p&gt;	},&lt;br/&gt;
	&quot;server&quot; : &quot;mbp.local:27017&quot;&lt;br/&gt;
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