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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-2342] $within: {$center} vs. $near and $maxDistance</title>
                <link>https://jira.mongodb.org/browse/SERVER-2342</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Shouldn&apos;t these two types of queries return the same results? They don&apos;t always. Why not?&lt;/p&gt;

&lt;p&gt;Attached is a zip code database you can use to test.&lt;/p&gt;

&lt;p&gt;Here are two queries:&lt;/p&gt;

&lt;p&gt;&amp;gt; use geo&lt;br/&gt;
&amp;gt; db.zips.find({&apos;loc&apos;: {$near: &lt;/p&gt;
{x: 40.752315, y: -73.977842}
&lt;p&gt;, $maxDistance: 0.01}}).count() &lt;br/&gt;
3&lt;/p&gt;

&lt;p&gt;&amp;gt; db.zips.find({loc: {$within: {$center: [ &lt;span class=&quot;error&quot;&gt;&amp;#91;40.752315, -73.977842&amp;#93;&lt;/span&gt;, 0.01 ] }}}).count() &lt;br/&gt;
25&lt;/p&gt;

&lt;p&gt;But...&lt;/p&gt;

&lt;p&gt;&amp;gt; db.zips.find({&apos;loc&apos;: {$near: &lt;/p&gt;
{x: 40.752315, y: -73.977842}
&lt;p&gt;, $maxDistance: 0.011 }}).count() &lt;br/&gt;
26&lt;/p&gt;

&lt;p&gt;&amp;gt; db.zips.find({loc: {$within: {$center: [ &lt;span class=&quot;error&quot;&gt;&amp;#91;40.752315, -73.977842&amp;#93;&lt;/span&gt;, 0.011 ] }}}).count() &lt;br/&gt;
26&lt;/p&gt;

&lt;p&gt;If they&apos;re supposed to return the same results, why have them both? If they&apos;re not, what&apos;s sort of meaningful distinction is there between them?&lt;/p&gt;</description>
                <environment></environment>
        <key id="14190">SERVER-2342</key>
            <summary>$within: {$center} vs. $near and $maxDistance</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="kbanker">Kyle Banker</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Jan 2011 16:08:31 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:57 +0000</updated>
                            <resolved>Thu, 27 Jan 2011 19:57:10 +0000</resolved>
                                    <version>1.7.4</version>
                                    <fixVersion>1.7.6</fixVersion>
                                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="22749" author="auto" created="Thu, 27 Jan 2011 19:56:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: fix $near with $maxDistance &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2342&quot; title=&quot;$within: {$center} vs. $near and $maxDistance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2342&quot;&gt;&lt;del&gt;SERVER-2342&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/669b2f2dd36b11e17ae4ab21c2fdfec958ac72b9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/669b2f2dd36b11e17ae4ab21c2fdfec958ac72b9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="22218" author="scotthernandez" created="Mon, 10 Jan 2011 16:40:01 +0000"  >&lt;p&gt;Isn&apos;t the difference here whether the $maxDistance value is inclusive or exclusive? In the $near case it is not, and for $whithin it is.&lt;/p&gt;

&lt;p&gt;This is how I understood things to work.&lt;/p&gt;

&lt;p&gt;Is there something more going on?&lt;/p&gt;</comment>
                            <comment id="22217" author="redbeard0531" created="Mon, 10 Jan 2011 16:33:32 +0000"  >&lt;p&gt;I think these are related. The handling of $maxDistance is off.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="13984">SERVER-2234</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="14188">SERVER-2341</issuekey>
        </issuelink>
                            </inwardlinks>
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                            <attachment id="10712" name="geo.dump" size="954057" author="kbanker" created="Mon, 10 Jan 2011 16:08:55 +0000"/>
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