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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-12661] Unable to determine if field is of type array when field name is all numeric characters</title>
                <link>https://jira.mongodb.org/browse/SERVER-12661</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;BSON allows for a field name to be all numeric characters.  For example:&lt;/p&gt;

&lt;p&gt;{ &quot;_id&quot; : 102, &quot;0&quot; : [  &quot;Junk&quot;,  &quot;Garbage&quot;,  &quot;ETC&quot; ], &quot;name&quot; : &lt;/p&gt;
{ &quot;first&quot; : &quot;John&quot;, &quot;last&quot; : &quot;Backus&quot; }
&lt;p&gt;, &quot;birth&quot; : ISODate(&quot;1924-12-03T05:00:00Z&quot;), &quot;death&quot; : ISODate(&quot;2007-03-17T04:00:00Z&quot;), &quot;contribs&quot; : [  &quot;Fortran&quot;,  &quot;ALGOL&quot;,  &quot;Backus-Naur Form&quot;,  &quot;FP&quot; ], &quot;awards&quot; : [        &lt;/p&gt;
{       &quot;award&quot; : &quot;W.W. McDowell Award&quot;,     &quot;year&quot; : 1967,  &quot;by&quot; : &quot;IEEE Computer Society&quot; }
&lt;p&gt;,       &lt;/p&gt;
{       &quot;award&quot; : &quot;National Medal of Science&quot;,  &quot;year&quot; : 1975,  &quot;by&quot; : &quot;National Science Foundation&quot; }
&lt;p&gt;,      &lt;/p&gt;
{       &quot;award&quot; : &quot;Turing Award&quot;,       &quot;year&quot; : 1977,  &quot;by&quot; : &quot;ACM&quot; }
&lt;p&gt;,         &lt;/p&gt;
{       &quot;award&quot; : &quot;Draper Prize&quot;,    &quot;year&quot; : 1993,  &quot;by&quot; : &quot;National Academy of Engineering&quot; }
&lt;p&gt; ] }&lt;/p&gt;

&lt;p&gt;I am currently working on a system where I need to evaluate every field in a mongo document at every level of the document.  One of the pieces of data I collect about each field is whether or not the field is an array.&lt;/p&gt;

&lt;p&gt;In my simple example above, If I want to determine that field &quot;0&quot; is an array, I execute the following:&lt;/p&gt;

&lt;p&gt;db.people.find({$where : &quot;Array.isArray(this.0)&quot;})&lt;/p&gt;

&lt;p&gt;This results in an error:  &lt;br/&gt;
error: &lt;/p&gt;
{ &quot;$err&quot; : &quot;SyntaxError: Unexpected number&quot;, &quot;code&quot; : 16722 }

&lt;p&gt;I&apos;ve scoured the internet trying to find an alternative way to get this information, but I&apos;ve not been successful.  Is there another way to determine whether a field is an array in scenario where the field name all numeric characters?&lt;/p&gt;

&lt;p&gt;Thanks&lt;/p&gt;</description>
                <environment></environment>
        <key id="110160">SERVER-12661</key>
            <summary>Unable to determine if field is of type array when field name is all numeric characters</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="bmiller1009">Brad Miller</reporter>
                        <labels>
                            <label>query</label>
                    </labels>
                <created>Sun, 9 Feb 2014 04:01:13 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:18 +0000</updated>
                            <resolved>Sun, 9 Feb 2014 05:58:54 +0000</resolved>
                                    <version>2.4.7</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="495873" author="bmiller1009" created="Sun, 9 Feb 2014 18:41:42 +0000"  >&lt;p&gt;Excellent....works perfectly.  Thank you so much for the quick reply.&lt;/p&gt;</comment>
                            <comment id="495827" author="asya" created="Sun, 9 Feb 2014 05:58:23 +0000"  >&lt;p&gt;Also it works if you make 0 quoted via&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;   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.people.find({$where : &quot;Array.isArray(this[&apos;0&apos;])&quot;})&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="495826" author="asya" created="Sun, 9 Feb 2014 05:56:05 +0000"  >&lt;p&gt;You can use:&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.people.find({&quot;0.0&quot;:{$exists:true}}).count()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.people.find({&quot;awards.0&quot;:{$exists:true}}).count()&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;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;db.people.find({&quot;name.0&quot;:{$exists:true}}).count()&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;</comment>
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