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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>
    </build-info>


<item>
            <title>[SERVER-2702] Compare document fields in queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-2702</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be rather handy to do things like :&lt;/p&gt;

&lt;p&gt;db.test.find({a:{$gt:b}})&lt;/p&gt;

&lt;p&gt;In other words, be able to query based on document fields comparison. Any plans for this?&lt;/p&gt;</description>
                <environment></environment>
        <key id="15034">SERVER-2702</key>
            <summary>Compare document fields in queries</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="remonvv">Remon van Vliet</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Mar 2011 15:24:00 +0000</created>
                <updated>Tue, 5 Dec 2017 19:23:14 +0000</updated>
                            <resolved>Thu, 5 Oct 2017 21:01:52 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>35</votes>
                                    <watches>28</watches>
                                                                                                                <comments>
                            <comment id="1691521" author="david.storch" created="Fri, 6 Oct 2017 15:23:03 +0000"  >&lt;p&gt;The feature described by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; above was implemented in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30731&quot; title=&quot;Add $expr support in MatchExpression outside of aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30731&quot;&gt;&lt;del&gt;SERVER-30731&lt;/del&gt;&lt;/a&gt; and will be available in upcoming version 3.6.0-rc0. The reference page for &lt;tt&gt;$expr&lt;/tt&gt; is available here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/master/reference/operator/query/expr/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/reference/operator/query/expr/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1690832" author="tess.avitabile" created="Thu, 5 Oct 2017 21:01:31 +0000"  >&lt;p&gt;This can now be done using &lt;tt&gt;$expr&lt;/tt&gt;, which allows you to use aggregation expressions in the match language:&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; db.coll.insert({_id: 0, a: 5, b: 5})&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;WriteResult({ &quot;nInserted&quot; : 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;&amp;gt; db.coll.insert({_id: 1, a: 5, b: 6})&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;WriteResult({ &quot;nInserted&quot; : 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;&amp;gt; db.coll.find({$expr: {$eq: [&quot;$a&quot;, &quot;$b&quot;]}})&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; { &quot;_id:&quot; : 0, &quot;a&quot; : 5, &quot;b&quot; : 5 }&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="1403828" author="jonathan-rezende" created="Sun, 9 Oct 2016 20:48:29 +0000"  >&lt;p&gt;weird, this seem to be something so simple. It would be very helpful with the validator option.&lt;/p&gt;</comment>
                            <comment id="78494" author="remonvv" created="Mon, 9 Jan 2012 10:03:52 +0000"  >&lt;p&gt;I don&apos;t think that&apos;ll work since that&apos;s would be rather ambiguous syntax. One wouldn&apos;t be able to perform an actual $gt on the string &quot;$b&quot; without some sort of escaping or other mechanism that allows special casing $-first strings. I haven&apos;t looked at the aggregation framework yet so I&apos;m not sure if that has similar issues. In any case, for this particular feature request I don&apos;t think the {$gt:&quot;$b&quot;} approach is preferable.&lt;/p&gt;

&lt;p&gt;EDIT: I&apos;ve reviewed the aggregation framework syntax and theoretically it suffers from the same problem although I can&apos;t see any direct issues so far since the expressions/pipeline operators where it would matter do not allow field references it seems (e.g. you can&apos;t {$match:{field1:&quot;$field2&quot;}} by the looks of it). Obviously having to compare with the string &quot;$field&quot; rather than the field &quot;field&quot; is an edge case but that can hardly be a valid argument in favor of the current syntax. Hoping that a user doesn&apos;t do something that should be possible isn&apos;t really a sound design philosophy.&lt;/p&gt;</comment>
                            <comment id="78455" author="pdxwebdev" created="Sun, 8 Jan 2012 23:29:48 +0000"  >&lt;p&gt;Personally, I like the direction we&apos;re going with the aggregation framework which would look more like this:&lt;/p&gt;

&lt;p&gt;db.test.find({a:{$gt:&quot;$b&quot;}})&lt;/p&gt;</comment>
                            <comment id="25589" author="remonvv" created="Wed, 9 Mar 2011 10:41:01 +0000"  >&lt;p&gt;By the way, the above example isn&apos;t valid JSON obviously so it would probably need an operator of some sort, e.g. : db.test.find({a:{$gt:{$field: &quot;b&quot;}}})&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="417922">SERVER-30731</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="14725">SERVER-2549</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="14613">SERVER-2507</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="14725">SERVER-2549</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="55986">SERVER-7623</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="235841">SERVER-21091</issuekey>
        </issuelink>
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