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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-68274] [SBE] Missing query results when comparing field to Min/MaxKey and field is missing from document</title>
                <link>https://jira.mongodb.org/browse/SERVER-68274</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider the following example running the classic engine:&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.c.insert({b: &lt;/span&gt;&lt;span style=&quot;color: #009900; 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;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;})&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.c.find({a: {$gt: MinKey()}})&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;{b: &lt;/span&gt;&lt;span style=&quot;color: #009900; 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;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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Because the `a` field is missing in the document, it is implicitly `null` for the purposes of evaluating `a &amp;gt; MinKey()`. Because of BSON ordering semantics, `null` is greater than `MinKey()`, and results in the document being matched.&lt;/p&gt;

&lt;p&gt;When SBE (featureFlagSbeFull) is enabled, the server incorrectly omits this document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2098613">SERVER-68274</key>
            <summary>[SBE] Missing query results when comparing field to Min/MaxKey and field is missing from document</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                            <label>mql-semantics</label>
                            <label>sbe</label>
                    </labels>
                <created>Mon, 25 Jul 2022 19:00:48 +0000</created>
                <updated>Mon, 5 Dec 2022 23:54:34 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4866862" author="kyle.suarez" created="Thu, 29 Sep 2022 20:49:50 +0000"  >&lt;p&gt;I spoke to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris@mongodb.com&quot;&gt;christopher.harris@mongodb.com&lt;/a&gt; about this today:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;In most cases, we don&apos;t &lt;b&gt;really&lt;/b&gt; care about MinKey being used in queries. That being said, some TSEs make a recommendation to customers to &quot;compare field x to MinKey&quot; to force the use of a particular index, so it&apos;s not like there&apos;s &lt;em&gt;zero&lt;/em&gt; risk here.&lt;/li&gt;
	&lt;li&gt;Ultimately, neither of us feel the need to action on this now &lt;b&gt;unless&lt;/b&gt; the answer to this (either changing classic to match SBE or the other way around) somehow blocks a major architectural decision in either SBE, Bonsai or the broader CQF effort.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Based on the decision to not prioritize this ticket; I&apos;m sending it back to the backlog, but marking it with the &lt;tt&gt;mql-semantics&lt;/tt&gt; label to start tracking these &quot;weird MQL behavior&quot; tickets in one place.&lt;/p&gt;</comment>
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