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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3337] $all with an empty array should return all documents rather than no documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-3337</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$all doesn&apos;t work as expected on lists&lt;/p&gt;

&lt;p&gt;The logic of all seems to be:&lt;br/&gt;
{field:{$all:lst}}&lt;br/&gt;
if for all x in list, x is in field, then return&lt;br/&gt;
else, do not return&lt;/p&gt;

&lt;p&gt;However, for the empty list, which would vacuously satisfy everything, it does not return everything.&lt;/p&gt;</description>
                <environment></environment>
        <key id="18719">SERVER-3337</key>
            <summary>$all with an empty array should return all documents rather than no documents</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nakamura">Moses Nakamura</reporter>
                        <labels>
                            <label>logic</label>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Sun, 26 Jun 2011 04:11:45 +0000</created>
                <updated>Tue, 6 Dec 2022 05:42:38 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4413871" author="asya" created="Tue, 15 Mar 2022 19:33:59 +0000"  >&lt;p&gt;Since &lt;tt&gt;$in:[]&lt;/tt&gt; returns nothing, I don&apos;t see how &lt;tt&gt;$all&lt;/tt&gt; can behave differently...&lt;/p&gt;</comment>
                            <comment id="2323693" author="david.storch" created="Fri, 12 Jul 2019 18:54:36 +0000"  >&lt;p&gt;The behavior of {$all: []} matching nothing has been in place for a long time, possibly since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-143&quot; title=&quot;$all : [] returns everything&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-143&quot;&gt;&lt;del&gt;SERVER-143&lt;/del&gt;&lt;/a&gt;. It would definitely be a breaking change, although this could be a valuable change to help improve the consistency of MQL and avoid special cases in the semantics of the language. Since this behavior has been purposefully preserved over time to avoid impacting applications, I&apos;m going to reclassify this ticket as &quot;Improvement&quot; rather than &quot;Bug&quot;.&lt;/p&gt;</comment>
                            <comment id="521295" author="jason.coombs@yougov.com" created="Sun, 23 Mar 2014 18:49:43 +0000"  >&lt;p&gt;I concur. Rather than raise an error, MongoDB should accept the empty list and treat it just like a list of empty queries.&lt;/p&gt;</comment>
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