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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-55639] $in with regex has special meaning</title>
                <link>https://jira.mongodb.org/browse/SERVER-55639</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a regex is inside an $in, the regex is actually evaluated against strings, acting like a regex match predicate rather than an equality predicate:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This means that $in is not simply syntactic sugar for an $or of equalities. Another unfortunate consequence is that the $lookup join predicate cannot always be expressed as an $in; if there is a regex it must be expressed as an $or.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1663274">SERVER-55639</key>
            <summary>$in with regex has special meaning</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="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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Mar 2021 15:40:43 +0000</created>
                <updated>Tue, 6 Dec 2022 01:28:02 +0000</updated>
                                                                            <component>Query Language</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1658264">SERVER-55509</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="147662">SERVER-14595</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="514146">SERVER-34012</issuekey>
        </issuelink>
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