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    <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-84728] Allow MatchExpression $or -&gt; $in rewrite to preserve parameters</title>
                <link>https://jira.mongodb.org/browse/SERVER-84728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84338&quot; title=&quot;Top level $or queries may lead to invalid SBE plan cache entry which returns wrong results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84338&quot;&gt;&lt;del&gt;SERVER-84338&lt;/del&gt;&lt;/a&gt; disabled the MatchExpression $or-&amp;gt;$in rewrite when the equality predicates are parameters. For example (in pseudo-MQL), {$or: [&lt;/p&gt;
{foo: p1}
&lt;p&gt;, {foo: p2}]} cannot be rewritten to {foo: {$in: &lt;span class=&quot;error&quot;&gt;&amp;#91;p1, p2&amp;#93;&lt;/span&gt;}} because InMatchExpression only allows the entire $in operand to be a single parameter. This fixed an edge case in the subplanner which resulted in construction of a residual predicate with incorrect autoparameterization behavior.&lt;/p&gt;

&lt;p&gt;Another solution to that problem is to introduce a new MatchExpression or modify the representation of InMatchExpression parameters in order to allow an InMatchExpression to contain an array of parameters and literals.&lt;/p&gt;

&lt;p&gt;Some questions we&apos;d need to answer to do this ticket:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Is the subplanner case in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84338&quot; title=&quot;Top level $or queries may lead to invalid SBE plan cache entry which returns wrong results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84338&quot;&gt;&lt;del&gt;SERVER-84338&lt;/del&gt;&lt;/a&gt; the only one where an array of parameters in $in would occur?&lt;/li&gt;
	&lt;li&gt;If so, is the complexity added by implementing this ticket worth the potential performance gain?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2542200">SERVER-84728</key>
            <summary>Allow MatchExpression $or -&gt; $in rewrite to preserve parameters</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="11262" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Investigating</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Jan 2024 16:12:58 +0000</created>
                <updated>Fri, 2 Feb 2024 23:22:38 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
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