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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-47664] Improved MatchExpression equivalence checking</title>
                <link>https://jira.mongodb.org/browse/SERVER-47664</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our current &lt;tt&gt;MatchExpression:equivalent&lt;/tt&gt; comparison is deficient in a number of ways. It intentionally performs a simple, direct comparison between trees that does not attempt to account for predicate order or other similar differences, but can fail to identify equivalent trees even in cases where both have been optimized and sorted. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47661&quot; title=&quot;Ensure consistent sort-order for MatchExpression trees&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47661&quot;&gt;SERVER-47661&lt;/a&gt; is intended to address the latter, but we should make further efforts to improvement &lt;tt&gt;MatchExpression&lt;/tt&gt; equivalence checking where possible.&lt;/p&gt;

&lt;p&gt;For instance, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/61f5d6cf5087d656ebc4bbd2bf75a0a5eacb9cad/src/mongo/db/matcher/expression_leaf.cpp#L67-L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;require that the collators of both trees match&lt;/a&gt; when checking the equivalence of comparison predicates, but then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/61f5d6cf5087d656ebc4bbd2bf75a0a5eacb9cad/src/mongo/db/matcher/expression_leaf.cpp#L71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;neglect to take collation into account&lt;/a&gt; when checking whether string predicates are equivalent. Under a case-insensitive collation, for example, a predicate {&lt;tt&gt;a:&quot;blah&quot;&lt;/tt&gt;} would match the same set of documents as {&lt;tt&gt;a:&quot;BLAH&quot;&lt;/tt&gt;}, and so these should be considered equivalent. Currently, however, the predicates are are always evaluated using simple binary comparison, and so these two predicates will always be considered different from each other.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1322941">SERVER-47664</key>
            <summary>Improved MatchExpression equivalence checking</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="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="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>qexec-team</label>
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                <created>Mon, 20 Apr 2020 15:59:23 +0000</created>
                <updated>Tue, 28 Nov 2023 13:01:21 +0000</updated>
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