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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-55186] Experiment with binary search in $in SBE implementation</title>
                <link>https://jira.mongodb.org/browse/SERVER-55186</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Classic engine uses binary search to check if equalities specified in &lt;tt&gt;$in&lt;/tt&gt; match expression contain given BSON element. Equalities are stored as a vector of deduplicated and sorted BSON elements (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d22d0058c4f02c7bcd7337af8b1058cac8e26e45/src/mongo/db/matcher/expression_leaf.h#L641-L647&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_equalitySet&lt;/a&gt; field of &lt;tt&gt;InMatchExpression&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;SBE uses &lt;tt&gt;ArraySet&lt;/tt&gt; (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d22d0058c4f02c7bcd7337af8b1058cac8e26e45/src/mongo/db/query/sbe_stage_builder_filter.cpp#L1330-L1333&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;corresponding builder&lt;/a&gt;) to construct equalities set, ignoring the fact that equalities are deduplicated and sorted.&lt;/p&gt;

&lt;p&gt;We should try to experiment with binary search implementation in SBE. This can potentially be beneficial since we do not need to spend time constructing &lt;tt&gt;ArraySet&lt;/tt&gt; and we use the pre-processing of equalities set performed in &lt;tt&gt;InMatchExpression&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1648866">SERVER-55186</key>
            <summary>Experiment with binary search in $in SBE implementation</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="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Mon, 15 Mar 2021 13:26:10 +0000</created>
                <updated>Tue, 6 Dec 2022 01:31:08 +0000</updated>
                                                                                                <votes>0</votes>
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