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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85436] ABT Constant value pooling for efficient copying</title>
                <link>https://jira.mongodb.org/browse/SERVER-85436</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As uncovered by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80576&quot; title=&quot;Microbenchmarks - investigate regression in $in queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80576&quot;&gt;SERVER-80576&lt;/a&gt;, nearly 40% of the optimization time of large $in queries is spent in copying the constant array argument of $in. This copying happens because of the ABT and Cascades designs that require ABT (sub)-trees to be copied when they are processed somehow.&lt;/p&gt;

&lt;p&gt;One way to speed up such copies when an ABT query representation references large Constant objects is to avoid copying the Value that is contained inside the Constant.&lt;/p&gt;

&lt;p&gt;The idea is that when a Constant is created to hold a new Value, the Value is stored in a constant pool, and then each subsequent invocation of Constant&apos;s copy constructor creates a new Constant that references the original Value.&lt;/p&gt;

&lt;p&gt;This approach will likely benefit only large enough values such as strings and arrays.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2550992">SERVER-85436</key>
            <summary>ABT Constant value pooling for efficient copying</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="timour.katchaounov@mongodb.com">Timour Katchaounov</reporter>
                        <labels>
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                <created>Fri, 19 Jan 2024 09:00:41 +0000</created>
                <updated>Wed, 31 Jan 2024 13:50:09 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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                            <comment id="6055022" author="JIRAUSER1258247" created="Wed, 31 Jan 2024 08:38:36 +0000"  >&lt;p&gt;Given that work on Bonsai is paused, stopping progress on this ticket. Two alternative implementations are attached to the ticket. Both implementations result in nearly double performance improvement (based on Bonsai without SargableNode) - from 334 to 606 qps. With this improvement Bonsai is within 5% from Classic/SBE.&lt;/p&gt;</comment>
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                            <attachment id="507864" name="s-85436-const-cache.v1.diff" size="3033" author="timour.katchaounov@mongodb.com" created="Tue, 30 Jan 2024 12:39:15 +0000"/>
                            <attachment id="507865" name="s-85436-ref-counted-val.v1.diff" size="6543" author="timour.katchaounov@mongodb.com" created="Tue, 30 Jan 2024 12:39:21 +0000"/>
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