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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-78635] [CQF] Refactor PartialSchemaReqConverter to avoid quadratic behavior</title>
                <link>https://jira.mongodb.org/browse/SERVER-78635</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a few operations in PartialSchemaReqConverter that are unnecessarily quadratic on the number of PSR entries.&lt;/p&gt;

&lt;p&gt;#1&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/utils/utils.cpp#L940-L967&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This loop&lt;/a&gt; in intersectPartialSchemaReq iterates through every entry in the PSR DNF, looking for an existing requirement that meets the condition newKey.projectionName == existingReq.boundProjectionName. Instead of searching through the entire structure, PSR can hold a map of Requirement Bound Projection -&amp;gt; Atom Node::reference_type&lt;/p&gt;

&lt;p&gt;#2&lt;br/&gt;
Every time we call &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/utils/utils.cpp#L974&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;add&lt;/a&gt; in intersectPartialSchemaReq, the PSR &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/partial_schema_requirements.cpp#L185&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;renormalizes&lt;/a&gt;, which involves &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/partial_schema_requirements.cpp#L68-L78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resorting and deduplicating&lt;/a&gt; the entire structure. We could either normalize after converting to PSR, or insert into the structure in a way that keeps it in a normalized state. If the PSR is normalized later on in optimization, we could avoid normalizing altogether.&lt;/p&gt;

&lt;p&gt;These are the first solutions I thought of, it&apos;s possible a larger refactor might be more ideal.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2382851">SERVER-78635</key>
            <summary>[CQF] Refactor PartialSchemaReqConverter to avoid quadratic behavior</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>M9</label>
                    </labels>
                <created>Mon, 3 Jul 2023 18:49:12 +0000</created>
                <updated>Fri, 6 Oct 2023 17:44:42 +0000</updated>
                            <resolved>Tue, 3 Oct 2023 08:56:50 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
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            <issuekey id="2434149">SERVER-80735</issuekey>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="1961583">SERVER-62509</issuekey>
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            <issuelink>
            <issuekey id="2457868">SERVER-81822</issuekey>
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