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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-73589] Heuristic to auto-parameterize less for complex expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-73589</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The auto-parameterization code used for SBE and the SBE plan cache currently auto-parameterizes &lt;em&gt;all&lt;/em&gt; constants inside a match expression (at least for those types of expressions eligible for auto-parameterization). If the expression is complex, this means that it can end up with hundreds of parameters. Auto-parameterization is currently useful in combination with the SBE plan cache &amp;#8211; if we see the same query again but with different parameter values, we can use the cached plan rather than recompiling from scratch.&lt;/p&gt;

&lt;p&gt;However, we have seen evidence in our benchmarks that there is also a performance cost associated with auto-parameterization. The auto-parameterized plans have variable references to read values out of the &lt;tt&gt;RuntimeEnvironment&lt;/tt&gt; instead of inlined constants, and also the plans themselves might have to sometimes be more complex in order to ensure that they can work if arbitrary constants are bound-in.&lt;/p&gt;

&lt;p&gt;In this ticket, we should run some performance experiments in order to choose a good heuristic for when to avoid parameterizing. For instance, perhaps we can avoid parameterizing any constants inside an &lt;tt&gt;$and&lt;/tt&gt; or &lt;tt&gt;$or&lt;/tt&gt; if the number of branches exceeds some cutoff &amp;#8211; e.g. more than 20 or 50 branches. The exact numbers would hopefully be empirically derived.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2252221">SERVER-73589</key>
            <summary>Heuristic to auto-parameterize less for complex expressions</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="13201">Fixed</resolution>
                                        <assignee username="anna.wawrzyniak@mongodb.com">Anna Wawrzyniak</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>pm2697-m3</label>
                    </labels>
                <created>Fri, 3 Feb 2023 16:18:25 +0000</created>
                <updated>Sun, 29 Oct 2023 21:26:57 +0000</updated>
                            <resolved>Mon, 20 Mar 2023 16:22:43 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5281376" author="xgen-internal-githook" created="Fri, 17 Mar 2023 18:34:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Anna Wawrzyniak&apos;, &apos;email&apos;: &apos;anna.wawrzyniak@mongodb.com&apos;, &apos;username&apos;: &apos;anna-wawrzyniak&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73589&quot; title=&quot;Heuristic to auto-parameterize less for complex expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73589&quot;&gt;&lt;del&gt;SERVER-73589&lt;/del&gt;&lt;/a&gt; - Heuristic to auto-parameterize less for complex expressions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2972faf253242d5f9d0bb680dc317b58ca177ee8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2972faf253242d5f9d0bb680dc317b58ca177ee8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5247616" author="JIRAUSER1263795" created="Fri, 3 Mar 2023 17:57:08 +0000"  >&lt;p&gt;Perf test results:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;improvement&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_20.Crud.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1356664146&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1344089808.18&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0.94%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_20.find.ftdc&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;1343957283.24&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0.94%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_50.Crud.ftdc&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;2750054262.04&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.14%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_50.find.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2781270882&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2749878541.34&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.14%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_100.Crud.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5119319642&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5094107057.08&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0.49%&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_200.Crud.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;9795325994&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;9667996186.70&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.32%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_200.find.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;9794794332&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;9667552660.20&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.32%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_500.Crud.ftdc&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;23533307433.56&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.72%&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;1.72%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_1000.Crud.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;47198949313&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;46457608493.60&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.60%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_1000.find.ftdc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;47197404867&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;46455994235.02&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.60%&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;MatchOrWithManyChildClauses_5000.Crud.ftdc&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;229571594951.34&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;229564098185.10&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;13.07%&lt;/td&gt;
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&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;



&lt;p&gt;It seems like it makes sense to set a threshold around ~500-1000 to disable autoparameterization.&lt;br/&gt;
Will add a new query knob internalQueryAutoParameterizationMaxParameterCount that will disable autoparameterization if the number of generated parameters was to be larger than the limit.&lt;/p&gt;</comment>
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