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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>
    </build-info>


<item>
            <title>[SERVER-75079] Simplify boolean expressions before feeding them to the optimizer</title>
                <link>https://jira.mongodb.org/browse/SERVER-75079</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a part of a Skunkworks project we implemented a Boolean expression simplifier which demonstrated good results on some non-trivial Boolean expressions.&lt;/p&gt;

&lt;p&gt;For example,&lt;br/&gt;
given the following indexes: {d: 1, b: 1}, {a: 1}&lt;/p&gt;

&lt;p&gt;and the following query&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &apos;$and&apos;: [&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        {b: 0},&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            &apos;$or&apos;: [&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                {a: 0},&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                    &apos;$and&apos;: [&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        {c: {&apos;$in&apos;: [34, 45]}},&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            ]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        },&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    ]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;};&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;the optimizer chose a full collection scan plan.&lt;/p&gt;

&lt;p&gt;The boolean expression simplifier can simplify this filter just to the following one:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{a: 0, b: 0}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;given this filter the optimizer chose much more effective index scan on {a: 1} plan.&lt;/p&gt;

&lt;p&gt;The proposed in the Skunkworks project implementation does not depend on any optimizer and can be used for the classic one as well for the Bonsai. This ticket proposes to add the simplification for the classic optimizer. Then we can reuse the implementation of this ticket for the Bonsai: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74879&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-74879&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2293273">SERVER-75079</key>
            <summary>Simplify boolean expressions before feeding them to the optimizer</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="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="alexander.ignatyev@mongodb.com">Alexander Ignatyev</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
                            <label>query-product-scope-2</label>
                            <label>query-product-urgency-1</label>
                            <label>query-product-value-1</label>
                    </labels>
                <created>Tue, 21 Mar 2023 10:28:58 +0000</created>
                <updated>Tue, 19 Dec 2023 14:05:50 +0000</updated>
                            <resolved>Fri, 1 Dec 2023 09:23:45 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                                                            <comments>
                            <comment id="5563941" author="JIRAUSER1265607" created="Thu, 13 Jul 2023 15:09:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.ignatyev%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alexander.ignatyev@mongodb.com&quot;&gt;alexander.ignatyev@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="268052">SERVER-22857</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="439086">SERVER-31360</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                    <name>Issue split</name>
                                            <outwardlinks description="split to">
                                        <issuelink>
            <issuekey id="2455809">SERVER-81608</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2457154">SERVER-81788</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2457174">SERVER-81792</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2458917">SERVER-81846</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2458922">SERVER-81847</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2471675">SERVER-82076</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2477463">SERVER-82284</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2479781">SERVER-82350</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2335564">SERVER-76939</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2335565">SERVER-76940</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2346725">SERVER-77343</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2350236">SERVER-77470</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2355633">SERVER-77670</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2393490">SERVER-79018</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2400348">SERVER-79314</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2444600">SERVER-81139</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2456234">SERVER-81630</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2474052">SERVER-82176</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1887664">SERVER-60373</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2391482">SERVER-78962</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="544895">SERVER-35018</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="268052">SERVER-22857</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="439086">SERVER-31360</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2323798">SERVER-76509</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2288842">SERVER-74879</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                    </attachments>
                <subtasks>
                            <subtask id="2335560">SERVER-76938</subtask>
                    </subtasks>
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