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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-77733] [CQF] Simplify PathArr paths based on Multikeyness info</title>
                <link>https://jira.mongodb.org/browse/SERVER-77733</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider a filter expression such as Get &quot;a&quot; Arr. If &quot;a&quot; is never multikey this expression can never be true.&lt;/p&gt;

&lt;p&gt;The task is to extend the logical rewrite which transforms a filter expression to do the above.&lt;/p&gt;

&lt;p&gt;Specifically:&lt;/p&gt;

&lt;p&gt;Given a collection &lt;em&gt;coll&lt;/em&gt; with &lt;em&gt;{&lt;/em&gt;id, x}{&lt;em&gt;} where x is a scalar field (i.e., no arrays) and an index on field {&lt;/em&gt;}x{_}.&lt;/p&gt;

&lt;p&gt;query:&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;
		&lt;tbody &gt;
				&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-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;db.coll.find({x : { $elemMatch: {$eq: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;5&lt;/span&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;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;successfully recognizes that x is a scalar field and simplifies the expression to return nothing without scanning the collection.&lt;/p&gt;

&lt;p&gt;On the other hand,&lt;/p&gt;

&lt;p&gt;query:&#160;&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;
		&lt;tbody &gt;
				&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-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;db.coll.find({x : { $elemMatch:{y: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;5&lt;/span&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;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;which assumes a subfield &lt;em&gt;y&lt;/em&gt; in &lt;em&gt;x&lt;/em&gt; despite &lt;em&gt;x&lt;/em&gt; being scalar and not having a &lt;em&gt;y&lt;/em&gt; subfield, the query actually scans the whole collection. We observe the same behavior even when we have an index on &lt;em&gt;x.y&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;The ticket aims to alleviate this behavior and allow recognizing this opportunity for optimization.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2356990">SERVER-77733</key>
            <summary>[CQF] Simplify PathArr paths based on Multikeyness info</summary>
                <type id="5" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14716&amp;avatarType=issuetype">Sub-task</type>
                            <parent id="2202862">SERVER-71871</parent>
                                    <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="matt.olma@mongodb.com">Matt Olma</assignee>
                                    <reporter username="svilen.mihaylov@mongodb.com">Svilen Mihaylov</reporter>
                        <labels>
                            <label>bonsai-onboarding</label>
                    </labels>
                <created>Fri, 2 Jun 2023 14:25:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:33 +0000</updated>
                            <resolved>Thu, 3 Aug 2023 13:22:30 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5609208" author="xgen-internal-githook" created="Thu, 3 Aug 2023 01:06:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Matt Olma&apos;, &apos;email&apos;: &apos;matt.olma@mongodb.com&apos;, &apos;username&apos;: &apos;mattsimply&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77733&quot; title=&quot;[CQF] Simplify PathArr paths based on Multikeyness info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77733&quot;&gt;&lt;del&gt;SERVER-77733&lt;/del&gt;&lt;/a&gt; Simplify PathArr paths based on Multikeyness info&lt;br/&gt;
Branch: minh.luu-no_compile_sys-perf&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a92008357157641aadbeb768720e0d148feca865&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a92008357157641aadbeb768720e0d148feca865&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5607225" author="xgen-internal-githook" created="Wed, 2 Aug 2023 12:42:43 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Matt Olma&apos;, &apos;email&apos;: &apos;matt.olma@mongodb.com&apos;, &apos;username&apos;: &apos;mattsimply&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77733&quot; title=&quot;[CQF] Simplify PathArr paths based on Multikeyness info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77733&quot;&gt;&lt;del&gt;SERVER-77733&lt;/del&gt;&lt;/a&gt; Simplify PathArr paths based on Multikeyness info&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a92008357157641aadbeb768720e0d148feca865&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a92008357157641aadbeb768720e0d148feca865&lt;/a&gt;&lt;/p&gt;</comment>
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