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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-35673] MatchExpression tree should keep track of the full path to each leaf node</title>
                <link>https://jira.mongodb.org/browse/SERVER-35673</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now a leaf node will have the &quot;local&quot; path, but not the full context. For example, in both of the following queries there will be an equality node with the path &quot;foo&quot;:&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;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;{foo: 4}&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;   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: {$elemMatch: {foo: 4}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In the second query, the full path for that equality is really &quot;a.foo&quot;. As a result, a lot of planning logic has to manually keep track of the full path to accomodate this. For example &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4c77f4f5a72a27ac98557de49b74eb1a019dd196/src/mongo/db/query/planner_ixselect.cpp#L154-L162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this logic in &lt;tt&gt;QueryPlannerIXSelect::getFields()&lt;/tt&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="561588">SERVER-35673</key>
            <summary>MatchExpression tree should keep track of the full path to each leaf node</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="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="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                            <label>storch</label>
                    </labels>
                <created>Tue, 19 Jun 2018 17:51:52 +0000</created>
                <updated>Tue, 6 Dec 2022 03:26:12 +0000</updated>
                                                                            <component>Internal Code</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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