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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>[DOCS-922] Finding Nodes By Partial Path</title>
                <link>https://jira.mongodb.org/browse/DOCS-922</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;FindNodesbyaPartialPath&quot;&gt;&lt;/a&gt;Find Nodes by a Partial Path&lt;/h3&gt;

&lt;p&gt;&lt;font color=&quot;#000000&quot;&gt;Suppose we want to find a given node in a tree, given some path through a portion of the tree to that node, and then get back that node, and perhaps also everything below it.&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;With a materialized paths approach we can do the above. The main thing that needs tweaking is to make the operation fast if there is a path &quot;a..b..c..d..e&quot; to a document and we want to find documents with a path &quot;..b..c..d..&quot;. If we are starting from the very top it is easy (and described above in the materialized paths section). However here we aren&apos;t starting at the top. One approach is to use a combination of materialized path plus an array of the node&apos;s ancestors, something like:&lt;/p&gt;

&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;   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;{ path : &quot;,a,b,c,d,e,&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;  ancestor : [&apos;a&apos;,&apos;b&apos;,&apos;c&apos;,&apos;d&apos;,&apos;e&apos;] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;We could index on ancestors which will create a &lt;span class=&quot;error&quot;&gt;&amp;#91;multikey|DOCS:Multikeys&amp;#93;&lt;/span&gt; index. Then we would do a query like the following to find nodes on path &quot;...b,c,d...&quot; with some efficiency:&lt;/p&gt;

&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;find({ path : /,b,c,d,/, ancestor : &apos;d&apos;, &amp;lt;more_query_expressions_optionally&amp;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;In the above the index on ancestor would be used and only docs from &apos;d&apos; down need be inspected. The following could be tried which might be even better depending on how smart the query optimizer is:&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;find( { path : /,b,c,d,/, ancestor : { $all : [&apos;a&apos;,&apos;d&apos;] }, ... } )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="60091">DOCS-922</key>
            <summary>Finding Nodes By Partial Path</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="sam.kleinman">Sam Kleinman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Dec 2012 01:14:16 +0000</created>
                <updated>Mon, 30 Oct 2023 21:57:56 +0000</updated>
                            <resolved>Wed, 27 Jul 2016 17:19:38 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1337910" author="emily.hall" created="Wed, 27 Jul 2016 17:19:38 +0000"  >&lt;p&gt;Closed by Emily Hall for Housekeeping on 7/27/16.&lt;br/&gt;
Please create a new ticket if for prioritization.&lt;/p&gt;

&lt;p&gt;Thank you!&lt;/p&gt;</comment>
                            <comment id="220870" author="samk" created="Fri, 21 Dec 2012 01:14:52 +0000"  >&lt;p&gt;Ephemera from the wiki that I don&apos;t think made it into the new guide. &lt;/p&gt;

&lt;p&gt;Feel free to close if I missed this?&lt;/p&gt;</comment>
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