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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-737] $allOrdered / $contains query operations for arrays</title>
                <link>https://jira.mongodb.org/browse/SERVER-737</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It could be helpful to provide a new operator, similar to $all for arrays, that matches an ordered subset of items:&lt;/p&gt;

&lt;p&gt;db.test.insert(&lt;/p&gt;
{&apos;actions&apos;: [2, 6, 3, 8, 5, 3]}
&lt;p&gt;);&lt;br/&gt;
db.test.insert(&lt;/p&gt;
{&apos;actions&apos;: [6, 4, 2, 8, 4, 3]}
&lt;p&gt;);&lt;br/&gt;
// This should find the first document, but not the second as only the first contains &lt;span class=&quot;error&quot;&gt;&amp;#91;6, 3, 8&amp;#93;&lt;/span&gt; in order&lt;br/&gt;
db.test.find({&apos;actions&apos;: {&apos;$contains&apos;: &lt;span class=&quot;error&quot;&gt;&amp;#91;6, 3, 8&amp;#93;&lt;/span&gt;}});&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4b993df679e2022d6d0086f3&quot;), &apos;actions&apos; : [2, 6, 3, 8, 5, 3] }

&lt;p&gt;A couple of use cases:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Phrase matching in full-text search (storing stemmed terms as strings in an array)&lt;/li&gt;
	&lt;li&gt;Finding users on a website that have performed a certain sequence of actions&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Also, allowing it to be optionally anchored to the start or end of an array would open up more possibilities:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Storing paths to files as individual segments of the path (by splitting the path by &apos;/&apos;), then finding files under a certain directory&lt;br/&gt;
(or more generically, querying on items that have a list that is a path in a tree/hierarchy or a graph).&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="11484">SERVER-737</key>
            <summary>$allOrdered / $contains query operations for arrays</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="hmarr">Harry Marr</reporter>
                        <labels>
                            <label>nc</label>
                    </labels>
                <created>Thu, 11 Mar 2010 14:07:07 +0000</created>
                <updated>Tue, 6 Dec 2022 05:50:23 +0000</updated>
                            <resolved>Fri, 28 Jan 2022 20:41:28 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1829226" author="asya" created="Fri, 9 Mar 2018 19:25:47 +0000"  >&lt;p&gt;There&apos;s a blog post explaining how the above works and showing how to do non-strict ordered subset match also: &lt;a href=&quot;http://www.kamsky.org/stupid-tricks-with-mongodb/how-to-match-a-strict-subset-of-an-array-in-order&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.kamsky.org/stupid-tricks-with-mongodb/how-to-match-a-strict-subset-of-an-array-in-order&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1610595" author="asya" created="Thu, 29 Jun 2017 16:43:31 +0000"  >&lt;p&gt;For the record, this is how:&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;db.test.aggregate([&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;   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;  {$match:{actions:{$all:[6,3,8]}}},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  {$addFields:{actions638:{$map:{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        input:{$range:[0,{$subtract:[{$size:&quot;$actions&quot;},2]}]},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        in:{$slice:[&quot;$actions&quot;,&quot;$$this&quot;,3]}&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;   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;
		&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;   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;  {$match:{actions638:[6,3,8]}}&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;])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1610582" author="asya" created="Thu, 29 Jun 2017 16:36:12 +0000"  >&lt;p&gt;This is possible to do in aggregation framework using array expressions, but that&apos;s only helpful if this use case is for analytics.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="11712">SERVER-974</issuekey>
        </issuelink>
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