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    <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-14784] Add expression indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-14784</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An expression index is one where the value being indexed is the result of an expression, like lower casing a string.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://en.wikipedia.org/wiki/Expression_index&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://en.wikipedia.org/wiki/Expression_index&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://www.postgresql.org/docs/8.1/static/indexes-expressional.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.postgresql.org/docs/8.1/static/indexes-expressional.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;One possible way of specifying the expression could be through the existing aggregation expressions: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/aggregation/#arithmetic-operators&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/operator/aggregation/#arithmetic-operators&lt;/a&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;
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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-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.addIndex(&quot;lowercase_name&quot;, {$expression: {$toLower:&quot;$name&quot;}});&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&lt;b&gt;Note&lt;/b&gt;: In the example above there is no name for the expression, aside from the index name, because any name could conflict with documents. Also, the expression should be used in the query; the query expression may be a sub/superset of the index expression, or multiple indexes.&lt;/p&gt;

&lt;p&gt;Any expression support in indexes requires those expressions be available in the query language as well; it could look like this:&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;
						&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({$expression: {$eq:[&quot;scott&quot;, {$toLower:&quot;$name&quot;}]}})&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="150786">SERVER-14784</key>
            <summary>Add expression indexes</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>product-priority</label>
                    </labels>
                <created>Mon, 4 Aug 2014 19:31:07 +0000</created>
                <updated>Mon, 5 Dec 2022 20:31:50 +0000</updated>
                                                                            <component>Index Maintenance</component>
                                        <votes>18</votes>
                                    <watches>42</watches>
                                                                                                                <comments>
                            <comment id="4958042" author="JIRAUSER1271732" created="Sun, 6 Nov 2022 23:59:07 +0000"  >&lt;p&gt;It would be even more helpful if the value of the expression cold be added as user_named document field - like a stored virtual field in MySQl&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="10294">SERVER-153</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="18266">SERVER-3260</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="10196">SERVER-90</issuekey>
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