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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-47659] Add &apos;wildcardProjection&apos; parameter to index signature</title>
                <link>https://jira.mongodb.org/browse/SERVER-47659</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At present, an index&apos;s signature - that is, the combination of parameters which uniquely identify the index - is defined by its keypattern and collation. No index can be created if its signature is equivalent to an existing index. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25023&quot; title=&quot;no way to index the same fields with two different partial index filters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25023&quot;&gt;&lt;del&gt;SERVER-25023&lt;/del&gt;&lt;/a&gt; seeks to add the &lt;tt&gt;partialFilterExpression&lt;/tt&gt; parameter to this list, such that multiple partial indexes could be built on the same fields so long as their filters are different.&lt;/p&gt;

&lt;p&gt;We should also add the &lt;tt&gt;wildcardProjection&lt;/tt&gt; parameter to the index signature. At present, we allow any number of wildcard indexes to be built using the {&lt;tt&gt;&quot;field.path.$**&quot;: 1&lt;/tt&gt;} notation, but we do not allow multiple wildcard indexes with different projections to exist. It is therefore legal to do 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;
		&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.coll.createIndex({&quot;a.$**&quot;: 1})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.createIndex({&quot;b.$**&quot;: 1})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;... but illegal to do the following, even though the indexes should be functionally identical to the above:&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.coll.createIndex({&quot;$**&quot;: 1}, {wildcardProjection: {a: 1}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.createIndex({&quot;$**&quot;: 1}, {wildcardProjection: {b: 1}})&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;More significantly, the former syntax is limited to inclusion of a single path; permitting the latter would be far more powerful in allowing the user to create separate wildcard indexes to index different sections of their dataset.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1322111">SERVER-47659</key>
            <summary>Add &apos;wildcardProjection&apos; parameter to index signature</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="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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Mon, 20 Apr 2020 14:59:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:16 +0000</updated>
                            <resolved>Mon, 19 Apr 2021 18:23:00 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3725759" author="xgen-internal-githook" created="Mon, 19 Apr 2021 18:07:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47659&quot; title=&quot;Add &amp;#39;wildcardProjection&amp;#39; parameter to index signature&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47659&quot;&gt;&lt;del&gt;SERVER-47659&lt;/del&gt;&lt;/a&gt; Added &apos;wildcardProjection&apos; index option to index signature&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c0dc70a2dfdfb52991ec7206e0007b6c6563d7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c0dc70a2dfdfb52991ec7206e0007b6c6563d7b&lt;/a&gt;&lt;/p&gt;</comment>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="1683001">DOCS-14369</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1963819">SERVER-62636</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2074325">SERVER-67446</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="300613">SERVER-25023</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1321726">SERVER-47657</issuekey>
        </issuelink>
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                            <customfieldvalue>The wildcardProjection index option is now part of the index signature test unlike v4.4. To achieve this behavior, we&amp;#39;re normalizing wildcardProjection option if it&amp;#39;s not empty before creating an {&amp;quot;$**&amp;quot;: 1} wildcard index.&lt;br/&gt;
&lt;br/&gt;
For example, {&amp;quot;$**&amp;quot;: 1} {wildcardProjection: {a: 1}} is normalized to {&amp;quot;$**&amp;quot;: 1} {wildcardProjection: {a: true, _id: false}}, which may be visibly different from what a user exactly specified.</customfieldvalue>

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