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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-22400] Extend BtreeKeyGenerator::getKeys() to return which indexed paths are multikey</title>
                <link>https://jira.mongodb.org/browse/SERVER-22400</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A prefix of a non-positional indexed field will now be said to cause the index to be multikey as a result of inserting the generated keys only if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.3/src/mongo/db/index/btree_key_generator.cpp#L374-L387&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the &lt;tt&gt;arrElt&lt;/tt&gt; array value contained multiple elements&lt;/a&gt;. This change in the definition of multikey is aligned with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5580&quot; title=&quot;covered indexes are improperly applied when arrays do not have multiple values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5580&quot;&gt;&lt;del&gt;SERVER-5580&lt;/del&gt;&lt;/a&gt; and will only become user-facing after the changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22726&quot; title=&quot;Extend the KVCatalog to store path-level multikeyness info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22726&quot;&gt;&lt;del&gt;SERVER-22726&lt;/del&gt;&lt;/a&gt;. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22726&quot; title=&quot;Extend the KVCatalog to store path-level multikeyness info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22726&quot;&gt;&lt;del&gt;SERVER-22726&lt;/del&gt;&lt;/a&gt; will cause a regular ascending/descending index to be set as multikey (in &lt;tt&gt;IndexAccessMethod&lt;/tt&gt;) based on whether any set in the returned &lt;tt&gt;MultikeyPaths&lt;/tt&gt; is nonempty.&lt;/p&gt;

&lt;p/&gt;
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					&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;&#8658; Multikey paths: []&lt;/span&gt;&lt;/pre&gt;
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					&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;&#8658; Multikey paths: [&quot;a&quot;]&lt;/span&gt;&lt;/pre&gt;
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					&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;&#8658; Multikey paths: [&quot;a&quot;]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Note: the creation of v0 indexes has been disallowed since 3.1.9 (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17425&quot; title=&quot;Disallow creation of v0 indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17425&quot;&gt;&lt;del&gt;SERVER-17425&lt;/del&gt;&lt;/a&gt;), so only &lt;tt&gt;BtreeKeyGeneratorV1::getKeysImpl()&lt;/tt&gt; needs to be updated to return the prefixes of the indexed fields that cause the index to be multikey as a result of inserting the generated keys.&lt;/p&gt;</description>
                <environment></environment>
        <key id="262194">SERVER-22400</key>
            <summary>Extend BtreeKeyGenerator::getKeys() to return which indexed paths are multikey</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="9">Done</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Feb 2016 16:17:31 +0000</created>
                <updated>Thu, 14 Apr 2016 15:29:46 +0000</updated>
                            <resolved>Thu, 17 Mar 2016 14:24:50 +0000</resolved>
                                                    <fixVersion>3.3.4</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1206605" author="xgen-internal-githook" created="Thu, 17 Mar 2016 14:01:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visemet&apos;, u&apos;name&apos;: u&apos;Max Hirschhorn&apos;, u&apos;email&apos;: u&apos;max.hirschhorn@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22400&quot; title=&quot;Extend BtreeKeyGenerator::getKeys() to return which indexed paths are multikey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22400&quot;&gt;&lt;del&gt;SERVER-22400&lt;/del&gt;&lt;/a&gt; Compute multikey paths in BtreeKeyGeneratorV1::getKeys().&lt;/p&gt;

&lt;p&gt;Propagates information about the prefixes of the indexed fields that&lt;br/&gt;
cause the index to be multikey as a result of inserting the generated&lt;br/&gt;
keys.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0654b0f626fd4a2f1f8842fa41a98704aada6e01&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0654b0f626fd4a2f1f8842fa41a98704aada6e01&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="36049">SERVER-5580</issuekey>
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