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    <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-56233] Multi-key for wildcard indexes have special encoding that must be extended to clustered indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-56233</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Wildcard indexes may have many (an unbounded number of) multi-key paths, one multi-key path for every path to an array in any document.&lt;/p&gt;

&lt;p&gt;e.g. something like&lt;br/&gt;
{_id: &amp;lt;&amp;gt;, a: &lt;span class=&quot;error&quot;&gt;&amp;#91;40, 30&amp;#93;&lt;/span&gt;}             =&amp;gt; &quot;a&quot;     (multi-key path)&lt;br/&gt;
{_id: &amp;lt;&amp;gt;, a: {b: &lt;span class=&quot;error&quot;&gt;&amp;#91;40, 30&amp;#93;&lt;/span&gt;}}    =&amp;gt; &quot;a.b&quot;  (multi-key path)&lt;/p&gt;

&lt;p&gt;Rather than storing the multi-key path in the mdb catalog entry for the index, the multi-key paths for wildcard indexes are stored in the index table, as a KeyString. There is a reserved range of record IDs for multi-key paths, and a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/edfe720bfe35c186f7f3f31dbb541ccb1f449d0a/src/mongo/db/index/wildcard_key_generator.cpp#L236-L252&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;special RecordID constant&lt;/a&gt; is used in the KeyString (which is the &apos;key&apos; with the record ID appended at the end).&lt;/p&gt;

&lt;p&gt;However, clustered indexes use RecordID strings as opposed to int64 for regular indexes. There is an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/edfe720bfe35c186f7f3f31dbb541ccb1f449d0a/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp#L260-L272&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;expectation in the WiredTigerIndex layer such that an overall index has a KeyFormat of either string or int64&lt;/a&gt;, and it checks for that type. Therefore, we run into problems with a clustered wildcard index specially handling multi-key with an int64, and then the lower code layer expects a string.&lt;/p&gt;

&lt;p&gt;Furthermore, clustered indexes strings were designed to support many different types, wherein timestamps is just one among many. We need to figure out how to either reserve a safe range of RecordIDs for string RecordID multi-key path documents; or otherwise flag a KeyString as a wildcard multi-key path entry.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1685739">SERVER-56233</key>
            <summary>Multi-key for wildcard indexes have special encoding that must be extended to clustered indexes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Apr 2021 14:46:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:42 +0000</updated>
                            <resolved>Mon, 17 May 2021 15:20:16 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3772983" author="xgen-internal-githook" created="Thu, 13 May 2021 23:47:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56233&quot; title=&quot;Multi-key for wildcard indexes have special encoding that must be extended to clustered indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56233&quot;&gt;&lt;del&gt;SERVER-56233&lt;/del&gt;&lt;/a&gt; Support wildcard multikey paths on clustered collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72ed8227aa029afd554aa5809d36529ac145c3e8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72ed8227aa029afd554aa5809d36529ac145c3e8&lt;/a&gt;&lt;/p&gt;</comment>
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