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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-12845] Warn about old indexes for the &quot;Array Sort Behavior&quot; change in 3.6 compatibility notes</title>
                <link>https://jira.mongodb.org/browse/DOCS-12845</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;The &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.6-compatibility/#array-sort-behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;&lt;em&gt;Array Sort Behavior&lt;/em&gt;&quot; section of the 3.6 compatibility notes&lt;/a&gt; discuss the change implemented via &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19402&quot; title=&quot;Change semantics of sorting by array fields in find and aggregate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19402&quot;&gt;&lt;del&gt;SERVER-19402&lt;/del&gt;&lt;/a&gt;.&#160; There is a nice &quot;IMPORTANT&quot; note that mentions the potential performance degradation associated with this change when sorting on an array field.&lt;/p&gt;

&lt;p&gt;It is also possible to encounter the degraded performance even if you are not sorting on the array field itself.&#160; This occurs when the multikey index was built on version &lt;tt&gt;3.2&lt;/tt&gt; or earlier and has not been rebuilt since upgrading to &lt;tt&gt;3.4&lt;/tt&gt; which introduced &lt;tt&gt;multiKeyPaths&lt;/tt&gt; metadata.&#160; Without this metadata the optimizer only knows that &lt;em&gt;some&lt;/em&gt; indexed field is an array, but not which one specifically.&#160; As a result it must use the conservative behavior and generate a blocking sort to ensure correctness.&#160;&#160;&lt;/p&gt;

&lt;p&gt;Consider noting this caveat in the documentation as it is presently not clear what the problem is or what the fix is if a user were to encounter this situation.&#160; &#160;&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

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                <environment></environment>
        <key id="830279">DOCS-12845</key>
            <summary>Warn about old indexes for the &quot;Array Sort Behavior&quot; change in 3.6 compatibility notes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
                            <label>reopened</label>
                    </labels>
                <created>Mon, 1 Jul 2019 21:13:04 +0000</created>
                <updated>Mon, 30 Oct 2023 19:33:33 +0000</updated>
                            <resolved>Thu, 27 Oct 2022 16:58:49 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4932843" author="JIRAUSER1270801" created="Thu, 27 Oct 2022 16:58:49 +0000"  >&lt;p&gt;Product version no longer supported&lt;/p&gt;</comment>
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