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    <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-50291] Add query knob to enumerate $or children in a different order</title>
                <link>https://jira.mongodb.org/browse/SERVER-50291</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36393&quot; title=&quot;Contained $or pushdown optimization can cause internalQueryEnumerationMaxOrSolutions to be exceeded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36393&quot;&gt;SERVER-36393&lt;/a&gt; there are cases where we fail to enumerate some interesting plans because we limit the number of plans we generate for a contained $or. While not a complete solution, one suggestion for a workaround on that ticket was to add a way to enumerate the children of the $or in a different &quot;more interesting&quot; order. To quote:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Asya points out that our plan enumeration code might fall over like this less if it changes its enumeration strategy from something like:&lt;br/&gt;
A, A, A&lt;br/&gt;
A, A, B&lt;br/&gt;
A, A, C&lt;br/&gt;
...&lt;br/&gt;
To something like&lt;br/&gt;
A, A, A&lt;br/&gt;
B, B, B&lt;br/&gt;
C, C, C&lt;br/&gt;
...&lt;br/&gt;
This is a heuristic that might help us to force the plan selection code to consider the best index in more cases, short of a more complete solution.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This ticket tracks the work to implement that solution.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1440948">SERVER-50291</key>
            <summary>Add query knob to enumerate $or children in a different order</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="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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Aug 2020 14:17:28 +0000</created>
                <updated>Thu, 9 Nov 2023 23:32:47 +0000</updated>
                            <resolved>Wed, 2 Sep 2020 19:18:01 +0000</resolved>
                                    <version>3.6.6</version>
                    <version>4.0.0</version>
                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.2.10</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                    <fixVersion>4.0.21</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3374216" author="james.wahlin@10gen.com" created="Thu, 3 Sep 2020 14:01:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;&#160;- this looks OK to backport. I agree that with the feature flag off the risk of introducing is minimal.&lt;/p&gt;</comment>
                            <comment id="3373098" author="charlie.swanson" created="Wed, 2 Sep 2020 19:34:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt; can you take a look at the patch and let me know if you agree it is safe to backport? It&apos;s a lot of code for sure, but I think it&apos;s not too risky since it&apos;s all under a flag and the patch doesn&apos;t change much of the existing code.&lt;/p&gt;</comment>
                            <comment id="3373056" author="charlie.swanson" created="Wed, 2 Sep 2020 19:14:15 +0000"  >&lt;p&gt;Accidentally committed this under the wrong ticket. Copying githook comment here.&lt;/p&gt;

&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36393&quot; title=&quot;Contained $or pushdown optimization can cause internalQueryEnumerationMaxOrSolutions to be exceeded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36393&quot;&gt;SERVER-36393&lt;/a&gt; Add new opt-in $or enumeration order&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bffdd28e183d5b720c897b56278821e65762ccd7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bffdd28e183d5b720c897b56278821e65762ccd7&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2495984">SERVER-83091</issuekey>
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            <issuekey id="580891">SERVER-36393</issuekey>
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