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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42090] Make ordering of OR branches stable in query data access planning</title>
                <link>https://jira.mongodb.org/browse/SERVER-42090</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ordering of the branches in an OR stage should not affect the performance of the plan, since all branches must be executed in full in order for the plan to complete. However, the order of the children can matter for plan selection, e.g. for users who are affected by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20616&quot; title=&quot;Plan ranker sampling from the beginning of a query&amp;#39;s execution can result in poor plan selection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20616&quot;&gt;SERVER-20616&lt;/a&gt;. The ordering chosen by the access planner is not only arbitrary right now, but it is not stable. That is, multiple executions of the same query could theoretically choose a different OR ordering. The improvement tracked by this ticket is to ensure that the planner always chooses a particular, if arbitrary, ordering.&lt;/p&gt;

&lt;p&gt;The ordering chosen right now is a function of the sort by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/daceefe370a71036df6e1ecb209e966d29bc2871/src/mongo/db/query/index_tag.cpp#L46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;TagComparison&lt;/tt&gt;&lt;/a&gt; done in preparation for access planning. The problem is that two very different MatchExpression nodes can easily sort equally under this comparison. In particular, &lt;tt&gt;$and&lt;/tt&gt; MatchExpression nodes can sort equally. To fix this, we can refine the comparator function to consider two nodes&apos; children if they would otherwise be considered equal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="835819">SERVER-42090</key>
            <summary>Make ordering of OR branches stable in query data access planning</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Jul 2019 13:03:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:17 +0000</updated>
                            <resolved>Wed, 4 Sep 2019 21:48:17 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2407991" author="xgen-internal-githook" created="Wed, 4 Sep 2019 21:28:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dstorch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;name&apos;: &apos;David Storch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42090&quot; title=&quot;Make ordering of OR branches stable in query data access planning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42090&quot;&gt;&lt;del&gt;SERVER-42090&lt;/del&gt;&lt;/a&gt; Ensure query planner produces a stable ordering of OR branches.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bac2b16a61498a65cbd61da0e15235363e7e77b9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bac2b16a61498a65cbd61da0e15235363e7e77b9&lt;/a&gt;&lt;/p&gt;</comment>
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