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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-27658] $or should choose SORT_MERGE instead of OR if all children provide the same sort</title>
                <link>https://jira.mongodb.org/browse/SERVER-27658</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We only choose a SORT_MERGE stage to combine or-clauses if there is a sort requested and all children can provide the sort. However, we could use a SORT_MERGE stage if all children provide the same sort, even if it is not the sort requested, or there is no sort requested. We look for a sort shared by all children &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.1/src/mongo/db/query/planner_access.cpp#L1089&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;This suggested improvement is assuming that a SORT_MERGE stage is always better than an OR stage in terms of performance or memory usage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="344965">SERVER-27658</key>
            <summary>$or should choose SORT_MERGE instead of OR if all children provide the same sort</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>neweng</label>
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                <created>Thu, 12 Jan 2017 16:36:44 +0000</created>
                <updated>Tue, 6 Dec 2022 04:08:12 +0000</updated>
                            <resolved>Tue, 24 Jan 2017 04:28:59 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="1483510" author="david.storch" created="Tue, 24 Jan 2017 04:28:59 +0000"  >&lt;p&gt;Closing as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24518&quot; title=&quot;MERGE_SORT_STAGE can be used more aggressively when OR_STAGE index sort orders match&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24518&quot;&gt;SERVER-24518&lt;/a&gt;.&lt;/p&gt;</comment>
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