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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-14353] Make MergeSortStage advance faster by not returning NEED_TIME for each key</title>
                <link>https://jira.mongodb.org/browse/SERVER-14353</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the merge sort implementation returns NEED_TIME every time that it retrieves a key from a child stage. See the code here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/exec/merge_sort.cpp#L72-L125&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/exec/merge_sort.cpp#L72-L125&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As a result, a merge sort plan is disadvantaged in plan ranking, as it could potentially advance more slowly than a plan with, say, a blocking sort stage. As an alternative, the MergeSortStage could retrieve multiple results from its children in one work() before returning NEED_TIME.&lt;/p&gt;</description>
                <environment></environment>
        <key id="143907">SERVER-14353</key>
            <summary>Make MergeSortStage advance faster by not returning NEED_TIME for each key</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
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                <created>Wed, 25 Jun 2014 14:13:25 +0000</created>
                <updated>Tue, 6 Dec 2022 05:04:28 +0000</updated>
                                            <version>2.6.3</version>
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