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    <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-16051] Exec stages do not need to call documentNeedsFetch() for non-yielding plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-16051</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there are four stages which ask the storage engine whether a document is likely in memory, and if not request a yield by returning NEED_FETCH:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;CollectionScan&lt;/li&gt;
	&lt;li&gt;IDHackStage&lt;/li&gt;
	&lt;li&gt;FetchStage&lt;/li&gt;
	&lt;li&gt;MultiIteratorStage&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;These stages have no knowledge of the plan&apos;s yield policy, and must call &lt;tt&gt;documentNeedsFetch()&lt;/tt&gt; even for plans that will never yield. Any NEED_FETCH requests from these stages for a non-yielding plan will simply be ignored. We can avoid this overhead by passing a flag to any stage which might return NEED_FETCH, and ensure that the stage only can request a yield when the flag is set.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168243">SERVER-16051</key>
            <summary>Exec stages do not need to call documentNeedsFetch() for non-yielding plans</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Nov 2014 17:20:29 +0000</created>
                <updated>Wed, 21 Oct 2015 16:26:18 +0000</updated>
                            <resolved>Wed, 21 Oct 2015 16:26:18 +0000</resolved>
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            <issuekey id="162266">SERVER-15541</issuekey>
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