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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-15865] Remove batchSize from explain command shell helpers</title>
                <link>https://jira.mongodb.org/browse/SERVER-15865</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;BatchSize does not make sense in explain and we should just remove it from the helper.&lt;/p&gt;

&lt;p&gt;We should also consider rejecting explain commands with a batchSize.&lt;/p&gt;</description>
                <environment></environment>
        <key id="166233">SERVER-15865</key>
            <summary>Remove batchSize from explain command shell helpers</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Wed, 29 Oct 2014 20:52:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:59:26 +0000</updated>
                                            <version>2.7.8</version>
                                    <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="752022" author="rassi@10gen.com" created="Wed, 29 Oct 2014 22:02:07 +0000"  >&lt;p&gt;I see your point, though I think it&apos;s not necessarily bad to be able to show users that it doesn&apos;t have an effect on the explained query.  I think this is a side effect of the explain design: our current explain implementation (as documented, though I don&apos;t think it&apos;s ideal) runs through the entire result set and returns execution stats for the entire query, but perhaps in the future we can explain one batch at a time, and/or indicate in the command response how each of the options would change execution of the query (note also that presence of the exhaust flag, the &quot;no timeout&quot; flag, and the tailable flag also don&apos;t have any effect on the explained query, but explain accepts them still).&lt;/p&gt;</comment>
                            <comment id="752013" author="renctan" created="Wed, 29 Oct 2014 21:51:49 +0000"  >&lt;p&gt;It is misleading that you can set something that has no effect and that can be confusing to users.&lt;/p&gt;</comment>
                            <comment id="752003" author="rassi@10gen.com" created="Wed, 29 Oct 2014 21:44:25 +0000"  >&lt;p&gt;I disagree on both counts.  The legacy $explain path ignores batchSize, and I think that this is the correct design and that the explain command should follow suit (and I believe it&apos;s not necessary to make the shell and drivers conditionally include this field).  The same way that users today can tack a .explain() onto an existing call to db.collection.find(blah).blah().batchSize().blah() and see an explain of the same query, users of 2.8 should be able to use the same cursor methods against an &quot;explainable collection&quot; and see the explain for the same query.&lt;/p&gt;</comment>
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