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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-37140] Investigate what other StageConstraints are &quot;inheritable&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-37140</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35419&quot; title=&quot;Make diskRequirement in StageConstraints in DocumentSource reflect child pipeline requirements.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35419&quot;&gt;&lt;del&gt;SERVER-35419&lt;/del&gt;&lt;/a&gt;, we&apos;re introducing a new helper that iterates over a pipeline of DocumentSources and &quot;resolves&quot; the strictest DiskUseRequirement and TransactionRequirement. This code is helpful for the $lookup and $facet stages, which have sub-pipelines of their own and &quot;inherit&quot; the strictest requirement of their children.&lt;/p&gt;

&lt;p&gt;This ticket is to investigate what other StageConstraints should be inherited, if any.  If there are more, we can genericize &lt;tt&gt;StageConstraints::resolveDiskUseAndTransactionRequirement()&lt;/tt&gt;&lt;br/&gt;
 to resolve all such constraints. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; thinks that FacetRequirement might be eligible. ChangeStreamRequirement looks like it &lt;em&gt;could&lt;/em&gt; be eligible, but the existence of &lt;tt&gt;kChangeStreamStage&lt;/tt&gt; makes it seem difficult.&lt;/p&gt;</description>
                <environment></environment>
        <key id="604921">SERVER-37140</key>
            <summary>Investigate what other StageConstraints are &quot;inheritable&quot;</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 14 Sep 2018 15:59:08 +0000</created>
                <updated>Tue, 6 Dec 2022 03:18:34 +0000</updated>
                            <resolved>Fri, 5 Oct 2018 15:22:35 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2025133" author="david.storch" created="Fri, 5 Oct 2018 15:22:35 +0000"  >&lt;p&gt;Closing per Charlie&apos;s comment above.&lt;/p&gt;</comment>
                            <comment id="2012743" author="charlie.swanson" created="Mon, 24 Sep 2018 21:16:45 +0000"  >&lt;p&gt;The code review for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35419&quot; title=&quot;Make diskRequirement in StageConstraints in DocumentSource reflect child pipeline requirements.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35419&quot;&gt;&lt;del&gt;SERVER-35419&lt;/del&gt;&lt;/a&gt; pointed out that it might make sense for stages with sub-pipelines to inherit their facet requirement from a sub-pipeline. This is actually an interesting question though. For example, if a facet allows a $lookup stage, should it only allow stages within the $lookup that might not otherwise be allowed within a facet? Some examples are $currentOp, $geoNear, $collStats. I actually can&apos;t recall whether these are allowed within a $lookup but I don&apos;t see any evidence that they are not. So I don&apos;t think we should make this change to &apos;inherit&apos; the facet requirement through a $lookup or another $facet (though the nested $facet case doesn&apos;t really matter as much since clearly a stage which cannot be in a $facet would get caught either way).&lt;/p&gt;

&lt;p&gt;The other constraints are: StreamType (streaming or blocking), Position Requirement (first, last, or none), HostTypeRequirement (5 choices), and ChangeStreamRequirement (whitelist, blacklist, or &apos;is a change stream stage&apos;). None of those really make sense to &apos;roll up&apos; to me either, so I&apos;d recommend closing this. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; agreed?&lt;/p&gt;</comment>
                            <comment id="2010448" author="david.storch" created="Fri, 21 Sep 2018 15:25:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; to elaborate on the potential impact of the constraints implementation as it exists today.&lt;/p&gt;</comment>
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