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    <title>MongoDB Jira</title>
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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-84850] Prototype partial pushdown from DocumentSource to PlanStage</title>
                <link>https://jira.mongodb.org/browse/SERVER-84850</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="887819">SERVER-84850</key>
            <summary>Prototype partial pushdown from DocumentSource to PlanStage</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="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="13201">Fixed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Aug 2019 17:43:42 +0000</created>
                <updated>Fri, 12 Jan 2024 02:51:43 +0000</updated>
                            <resolved>Thu, 15 Aug 2019 18:20:07 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="2373940" author="david.storch" created="Thu, 15 Aug 2019 18:20:07 +0000"  >&lt;p&gt;I&apos;ve completed this POC in patches 4 and 5 of &lt;a href=&quot;https://mongodbcr.appspot.com/504440019/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/504440019/&lt;/a&gt;. The issues at play here are as follows:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Should we introduce something like &lt;tt&gt;PipelineAstNode&lt;/tt&gt;? It&apos;s helpful to distinguish these nodes from query solution nodes, but in the short term they will get immediately transformed to &lt;tt&gt;QuerySolutionNode}}s, and then will get transformed from there to {{PlanStage&lt;/tt&gt; nodes. Do we need this many node types right now? Or can we get away with just &lt;tt&gt;QuerySolutionNode&lt;/tt&gt; and &lt;tt&gt;PlanStage&lt;/tt&gt; for now?&lt;/li&gt;
	&lt;li&gt;This change results in non-trivial pieces of the execution tree above the &lt;tt&gt;MultiPlanStage&lt;/tt&gt;. This will likely necessitate changes to the explain format, unless we want to bend over backwards to preserve the existing format (which I would be very hesitant to do). Patch 5 of the linked code review demonstrates a simple path forward, which will also help to expose execution stats from any agg stages that get pushed down into the &lt;tt&gt;PlanStage&lt;/tt&gt; execution tree.&lt;/li&gt;
	&lt;li&gt;We&apos;ll have to be careful to make sure that we don&apos;t break the path for planning from the cache.&lt;/li&gt;
	&lt;li&gt;Planning logic which is built into the &lt;tt&gt;getExecutor()&lt;/tt&gt; layer will probably have to be moved down a layer into the &lt;tt&gt;QueryPlanner&lt;/tt&gt; itself. I suspect that the POC doesn&apos;t correctly handle subplanning, logic for generating &lt;tt&gt;COUNT_SCAN&lt;/tt&gt; plans, or logic for generating &lt;tt&gt;DISTINCT_SCAN&lt;/tt&gt; plans.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;After patch 5 we can completely eliminate document source execution for pipelines with &lt;tt&gt;$unwind&lt;/tt&gt;, and we can report on what&apos;s going on in explain!&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pawel.terlecki&quot; class=&quot;user-hover&quot; rel=&quot;pawel.terlecki&quot;&gt;pawel.terlecki&lt;/a&gt;&lt;/p&gt;</comment>
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