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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-60484] Optimize field paths more generally</title>
                <link>https://jira.mongodb.org/browse/SERVER-60484</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We can introduce a slot id to &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt;. If &lt;tt&gt;generateExpression&lt;/tt&gt; find &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt; have a known slot id, it just generates a &lt;tt&gt;EVariable&lt;/tt&gt; expression.&lt;/p&gt;

&lt;p&gt;Two (top and bottom) $group stage builders should collaborate to be able to remove intermediary mkbson stage using the above mechanism.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The top&#160;&lt;tt&gt;GroupNode&lt;/tt&gt; stage builder does not ask for the result slot if the bottom node is a &lt;tt&gt;GroupNode&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;The top &lt;tt&gt;GroupNode&lt;/tt&gt; stage builder builds the bottom node.&lt;/li&gt;
	&lt;li&gt;The bottom &lt;tt&gt;GroupNode&lt;/tt&gt; does the same thing as usual except it does not add a mkbson stage at the end if the result slot is not requested. Instead, it returns field names and slots for _id and accumulator fields.&lt;/li&gt;
	&lt;li&gt;The top &lt;tt&gt;GroupNode&lt;/tt&gt; stage builder looks up its fields in the returned field names and slots from the bottom &lt;tt&gt;GroupNode&lt;/tt&gt;. If a field is found, then it updates &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt; with the returned slot id and let &lt;tt&gt;generateExpression&lt;/tt&gt;&apos;s &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt; visitor know it.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;ExpressionFieldPath&lt;/tt&gt; visitor will generate a simple variable expression if it finds a slot id set at &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt;.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Update:&lt;br/&gt;
Introducing a slot id to &lt;tt&gt;ExpressionFieldPath&lt;/tt&gt; would be more general optimization for field paths, not just for $group. Consider the above $group case as just an example. So, changed the title.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1891135">SERVER-60484</key>
            <summary>Optimize field paths more generally</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="3">Duplicate</resolution>
                                        <assignee username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 6 Oct 2021 04:05:23 +0000</created>
                <updated>Tue, 19 Oct 2021 23:07:58 +0000</updated>
                            <resolved>Tue, 19 Oct 2021 23:07:58 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4133864" author="JIRAUSER1258488" created="Tue, 19 Oct 2021 23:07:58 +0000"  >&lt;p&gt;Close this ticket in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60234&quot; title=&quot;Implement plumbing for getField() pushdown in the SBE stage builder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60234&quot;&gt;&lt;del&gt;SERVER-60234&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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