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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-81888] Path fusion rewrite to mark the root of any constant path subtree as constant</title>
                <link>https://jira.mongodb.org/browse/SERVER-81888</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The motivation is related to&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79367&quot; title=&quot;Optimize projections in Bonsai &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79367&quot;&gt;&lt;del&gt;SERVER-79367&lt;/del&gt;&lt;/a&gt;. Consider the following path:&lt;/p&gt;

&lt;p&gt;Drop &quot;a&quot; * Field &quot;a&quot; p&lt;/p&gt;

&lt;p&gt;Where p is some arbitrary path. If we try to convert to MakeObjSpec, we will fail to translate the PathComposeM because there is no way to encode &quot;pass Nothing to p and set field &apos;a&apos; to the output&quot;. This sort of path comes up when we have consecutive projection stages where we exclude a path and then set that path to something else.&lt;/p&gt;

&lt;p&gt;Because we fail to translate, we will fallback to lowering, which is provably slow. We can do better. Note the following:&lt;/p&gt;

&lt;p&gt;Drop &quot;a&quot; = Field &quot;a&quot; Const Nothing&lt;br/&gt;
=&amp;gt;&lt;br/&gt;
Field &quot;a&quot; Const Nothing * Field &quot;a&quot; p = Field &quot;a&quot; (Const Nothing * p) = Field &quot;a&quot; Const (p | Nothing)&lt;/p&gt;

&lt;p&gt;If we can perform this rewrite, e.g. by setting the child of PathConst to (Const Nothing * p), then we can definitely translate a path of the form Field &quot;a&quot; Const c to MakeObjSpec/ get a better plan.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2460729">SERVER-81888</key>
            <summary>Path fusion rewrite to mark the root of any constant path subtree as constant</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alya.berciu@mongodb.com">Alya Berciu</reporter>
                        <labels>
                            <label>M9</label>
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                <created>Thu, 5 Oct 2023 12:03:45 +0000</created>
                <updated>Tue, 9 Jan 2024 11:59:14 +0000</updated>
                                                                                                <votes>0</votes>
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