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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-68517] Avoid object materialization for evaluation of field path expressions in column scan plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-68517</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to evaluate a field path expression (e.g. &quot;$address.state&quot;), we materialize an object and then evaluate the expression over that object. The goal of this ticket is to avoid creating the intermediate object when it is created only for the purpose of evaluating field path expressions.&lt;/p&gt;

&lt;p&gt;This will involve several sub-tasks/steps. Roughly:&lt;/p&gt;

&lt;p&gt;1) We will have to support evaluation of field path expressions using an SBE expression rather than an SBE plan stage tree.&lt;br/&gt;
2) We will have to support evaluation of field path expressions directly over array info.&lt;br/&gt;
3) We will need to track the use of field path expressions in the stage builder, and associate each one with a slot. We will attempt to do this only for certain query &quot;shapes.&quot;&lt;/p&gt;

&lt;p&gt;This work will be broken up into sub-tasks as we learn more. This ticket is to track the goal of avoiding materialization for simple $group queries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2105039">SERVER-68517</key>
            <summary>Avoid object materialization for evaluation of field path expressions in column scan plans</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="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>pm2646-m5</label>
                    </labels>
                <created>Tue, 2 Aug 2022 19:40:00 +0000</created>
                <updated>Thu, 12 Jan 2023 15:03:02 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4823134" author="charlie.swanson" created="Tue, 13 Sep 2022 16:47:46 +0000"  >&lt;p&gt;I&apos;m using &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69542&quot; title=&quot;Refactor how we track metadata slots&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69542&quot;&gt;&lt;del&gt;SERVER-69542&lt;/del&gt;&lt;/a&gt; to track my current work on this, and leaving this ticket open to track dotted fields in the future&lt;/p&gt;</comment>
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            <issuekey id="2132446">SERVER-69543</issuekey>
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