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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42336] Direct KeyString to Document/Value conversion</title>
                <link>https://jira.mongodb.org/browse/SERVER-42336</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42181&quot; title=&quot;Make WorkingSetMember hold Document instead of BSONObj&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42181&quot;&gt;&lt;del&gt;SERVER-42181&lt;/del&gt;&lt;/a&gt;, we plan to make &lt;tt&gt;WorkingSetMember&lt;/tt&gt; represent the data at query runtime as Document/Value instead of BSONObj. This is part of an effort to unify &lt;tt&gt;DocumentSource&lt;/tt&gt; and &lt;tt&gt;PlanStage&lt;/tt&gt; to use the same data representation. Currently, &lt;tt&gt;DocumentSource&lt;/tt&gt; uses Document/Value and &lt;tt&gt;PlanStage&lt;/tt&gt; uses BSON.&lt;/p&gt;

&lt;p&gt;As part of this work, we will likely change &lt;tt&gt;WorkingSetMember&lt;/tt&gt; to use a Document/Value representation for index keys. The storage format for index keys is &lt;tt&gt;KeyString&lt;/tt&gt;. Therefore, a simplistic implementation of this change would require the &lt;tt&gt;KeyString&lt;/tt&gt; to be converted into a &lt;tt&gt;BSONObj&lt;/tt&gt;, and then the &lt;tt&gt;BSONObj&lt;/tt&gt; to subsequently be converted into a &lt;tt&gt;Document&lt;/tt&gt; (or maybe a &lt;tt&gt;vector&amp;lt;Value&amp;gt;&lt;/tt&gt;, depending on what index key representation we choose). We could optimize this two-step conversion by implementing a way to convert a &lt;tt&gt;KeyString&lt;/tt&gt; directly into Document/Value, and using this new conversion in the implementation of index access stages such as IXSCAN and DISTINCT_SCAN.&lt;/p&gt;</description>
                <environment></environment>
        <key id="870428">SERVER-42336</key>
            <summary>Direct KeyString to Document/Value conversion</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Jul 2019 20:33:47 +0000</created>
                <updated>Tue, 6 Dec 2022 02:53:06 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2435001" author="david.storch" created="Thu, 26 Sep 2019 18:18:49 +0000"  >&lt;p&gt;I&apos;m flagging this for re-triage, since I don&apos;t think we currently plan to implement it as part of the &quot;single sort implementation for query execution&quot; project.&lt;/p&gt;</comment>
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