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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-42333] Make SortKeyGenerator return KeyString and use KeyString for sort key metadata</title>
                <link>https://jira.mongodb.org/browse/SERVER-42333</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The storage team is planning to make the BtreeKeyGenerator capable of returning index keys formatted as KeyString rather than BSONObj. Once this is done, it should become straightforward to reimplement the SortKeyGenerator, which uses the BtreeKeyGenerator internally, to return a document&apos;s sort key as a KeyString. This KeyString format could then be attached in lieu of a BSONObj as a Document&apos;s sort key metadata. Since KeyString comparison is cheap, we expect that this should improve the performance for executing blocking sorts in both the &lt;tt&gt;find&lt;/tt&gt; and &lt;tt&gt;aggregate&lt;/tt&gt; commands.&lt;/p&gt;

&lt;p&gt;We should also look into using KeyString as the wire format for sort keys. Some query plans require that one node computes a sort key and another later ingests this sort key in order to compute a merge sort (e.g. when each shard returns sorted data, and a mongos needs to merge sort). Using the KeyString as the wire format would make this merge sort cheaper for the merging node to compute, and would avoid any differences between the in-memory and over-the-wire sort key formats.&lt;/p&gt;</description>
                <environment></environment>
        <key id="870367">SERVER-42333</key>
            <summary>Make SortKeyGenerator return KeyString and use KeyString for sort key metadata</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>
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                <created>Mon, 22 Jul 2019 19:57:31 +0000</created>
                <updated>Tue, 6 Dec 2022 02:53:08 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
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