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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-65363] Update logic should pass info about which fields changed to index layer</title>
                <link>https://jira.mongodb.org/browse/SERVER-65363</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now when we do an update the index layer gets the pre- and post-image document of the update. Then it will extract keys from both and perform a symmetric set difference to see which keys need to be added or removed updated in the index. And it does this for each index. This is wasteful for two reasons:&lt;/p&gt;

&lt;p&gt;1. We should be able to completely skip over indexes of fields that didn&apos;t change.&lt;br/&gt;
2. For indexes that cover multiple paths independently (eg wildcard and columnar, but not text), they can completely skip over fields that they know didn&apos;t change. &lt;/p&gt;

&lt;p&gt;Since most updates don&apos;t update most fields, most of the index work we do on updates is wasteful work to detect which fields didn&apos;t change.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2020190">SERVER-65363</key>
            <summary>Update logic should pass info about which fields changed to index layer</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
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                <created>Fri, 8 Apr 2022 10:47:45 +0000</created>
                <updated>Tue, 6 Dec 2022 00:16:55 +0000</updated>
                            <resolved>Fri, 8 Apr 2022 10:51:44 +0000</resolved>
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