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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55539] Allow $match filter based on mod of timestamp to participate in split for optimization</title>
                <link>https://jira.mongodb.org/browse/SERVER-55539</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One optimization goal for change streams is to make it possible for multiple observers of a collection, database, or cluster to operate in parallel by splitting the events from the stream into an arbitrary number of sub-sequences. For example, three clients with change streams, with each one observing every third event but staggered so that, together, they observe every event.&lt;/p&gt;

&lt;p&gt;The simplest way to split up a stream into sub-sequences for this purpose would be with a mod operator on the operation time. In order to operate on timestamps, a user will need to write a $expr that converts the timestamp to an integer, performs the $mod operation on it, and compares the result with $eq. Note that the non-aggregation $mod operator cannot operate on timestamps, making it unsuitable for this purpose.&lt;/p&gt;

&lt;p&gt;To make sure that this pattern really does divide resources between all the open change streams, the resulting $match needs to get pushed as far to the front of the pipeline as possible, which means the splitMatchByModifiedFields() optimization needs to recognize it as a simple read on a single field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1659870">SERVER-55539</key>
            <summary>Allow $match filter based on mod of timestamp to participate in split for optimization</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13203">Gone away</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Mar 2021 23:06:06 +0000</created>
                <updated>Fri, 27 Oct 2023 20:46:09 +0000</updated>
                            <resolved>Wed, 18 Aug 2021 17:15:20 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4007061" author="bernard.gorman" created="Wed, 18 Aug 2021 17:14:56 +0000"  >&lt;p&gt;This was done as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56872&quot; title=&quot;Add optimization function to apply $match predicates on change streams events directly to oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56872&quot;&gt;&lt;del&gt;SERVER-56872&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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