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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-85848] $redact inhibits change stream optimization</title>
                <link>https://jira.mongodb.org/browse/SERVER-85848</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5202fce591b77bf54b3fee356c1ce1f21b3694e4/src/mongo/db/pipeline/document_source_change_stream_ensure_resume_token_present.cpp#L84-L90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DSCSEnsureResumeTokenPresent&lt;/tt&gt;&lt;/a&gt; and internal &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5202fce591b77bf54b3fee356c1ce1f21b3694e4/src/mongo/db/pipeline/document_source_change_stream_handle_topology_change.cpp#L169-L173&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DSCSHandleTopologyChange&lt;/tt&gt;&lt;/a&gt; stages are permitted to swap with &lt;tt&gt;$match&lt;/tt&gt; and single-document transformation stages during optimization, to allow user-specified stages to be moved closer to the front of the pipeline, and in particular to allow them to be pushed down to the shards in a cluster deployment. The &lt;tt&gt;$redact&lt;/tt&gt; stage is &lt;a href=&quot;https://www.mongodb.com/docs/manual/changeStreams/#modify-change-stream-output&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;allowed in a change stream pipeline&lt;/a&gt;, but it is not internally implemented or recognised as a single-document transformation; it therefore does not get moved ahead of the change stream stages mentioned above, and does not get pushed down to the shards. This can in turn inhibit any stages after the &lt;tt&gt;$redact&lt;/tt&gt; from being pushed down, which negatively affects performance for &lt;tt&gt;$match&lt;/tt&gt; and &lt;tt&gt;$project&lt;/tt&gt;-like stages, and in the case of the split large events stage will prevent large events from being fragmented on the shards before being sent to &lt;tt&gt;mongoS&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2559574">SERVER-85848</key>
            <summary>$redact inhibits change stream 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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jan 2024 09:44:07 +0000</created>
                <updated>Thu, 8 Feb 2024 00:46:23 +0000</updated>
                                                                                                <votes>0</votes>
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