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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85079] POC: Rewind functionality in document source machinery</title>
                <link>https://jira.mongodb.org/browse/SERVER-85079</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For window functions, in some cases we may want a &quot;two-pass&quot; execution approach such that a first pass computes the result and the second pass projects it to the desired document. This will prevent the need to cache all documents in a partition before streaming. Things to consider:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Add &quot;reset&quot; functionality to DS machinery, such that on the first pass we compute the accumulation result over the entire partition then seek back to the first document to project the new field. Would need to reset to the partition boundary as well.&lt;/li&gt;
	&lt;li&gt;Could re-use TeeBuffer and instead of pausing add functionality to spill to disk&lt;/li&gt;
	&lt;li&gt;Spool operator/stage?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1655185">SERVER-85079</key>
            <summary>POC: Rewind functionality in document source machinery</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Mar 2021 12:19:06 +0000</created>
                <updated>Fri, 12 Jan 2024 03:04:03 +0000</updated>
                            <resolved>Wed, 28 Apr 2021 14:15:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3743849" author="ted.tuckman" created="Wed, 28 Apr 2021 14:15:26 +0000"  >&lt;p&gt;We decided to go with the approach outlined in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85109&quot; title=&quot;POC: Spill to disk functionality in partition iterator for window functions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85109&quot;&gt;&lt;del&gt;WRITING-7751&lt;/del&gt;&lt;/a&gt;, so closing this.&lt;/p&gt;</comment>
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