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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79934] Investigate window stage interface with regular and repeated slots</title>
                <link>https://jira.mongodb.org/browse/SERVER-79934</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the window stage interface has two problems:&lt;/p&gt;

&lt;p&gt;1) It doesn&apos;t allow the expressions to make use of the first and last document in range, this is needed for window functions like $derivative, $first, and $last, leading to an inefficient VM algorithm.&lt;br/&gt;
2) The stage interface is non-regular, in the sense that the slots are categorized as partition slots, forward slots, bound slots, and bound testing slots, where each category of slots only corresponds to part of what&apos;s saved in the window buffer. However, we can redesign the interface to be more regular so that, we have a list of buffer slots repeated over multiple documents, so that each slot functionality has access to all the saved slots in the buffer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2415523">SERVER-79934</key>
            <summary>Investigate window stage interface with regular and repeated slots</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="13201">Fixed</resolution>
                                        <assignee username="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Aug 2023 14:37:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:41 +0000</updated>
                            <resolved>Thu, 7 Sep 2023 19:39:23 +0000</resolved>
                                                    <fixVersion>7.1.0-rc2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5687836" author="xgen-internal-githook" created="Thu, 7 Sep 2023 19:33:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79934&quot; title=&quot;Investigate window stage interface with regular and repeated slots&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79934&quot;&gt;&lt;del&gt;SERVER-79934&lt;/del&gt;&lt;/a&gt; Implement window stage interface repeated slots&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c22b1fdadf4ba6528d6aac281a4d85cfe1f98c8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c22b1fdadf4ba6528d6aac281a4d85cfe1f98c8f&lt;/a&gt;&lt;/p&gt;</comment>
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