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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[COMPASS-6351] Investigate changes in PM-3050: Time Series Query Performance Optimizations</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6351</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    The explain output of a pipeline containing $_internalUnpackBucket and $group has been changed due to optimization.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;Implement in the classic Engine selected optimizations recommended by the &lt;a href=&quot;https://docs.google.com/document/d/1A6V3Tx5igdcXKjxIKX-tKbU4Mw0JWpJphpthxQoZjM8/edit#bookmark=id.x949xaajja28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Time-Series Query Performance Improvements Spike&lt;/a&gt; project.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;TIme Series query performance has not lived up to expectations, leading to dissatisfied customers and lost opportunities.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Query team has completed a prior Spike to investigate different approaches to optimize Time Series query performance. This project is a continuation of that work, with the aim of implementing the recommended solutions in production.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Due to the existing feature and performance gap in SBE, we have decided to implement these optimizations first in the classic engine, in order to deliver the gains confirmed in the Spike project.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This is part of the wider Time Series Initiative.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/1d2ZfQZFc03DGsgqjZir2b5jncPK4dE8ZZYbLLIrF5GU/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1TAHgnTsyYEaG7FwcQCZr5VZosyHxAnJwPZTyFLqnHwA/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1d2ZfQZFc03DGsgqjZir2b5jncPK4dE8ZZYbLLIrF5GU/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Design Document&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="2203420">COMPASS-6351</key>
            <summary>Investigate changes in PM-3050: Time Series Query Performance Optimizations</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
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                <created>Tue, 6 Dec 2022 12:33:43 +0000</created>
                <updated>Tue, 24 Jan 2023 09:27:14 +0000</updated>
                            <resolved>Tue, 24 Jan 2023 09:27:14 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5135406" author="maurizio.casimirri" created="Tue, 24 Jan 2023 09:27:14 +0000"  >&lt;p&gt;No Impact for DevTools&lt;/p&gt;</comment>
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