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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-78878] Avoid adding a project before a group when there are too many group dependencies.</title>
                <link>https://jira.mongodb.org/browse/SERVER-78878</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;in certain cases when in the classic engine the rewrite that adds a project before a group is more expensive to evaluate then it is worth. perhaps we should not apply this optimization when we have more than N fields to project before the group. We noticed this when comparing 4.2 to 4.4&lt;/p&gt;</description>
                <environment></environment>
        <key id="2389056">SERVER-78878</key>
            <summary>Avoid adding a project before a group when there are too many group dependencies.</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="c.alonso@mongodb.com">Carlos Alonso P&#233;rez</assignee>
                                    <reporter username="mickey.winters@mongodb.com">Mickey Winters</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Jul 2023 20:28:17 +0000</created>
                <updated>Mon, 27 Nov 2023 16:22:40 +0000</updated>
                            <resolved>Mon, 27 Nov 2023 16:22:40 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5906185" author="mickey.winters" created="Mon, 27 Nov 2023 16:22:40 +0000"  >&lt;p&gt;When I originally opened this I thought the heuristic of if there are more than X fields in the group key then it is probably projecting the whole document. but even with the case of the customer that prompted me to open this there could be a situation like 400/700 fields projected so I doubt there is a safe value of X now. Realistically we might need statistics to figure out what X is, but bonsai is cost based and is already planned to determine if a project stage is actually worth it in this situation so no extra work is needed.&lt;/p&gt;</comment>
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