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            <title>[SERVER-83414] [CQF] Design how histogram CE interacts with parameterized queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-83414</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When parameterization is enabled in CQF, the intervals generated in SargableNodes are no-longer guaranteed to have constant bounds, they will be expressions. While we do maintain a mapping of parameter ID to constant in the given query, simply replacing references to parameters with constants is not sufficient, we&apos;d need to invoke constant folding to get back a set of intervals with constant bounds. Doing so would require copying an ABT with potentially large constants in it, which may have performance implications; since we don&apos;t have to mutate the ABT that CE is given, since that get inserted into the memo.&lt;/p&gt;

&lt;p&gt;This ticket is a placeholder for work to design and implement a solution to this problem. One idea: disable interval simplification in SargableNode and estimate the CE of all predicates independently; this would allow direct replacement of parameter markers for their constant values.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2503541">SERVER-83414</key>
            <summary>[CQF] Design how histogram CE interacts with parameterized queries</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
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                <created>Fri, 17 Nov 2023 18:35:56 +0000</created>
                <updated>Tue, 28 Nov 2023 13:51:04 +0000</updated>
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