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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-82978] [CQF] jstests/cqf/analyze/ce_sample_rate.js failed with parameterization enabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-82978</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2494641">SERVER-82978</key>
            <summary>[CQF] jstests/cqf/analyze/ce_sample_rate.js failed with parameterization enabled</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="ben.shteinfeld@mongodb.com">Ben Shteinfeld</assignee>
                                    <reporter username="jess.balint@mongodb.com">Jess Balint</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Nov 2023 19:53:10 +0000</created>
                <updated>Tue, 21 Nov 2023 21:23:45 +0000</updated>
                            <resolved>Tue, 21 Nov 2023 21:23:45 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5896850" author="xgen-internal-githook" created="Tue, 21 Nov 2023 21:22:32 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ben Shteinfeld&apos;, &apos;email&apos;: &apos;ben.shteinfeld@mongodb.com&apos;, &apos;username&apos;: &apos;bshteinfeld&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82978&quot; title=&quot;[CQF] jstests/cqf/analyze/ce_sample_rate.js failed with parameterization enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82978&quot;&gt;&lt;del&gt;SERVER-82978&lt;/del&gt;&lt;/a&gt; Disable parameterization when histogram CE is enabled&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/753c16d9f82e877763d18a53bf9e127b73b44f6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/753c16d9f82e877763d18a53bf9e127b73b44f6b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5889512" author="JIRAUSER1269946" created="Fri, 17 Nov 2023 22:10:24 +0000"  >&lt;p&gt;Abandoned &lt;a href=&quot;https://github.com/10gen/mongo/pull/16905&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/16905&lt;/a&gt; in favor of &lt;a href=&quot;https://github.com/10gen/mongo/pull/17022&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/17022&lt;/a&gt;. See PRs themselves for details.&lt;/p&gt;</comment>
                            <comment id="5871478" author="JIRAUSER1269946" created="Fri, 10 Nov 2023 16:49:32 +0000"  >&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83100&quot; title=&quot;[CQF] Use-after-free in aggregation with parameterization enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83100&quot;&gt;&lt;del&gt;SERVER-83100&lt;/del&gt;&lt;/a&gt; was resolved, this test was failing due to a mismatch between the CE outputted from histogram estimation and the actual number of documents returned via executionStats. This is caused by parameterization putting ABT expressions into bounds that are not Constants. This causes the &lt;a href=&quot;https://github.com/10gen/mongo/blob/c964d0c892fa985cedd9e875dbc84a641081f7d0/src/mongo/db/query/ce/bound_utils.cpp#L66-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;histogram estimator to fallback to the heuristic estimator&lt;/a&gt;. This causes us to return a heuristic CE for a predicate, which fails the test to fail as it was expecting a more accurate estimate.&lt;/p&gt;

&lt;p&gt;Fixing this will require us to design a mechanism for CE to get access to constants before parameterization. One way we could do this is add another child of FunctionCall&lt;span class=&quot;error&quot;&gt;&amp;#91;getParam&amp;#93;&lt;/span&gt; to hold this constant. We will need to consider how this interacts with interval simplifications which generate expressions as bounds. Since the CE module is estimating cardinality for a particular value of the parameter, we could perform replace the FunctionCall&lt;span class=&quot;error&quot;&gt;&amp;#91;getParam&amp;#93;&lt;/span&gt; with the constant and perform constant folding to get a constant for the bound and proceed with CE as usual. I suspect we&apos;ll need to do this for both histogram and sampling based CE.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2496396">SERVER-83100</issuekey>
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