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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-85533] Investigate overlap between parameterization and shard targeting</title>
                <link>https://jira.mongodb.org/browse/SERVER-85533</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;cqf_explain.js is &lt;a href=&quot;https://parsley.mongodb.com/resmoke/c8e18445e128a578241e8a1df8d32106/test/17abdba7427f5e1cc5e2faa275bf1767?bookmarks=0,199&amp;amp;shareLine=112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;failing&lt;/a&gt; on this query with a &lt;tt&gt;$natural&lt;/tt&gt;&#160;hint because it expects an EOF plan, but the explain stages include&#160;&lt;tt&gt;ROOT,FILTER,COLLSCAN&lt;/tt&gt;. With parameterization on by default, we&apos;ll generate this COLLSCAN plan without inferring anything else in the index metadata that could lead to a different plan.&lt;/p&gt;

&lt;p&gt;const contradictionColl = db.contradictionColl;&lt;br/&gt;
contradictionColl.drop();&lt;br/&gt;
// The queries below against this collection will hint a collection scan, so they will go&lt;br/&gt;
// through Bonsai. The index metadata information will tell us that a is non-multikey so the&lt;br/&gt;
// query is a contradiction and will therefore result in an EOF plan. Note that we need to&lt;br/&gt;
// explicitly allow the query to go through saragable rewrites since by default M2 queries do&lt;br/&gt;
// not go through them.&lt;br/&gt;
contradictionColl.insert({a: 10});&lt;br/&gt;
contradictionColl.createIndex({a: 1});&lt;/p&gt;

&lt;p&gt;// Contradiction plan results in EOF plan, find.&lt;br/&gt;
analyzeFindExplain(db,&lt;br/&gt;
contradictionColl,&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;EOF&amp;quot;&amp;#93;&lt;/span&gt; /* expectedStandaloneStages */,&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;EOF&amp;quot;&amp;#93;&lt;/span&gt; /* expectedShardedStages */,&lt;br/&gt;
null /* expectedDir */,&lt;br/&gt;
isSharded,&lt;br/&gt;
{$and: &lt;span class=&quot;error&quot;&gt;&amp;#91;\{a: 2}, \{a: 3}&amp;#93;&lt;/span&gt;} /* query */,&lt;br/&gt;
{} /* projection */,&lt;br/&gt;
{$natural: 1} /* hint */,&lt;br/&gt;
false /* disableSargableRewrites */);&lt;/p&gt;

&lt;p&gt;Investigate the root cause, and turn parameterization back on in this test once fixed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2552874">SERVER-85533</key>
            <summary>Investigate overlap between parameterization and shard targeting</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="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="lynne.wang@mongodb.com">Lynne Wang</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Jan 2024 16:26:48 +0000</created>
                <updated>Tue, 30 Jan 2024 16:23:16 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2551295">SERVER-85454</issuekey>
        </issuelink>
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