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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-70436] Restrict cases where isCoveredNullQuery can apply</title>
                <link>https://jira.mongodb.org/browse/SERVER-70436</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are additional cases where we cannot use an index to cover a null query when we have multiple clauses in $or or $in. We should make sure to add a FETCH stage above the index scan when the index scan bounds are not exact for the non-null part of the predicate, even if we can cover the null part of the query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2156296">SERVER-70436</key>
            <summary>Restrict cases where isCoveredNullQuery can apply</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="alya.berciu@mongodb.com">Alya Berciu</assignee>
                                    <reporter username="alya.berciu@mongodb.com">Alya Berciu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Oct 2022 09:11:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:04 +0000</updated>
                            <resolved>Fri, 4 Nov 2022 14:02:00 +0000</resolved>
                                                    <fixVersion>6.1.1</fixVersion>
                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4964079" author="xgen-internal-githook" created="Tue, 8 Nov 2022 17:14:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alya Berciu&apos;, &apos;email&apos;: &apos;alya.berciu@mongodb.com&apos;, &apos;username&apos;: &apos;alyacb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70436&quot; title=&quot;Restrict cases where isCoveredNullQuery can apply&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70436&quot;&gt;&lt;del&gt;SERVER-70436&lt;/del&gt;&lt;/a&gt; Handle covered $or null queries with regex&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e3381f8a26e6bb01d4715961f6babadff651de0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e3381f8a26e6bb01d4715961f6babadff651de0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4963109" author="xgen-internal-githook" created="Tue, 8 Nov 2022 14:11:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alya Berciu&apos;, &apos;email&apos;: &apos;alya.berciu@mongodb.com&apos;, &apos;username&apos;: &apos;alyacb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70436&quot; title=&quot;Restrict cases where isCoveredNullQuery can apply&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70436&quot;&gt;&lt;del&gt;SERVER-70436&lt;/del&gt;&lt;/a&gt; Handle covered $or null queries with regex&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d7d31af73e667c1f65a162a39b7b27eec11e570&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d7d31af73e667c1f65a162a39b7b27eec11e570&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4954846" author="xgen-internal-githook" created="Fri, 4 Nov 2022 13:01:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alya Berciu&apos;, &apos;email&apos;: &apos;alya.berciu@mongodb.com&apos;, &apos;username&apos;: &apos;alyacb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70436&quot; title=&quot;Restrict cases where isCoveredNullQuery can apply&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70436&quot;&gt;&lt;del&gt;SERVER-70436&lt;/del&gt;&lt;/a&gt; Handle covered $or null queries with regex&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca6499eb6111f89758fcb71b319e8b5d0cd03a20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca6499eb6111f89758fcb71b319e8b5d0cd03a20&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;See HELP-38275.&lt;/p&gt;

&lt;p&gt;There is an additional case where we run into a similar problem:&lt;/p&gt;

&lt;p&gt;db.coll.insertMany([{_id: 1, &quot;a&quot; : [ 1, 2, 3 ] }, {_id: 2, a: null}])&lt;/p&gt;

&lt;p&gt;db.coll.aggregate({$match: {a: {$in: [&lt;span class=&quot;error&quot;&gt;&amp;#91;2&amp;#93;&lt;/span&gt;, null, []]}}}, {$project: {_id: 1}}) -&amp;gt; returns {_id: 2}&lt;/p&gt;

&lt;p&gt;db.coll.createIndex({a: 1})&lt;/p&gt;

&lt;p&gt;db.coll.aggregate({$match: {a: {$in: [&lt;span class=&quot;error&quot;&gt;&amp;#91;2&amp;#93;&lt;/span&gt;, null, []]}}}, {$project: {_id: 1}}) -&amp;gt; returns {_id: 1} and {_id: 2}&lt;/p&gt;</customfieldvalue>

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