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    <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-67264] Avoid COLUMN_SCAN if dependencies prefix each other as in &quot;a&quot; and &quot;a.b&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-67264</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There&apos;s currently a dassert that fails if this scenario arises. I think that parent/child dependencies (or more generally &apos;ancestral&apos; dependencies like &quot;a&quot; and &quot;a.b.c&quot;) should probably disqualify a COLUMN_SCAN since we will need to go to the row store probably to re-assemble the parent. This may not be the case in all cases, but should be a fairly good heuristic for the time being. For example I could imagine querying for {&lt;tt&gt;a.nested: {$exists: false&lt;/tt&gt;}} and somehow knowing that means that in all matching results &lt;tt&gt;a&lt;/tt&gt; will be a scalar value. &lt;/p&gt;

&lt;p&gt;I think fixing it to work in this case would not be too bad, but it&apos;s probably not something that would be beneficial most of the time. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2068273">SERVER-67264</key>
            <summary>Avoid COLUMN_SCAN if dependencies prefix each other as in &quot;a&quot; and &quot;a.b&quot;</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Jun 2022 15:05:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:50 +0000</updated>
                            <resolved>Tue, 16 Aug 2022 22:11:41 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4755948" author="xgen-internal-githook" created="Tue, 16 Aug 2022 21:53:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67264&quot; title=&quot;Avoid COLUMN_SCAN if dependencies prefix each other as in &amp;quot;a&amp;quot; and &amp;quot;a.b&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67264&quot;&gt;&lt;del&gt;SERVER-67264&lt;/del&gt;&lt;/a&gt; Avoid COLUMN_SCAN if query needs overlapping fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/39e4b0c6ac51e8127c2afdaf7cc39742df6df5e1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/39e4b0c6ac51e8127c2afdaf7cc39742df6df5e1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4621870" author="charlie.swanson" created="Thu, 16 Jun 2022 19:21:08 +0000"  >&lt;p&gt;Going to mark this as &quot;depends on&quot; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66418&quot; title=&quot;Bad projection created during dependency analysis due to string order assumption&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66418&quot;&gt;&lt;del&gt;SERVER-66418&lt;/del&gt;&lt;/a&gt; and delay getting started on it in hopes of sharing some code/strategy from that patch.&lt;/p&gt;</comment>
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            <issuekey id="2106882">SERVER-68570</issuekey>
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            <issuekey id="2081408">SERVER-67742</issuekey>
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