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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-12262] Use full index scan as proxy for collection scan in order to make certain queries covered</title>
                <link>https://jira.mongodb.org/browse/SERVER-12262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The old query system would prefer full index scans to collection scans in the case of covered queries. For example, with an index on field &apos;foo&apos; consider the following query:&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.t.find({foo: {$exists: true}}, {_id: 0, foo: 1});&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;This query would be covered by the index, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e89dccbef9b83ac8101dcceab64f5c6e09b6de50/jstests/covered_index_simple_3.js#L49&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hence this test which asserts that explain.indexOnly is true&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The new query system does not try to construct full index scans for things like $exists and $nin, preferring a collection scan instead. This means that in the new system, a FETCH stage is required and the query is not covered. As a performance improvement, we could eliminate these fetches and make such queries covered.&lt;/p&gt;</description>
                <environment></environment>
        <key id="104835">SERVER-12262</key>
            <summary>Use full index scan as proxy for collection scan in order to make certain queries covered</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Jan 2014 19:07:14 +0000</created>
                <updated>Mon, 11 Jul 2016 17:38:45 +0000</updated>
                            <resolved>Tue, 4 Mar 2014 16:34:05 +0000</resolved>
                                    <version>2.5.4</version>
                                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="509022" author="xgen-internal-githook" created="Tue, 4 Mar 2014 16:32:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12262&quot; title=&quot;Use full index scan as proxy for collection scan in order to make certain queries covered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12262&quot;&gt;&lt;del&gt;SERVER-12262&lt;/del&gt;&lt;/a&gt; re-enable test for negation of in query&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be24805004705e204a7640143f05bef408f6b210&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be24805004705e204a7640143f05bef408f6b210&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="508227" author="david.storch" created="Mon, 3 Mar 2014 19:07:22 +0000"  >&lt;p&gt;$nin was already changed to be able to use an index as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12532&quot; title=&quot;Negate index bounds for $not instead of defaulting to a collection scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12532&quot;&gt;&lt;del&gt;SERVER-12532&lt;/del&gt;&lt;/a&gt;. This can be resolved as soon as relevant tests are re-enabled.&lt;/p&gt;</comment>
                            <comment id="508214" author="samantha.ritter@10gen.com" created="Mon, 3 Mar 2014 18:51:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12557&quot; title=&quot;$exists could use index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12557&quot;&gt;&lt;del&gt;SERVER-12557&lt;/del&gt;&lt;/a&gt; solves the $exists part of this ticket, but I am hesitant to close this because it includes other types of queries like $nin.  &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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            <issuekey id="108562">SERVER-12557</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="114107">SERVER-12869</issuekey>
        </issuelink>
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