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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>[DOCS-8779] $all now choose optimal condition not the first one</title>
                <link>https://jira.mongodb.org/browse/DOCS-8779</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/query/all/#performance&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/query/all/#performance&lt;/a&gt;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Queries that use the $all operator must scan all the documents that match the first element in the $all expression. As a result, even with an index to support the query, the operation may be long running, particularly when the first element in the $all expression is not very selective.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16042&quot; title=&quot;Optimise $all/$and to select smallest subset as initial index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16042&quot;&gt;&lt;del&gt;SERVER-16042&lt;/del&gt;&lt;/a&gt; fixed I think it&apos;s not the case anymore&lt;/p&gt;</description>
                <environment></environment>
        <key id="314479">DOCS-8779</key>
            <summary>$all now choose optimal condition not the first one</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="steve.renaker@mongodb.com">Steve Renaker</assignee>
                                    <reporter username="yaoxing.zhang@mongodb.com">Yaoxing Zhang</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Sep 2016 01:28:25 +0000</created>
                <updated>Wed, 9 Nov 2016 00:52:31 +0000</updated>
                            <resolved>Wed, 9 Nov 2016 00:52:27 +0000</resolved>
                                                    <fixVersion>3.4.0</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1429857" author="xgen-internal-githook" created="Wed, 9 Nov 2016 00:41:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;steveren&apos;, u&apos;name&apos;: u&apos;Steve Renaker&apos;, u&apos;email&apos;: u&apos;steve.renaker@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8779&quot; title=&quot;$all now choose optimal condition not the first one&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8779&quot;&gt;&lt;del&gt;DOCS-8779&lt;/del&gt;&lt;/a&gt;: $all now chooses optimal condition not the first one&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0c380381ebbd38f885d8f1b803d08dafc9002f4b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0c380381ebbd38f885d8f1b803d08dafc9002f4b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1386321" author="david.storch" created="Fri, 16 Sep 2016 15:23:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ravind.kumar&quot; class=&quot;user-hover&quot; rel=&quot;ravind.kumar&quot;&gt;ravind.kumar&lt;/a&gt;, it&apos;s probably sufficient to just delete it. This note is indeed out of date for all 3.2.x versions, as well as later patch releases of 2.6 and 3.0. If you were to replace it with anything, you could describe the new planning behavior introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16042&quot; title=&quot;Optimise $all/$and to select smallest subset as initial index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16042&quot;&gt;&lt;del&gt;SERVER-16042&lt;/del&gt;&lt;/a&gt;. Specifically, when there are multiple predicates over the leading field of a multikey index inside an &lt;tt&gt;$all&lt;/tt&gt; or &lt;tt&gt;$and&lt;/tt&gt;, the planner will generate and rank an alternative plan for each predicate.&lt;/p&gt;</comment>
                            <comment id="1386224" author="ravind.kumar" created="Fri, 16 Sep 2016 14:03:57 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; looking at &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16042&quot; title=&quot;Optimise $all/$and to select smallest subset as initial index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16042&quot;&gt;&lt;del&gt;SERVER-16042&lt;/del&gt;&lt;/a&gt; it seems this change is accurate - any additional info that might be desired?&lt;/p&gt;</comment>
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