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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-13677] Query planner should traverse through $all while handling $elemMatch object predicates</title>
                <link>https://jira.mongodb.org/browse/SERVER-13677</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of April 30, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Queries which have the format below fail when there&apos;s an index reaching into the deepest subfield. The format is an &lt;tt&gt;$elemMatch&lt;/tt&gt; operator that has an &lt;tt&gt;$all&lt;/tt&gt; descendent, which in turn has another &lt;tt&gt;$elemMatch&lt;/tt&gt; inside:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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.coll.find({z: 1, &quot;a.b&quot;: {$elemMatch: {c: {$all: [{$elemMatch: {d: 0}}]}}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Low user impact due to the very specific format of the query required to trigger the bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
If the &lt;tt&gt;$all&lt;/tt&gt; operator is rewritten as an &lt;tt&gt;$and&lt;/tt&gt; this issue is not triggered:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&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.coll.find({z: 1, &quot;a.b&quot;: {$elemMatch: {$and: [{c: [{$elemMatch: {d: 0}}]}]}}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;


&lt;p&gt;&lt;b&gt;RESOLUTION&lt;/b&gt;&lt;br/&gt;
The bug arose from the query planner failing to consider predicates nested inside an $elemMatch-$all-$elemMatch chain. The planner logic was adjusted so that these predicates are no longer ignored.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Version 2.6.0 is affected by this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.1 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;See the code here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a7f594977627996aa8731e936ef9c3801d512fc0/src/mongo/db/query/planner_access.cpp#L484-L497&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/a7f594977627996aa8731e936ef9c3801d512fc0/src/mongo/db/query/planner_access.cpp#L484-L497&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This function collects predicates from inside an $elemMatch object. Right now it traverses deeply through AND nodes and other ELEM_MATCH_OBJECT nodes. It should also traverse deeply through ALL. Failing to do so means that the access planner might miss predicates which are tagged to use the index, and hence fail to properly build the access plan.&lt;/p&gt;</description>
                <environment></environment>
        <key id="132579">SERVER-13677</key>
            <summary>Query planner should traverse through $all while handling $elemMatch object predicates</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Apr 2014 14:25:30 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:16 +0000</updated>
                            <resolved>Tue, 22 Apr 2014 18:36:26 +0000</resolved>
                                    <version>2.6.0</version>
                    <version>2.6.1-rc0</version>
                                    <fixVersion>2.6.1</fixVersion>
                    <fixVersion>2.7.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="568126" author="xgen-internal-githook" created="Wed, 30 Apr 2014 14:42:35 +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-13677&quot; title=&quot;Query planner should traverse through $all while handling $elemMatch object predicates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13677&quot;&gt;&lt;del&gt;SERVER-13677&lt;/del&gt;&lt;/a&gt; traverse through ALL when finding predicates inside elemMatch object&lt;br/&gt;
(cherry picked from commit 54bdb39ba62c25ef59221fcab866501c02a06047)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a900b9d4f43f866c1762247689c60944889ce08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a900b9d4f43f866c1762247689c60944889ce08&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="559254" author="xgen-internal-githook" created="Tue, 22 Apr 2014 18:36:08 +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-13677&quot; title=&quot;Query planner should traverse through $all while handling $elemMatch object predicates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13677&quot;&gt;&lt;del&gt;SERVER-13677&lt;/del&gt;&lt;/a&gt; traverse through ALL when finding predicates inside elemMatch object&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54bdb39ba62c25ef59221fcab866501c02a06047&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54bdb39ba62c25ef59221fcab866501c02a06047&lt;/a&gt;&lt;/p&gt;</comment>
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