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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>
    </build-info>


<item>
            <title>[SERVER-33005] Contained $or access planning is incorrect for $elemMatch object, results in invariant failure</title>
                <link>https://jira.mongodb.org/browse/SERVER-33005</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The server crashes when a query is eligible for an OR pushdown through an $elemMatch object with an $or descendent. This issue only affects query shapes that involve an $elemMatch-$or construction, such as the following:&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;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="489554">SERVER-33005</key>
            <summary>Contained $or access planning is incorrect for $elemMatch object, results in invariant failure</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Jan 2018 15:27:12 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:19 +0000</updated>
                            <resolved>Fri, 9 Feb 2018 22:11:20 +0000</resolved>
                                    <version>3.6.0</version>
                    <version>3.7.1</version>
                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.2</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1803052" author="xgen-internal-githook" created="Mon, 12 Feb 2018 17:19:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33005&quot; title=&quot;Contained $or access planning is incorrect for $elemMatch object, results in invariant failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33005&quot;&gt;&lt;del&gt;SERVER-33005&lt;/del&gt;&lt;/a&gt; Fix planner to avoid incorrect OR pushdown through $elemMatch.&lt;/p&gt;

&lt;p&gt;The PlanEnumerator now tracks pushdown routes which descend&lt;br/&gt;
through an $elemMatch object. These routes are pruned when&lt;br/&gt;
subsequently descending through an OR.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 17b4094c4d781ffd486b27869f46eea706e490af)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/228a8e7d410ae01dc2ee8b90a83ddf08aa219bc9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/228a8e7d410ae01dc2ee8b90a83ddf08aa219bc9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1801587" author="xgen-internal-githook" created="Fri, 9 Feb 2018 22:10:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33005&quot; title=&quot;Contained $or access planning is incorrect for $elemMatch object, results in invariant failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33005&quot;&gt;&lt;del&gt;SERVER-33005&lt;/del&gt;&lt;/a&gt; Fix planner to avoid incorrect OR pushdown through $elemMatch.&lt;/p&gt;

&lt;p&gt;The PlanEnumerator now tracks pushdown routes which descend&lt;br/&gt;
through an $elemMatch object. These routes are pruned when&lt;br/&gt;
subsequently descending through an OR.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/17b4094c4d781ffd486b27869f46eea706e490af&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/17b4094c4d781ffd486b27869f46eea706e490af&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1792285" author="david.storch" created="Thu, 1 Feb 2018 20:21:30 +0000"  >&lt;p&gt;We&apos;re not handling OR pushdowns through $elemMatch object correctly in the PlanEnumerator. From logLevel 5 in the &quot;query&quot; component:&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;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2018-02-01T14:52:04.925-0500 D QUERY    [conn1] About to build solntree from tagged tree:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;$and&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    $or&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        b $elemMatch (obj)  || Selected Index #0 pos 1 combine 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;            $or&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;                c $eq 4.0  || Selected Index #0 pos 1 combine 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;                c $eq 5.0  || Selected Index #0 pos 1 combine 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        b $eq 2.0  || Selected Index #1 pos 0 combine 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    a $eq 1.0  || Move to 0,0 || Selected Index #0 pos 0 combine 1 || Move to 0,1 || Selected Index #0 pos 0 combine 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;In particular, note the OR pushdowns associated with the &quot;a $eq 1.0&quot; predicate. These pushdowns are not correct. Pushing down through the $elemMatch object causes the path to be &quot;b.a&quot; rather than just &quot;a&quot;, but index 0 does not include &quot;b.a&quot; in its key pattern.&lt;/p&gt;</comment>
                            <comment id="1791030" author="charlie.swanson" created="Wed, 31 Jan 2018 19:50:41 +0000"  >&lt;p&gt;This appears to have turned up another bug that needs investigation, or was harder to fix than we thought. Assigning to Dave to continue investigation.&lt;/p&gt;</comment>
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                            <attachment id="177256" name="repro.js" size="375" author="charlie.swanson@mongodb.com" created="Tue, 30 Jan 2018 15:24:02 +0000"/>
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&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;python buildscripts/resmoke.py repro.js&lt;/span&gt;&lt;/pre&gt;
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