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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-38952] Prune redundant index bound</title>
                <link>https://jira.mongodb.org/browse/SERVER-38952</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We hit this invariant when dealing with wildcard indexes and a query on a multikey field:&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/637adda0cefae579448117efcd868fa36f1010c0/src/mongo/db/query/index_bounds_builder.cpp#L1017&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/637adda0cefae579448117efcd868fa36f1010c0/src/mongo/db/query/index_bounds_builder.cpp#L1017&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This will be hit because the list of index bounds for the wildcard index contains a redundant index bound, (a range of values is covered by two bounds).&#160;&#160;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Reproduction:&lt;/b&gt;&#160;&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;
		&lt;tbody &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-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;db.mycoll.drop();&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;db.mycoll.createIndex({&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$**&quot;&lt;/span&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;: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;db.mycoll.insert({a:[1,2,3]});&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;db.mycoll.count({ &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;a.0.0.0&apos;&lt;/span&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;:{ $exists: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&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; }});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;This produces this failure:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;INVALID BOUNDS: field #0&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;#39;$_path&amp;#39;&amp;#93;&lt;/span&gt;:&#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;a.0.0&amp;quot;, &amp;quot;a.0.0&amp;quot;&amp;#93;&lt;/span&gt;, [&quot;a.0.0.&quot;, &quot;a.0.0/&quot;),&#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;a.0.0.0&amp;quot;, &amp;quot;a.0.0.0&amp;quot;&amp;#93;&lt;/span&gt;, [&quot;a.0.0.0.&quot;, &quot;a.0.0.0/&quot;), field #1&lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;#39;a.0.0.0&amp;#39;&amp;#93;&lt;/span&gt;:&#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;MinKey, MaxKey&amp;#93;&lt;/span&gt;kp = { $_path: 1.0, a.0.0.0: 1.0 }}}{{scanDir = 1&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&#160;These bounds are wrong because&#160; &quot;a.0.0/&quot; in the second bound pair is greater than &quot;a.0.0.0&quot; in the third pair. (Comparison is done by string comparison). Check out attached BF for the full backtrace!&lt;/p&gt;

&lt;p&gt;There exists code which is supposed to account for the case of redundant index bounds for a multi-key field, and prune the redundant index bound.&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/d1f23f929359ab6a7a996cc35d1e063e0e9a12a3/src/mongo/db/query/planner_wildcard_helpers.cpp#L424-L443&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/d1f23f929359ab6a7a996cc35d1e063e0e9a12a3/src/mongo/db/query/planner_wildcard_helpers.cpp#L424-L443&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, this logic does not capture the case above. To complete this ticket will involve changing this logic to act correctly when seeing the case above.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="670457">SERVER-38952</key>
            <summary>Prune redundant index bound</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="arun.banala@mongodb.com">Arun Banala</assignee>
                                    <reporter username="brigitte.lamarche@mongodb.com">Brigitte Lamarche</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Jan 2019 18:59:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:13 +0000</updated>
                            <resolved>Thu, 21 Feb 2019 10:44:25 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2158117" author="xgen-internal-githook" created="Thu, 21 Feb 2019 09:29:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Arun Banala&apos;, &apos;username&apos;: &apos;banarun&apos;, &apos;email&apos;: &apos;arun.banala@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38952&quot; title=&quot;Prune redundant index bound&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38952&quot;&gt;&lt;del&gt;SERVER-38952&lt;/del&gt;&lt;/a&gt; Prune redundant index bound&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8120e440ab45ab4bd8b1372aee23cae7fad6b01e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8120e440ab45ab4bd8b1372aee23cae7fad6b01e&lt;/a&gt;&lt;/p&gt;</comment>
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