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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-28957] Index bounds are not detected correctly</title>
                <link>https://jira.mongodb.org/browse/SERVER-28957</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Documents with two fields: {sort:..,x:...}&lt;br/&gt;
Index on {sort:1,x:1}&lt;/p&gt;

&lt;p&gt;The query on &quot;x&quot; sorted by the sort field doesn&apos;t detect proper index bounds for x:&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;&amp;gt; db.test.find({x:{$gte:1,$lte:3}}).sort({sort:1}).explain(&quot;executionStats&quot;).executionStats.executionStages.inputStage.indexBounds&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;{ &quot;sort&quot; : [ &quot;[MinKey, MaxKey]&quot; ], &quot;x&quot; : [ &quot;[MinKey, MaxKey]&quot; ] }&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;However, adding an all-inclusive condition on &quot;sort&quot; into the query fixes the problem:&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;&amp;gt; db.test.find({sort:{$gte:MinKey},x:{$gte:1,$lte:3}}).sort({sort:1}).explain(&quot;executionStats&quot;).executionStats.executionStages.inputStage.indexBounds&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;{ &quot;sort&quot; : [ &quot;[MinKey, MaxKey]&quot; ], &quot;x&quot; : [ &quot;[1.0, 3.0]&quot; ] }&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;
</description>
                <environment></environment>
        <key id="377332">SERVER-28957</key>
            <summary>Index bounds are not detected correctly</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="3">Duplicate</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Apr 2017 13:31:10 +0000</created>
                <updated>Mon, 8 May 2017 17:07:18 +0000</updated>
                            <resolved>Mon, 8 May 2017 17:07:18 +0000</resolved>
                                    <version>3.4.2</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1566983" author="david.storch" created="Mon, 8 May 2017 17:06:50 +0000"  >&lt;p&gt;I am closing as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13197&quot; title=&quot;Tighten index bounds and allow compound index to be chosen when predicate on leading field is not provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13197&quot;&gt;SERVER-13197&lt;/a&gt;. The scenarios are slightly different (this one uses a sort, the other uses a hint) but the essence is the same: when there is no predicate on the leading field of the index, the query planner is not able to constrain the index bounds of the trailing fields.&lt;/p&gt;

&lt;p&gt;There is no fundamental reason that we couldn&apos;t construct bounds for the trailing fields. However, the planner has quite a bit of index selection and plan enumeration logic which depends on differential treatment of leading versus trailing fields of a compound index. Extending the planner to generate better index bounds in cases like this one will therefore involve significant development effort from the Query Team.&lt;/p&gt;</comment>
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