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    <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-22857] eliminate redundant conditions/clauses from query</title>
                <link>https://jira.mongodb.org/browse/SERVER-22857</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When query format is something like &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&gt;
		&lt;/tr&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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.foo.find({ &quot;a&quot;: {&quot;id&quot;:1}, &quot;a&quot;:{$elemMatch:{&quot;id&quot;:1, &quot;b&quot;:9} } });&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;In both cases one of the query parts is 100% redundant of the rest.  This is to track optimizing it out of query consideration/evaluation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="268052">SERVER-22857</key>
            <summary>eliminate redundant conditions/clauses from query</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="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Feb 2016 17:32:41 +0000</created>
                <updated>Tue, 19 Dec 2023 14:05:08 +0000</updated>
                            <resolved>Tue, 19 Dec 2023 14:04:24 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="3279909" author="asya" created="Fri, 10 Jul 2020 16:56:05 +0000"  >&lt;p&gt;A couple of examples that came up that should probably be handled under this work:&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;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;{a:{$ne:null, $exists:true}}&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{a:{$gt:1, $exists:true}}&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;In fact, $exists clause is redundant alongside many/most other clauses on the same field, except null equality(there may be another one or two).  Note that we don&apos;t have this problematic behavior if it is a type check along with value comparison that already requires that type, I believe we fixed that when implementing partial index filters.&lt;/p&gt;

&lt;p&gt;Closely related ticket is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31360&quot; title=&quot;MatchExpression::getOptimizer() for $or/$and should collapse equivalent clauses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31360&quot;&gt;&lt;del&gt;SERVER-31360&lt;/del&gt;&lt;/a&gt; (for $or clauses, this one is for $and clauses).&lt;/p&gt;</comment>
                            <comment id="1227834" author="mitar" created="Wed, 6 Apr 2016 16:50:27 +0000"  >&lt;p&gt;This is important also because redundant clauses can throw unnecessary errors because they look like query might be ambiguous, see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18500&quot; title=&quot;Resolve ambiguity of positional projections with multiple implicit array traversal predicates in certain cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18500&quot;&gt;SERVER-18500&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="2293273">SERVER-75079</issuekey>
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            <issuekey id="439086">SERVER-31360</issuekey>
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                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1887664">SERVER-60373</issuekey>
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            <issuelink>
            <issuekey id="2457154">SERVER-81788</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2293273">SERVER-75079</issuekey>
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