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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-71871] [CQF] Satisfy &apos;Traverse ComposeM&apos; predicates with IndexScan + Filter</title>
                <link>https://jira.mongodb.org/browse/SERVER-71871</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you have an elemMatch with a conjunction:&lt;/p&gt;
&lt;p/&gt;
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			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Then we could generate a plan that scans a multikey index on {a: 1}, and apply the {x: 1, y: 1} predicate to each index key.  (And then do the &quot;is array&quot; check after fetching.)&lt;/p&gt;

&lt;p&gt;Bonsai does not consider this plan, because we relax the predicate to two separate Traverses:&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;Filter ... Get [a] Traverse ComposeM (Get [x] ...) (Get [y] ...)&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;-&amp;gt;&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;Sargable&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;  Get [a] Traverse Get [x] ...  perfOnly&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;  Get [a] Traverse Get [y] ...  perfOnly&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;This means we consider plans such as:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Full index scan, filter one predicate, fetch, filter on whole predicate&lt;/li&gt;
	&lt;li&gt;Index intersection of {a: 1} with itself&lt;/li&gt;
	&lt;li&gt;Collection scan&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(This is still an improvement over classic, which only considers a collection scan.  Even with hint({a: 1}), classic does not consider evaluating either predicate on the index side to reduce fetching.)&lt;/p&gt;

&lt;p&gt;Maybe this would break down into sub-features:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;an exploration rewrite that turns Traverse predicates into Unwind&lt;/li&gt;
	&lt;li&gt;a rewrite that matches Unwind with a multikey index&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2202862">SERVER-71871</key>
            <summary>[CQF] Satisfy &apos;Traverse ComposeM&apos; predicates with IndexScan + Filter</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="11262" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Investigating</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>Ideas</label>
                            <label>optimization</label>
                    </labels>
                <created>Mon, 5 Dec 2022 22:18:18 +0000</created>
                <updated>Mon, 16 Oct 2023 16:01:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                                                            <comments>
                            <comment id="5781647" author="JIRAUSER1273082" created="Mon, 16 Oct 2023 16:01:54 +0000"  >&lt;p&gt;Some notes from working on this ticket: &lt;a href=&quot;https://docs.google.com/document/d/18L_TcjDa36TEx46zYbNoBx-u2gtdY4SRTkJXPf-JuIQ/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/18L_TcjDa36TEx46zYbNoBx-u2gtdY4SRTkJXPf-JuIQ/edit&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5564679" author="david.percy" created="Thu, 13 Jul 2023 18:14:03 +0000"  >&lt;p&gt;Removing the &apos;bonsai-onboarding&apos; tag because I don&apos;t think this is a good onboarding ticket after all:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;It&apos;s a bit too open-ended, and may involve expand the scope of access path selection to handle Unwind, which is a bigger design decision.&lt;/li&gt;
	&lt;li&gt;The optimization itself is probably less beneficial than I originally thought, since a full index scan + expression + fetch is likely to be more expensive than a collection scan + expression.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5412473" author="david.percy" created="Tue, 9 May 2023 18:47:51 +0000"  >&lt;p&gt;Just to explain the idea a little more:&lt;/p&gt;

&lt;p&gt;This predicate &lt;tt&gt;Get &lt;span class=&quot;error&quot;&gt;&amp;#91;a&amp;#93;&lt;/span&gt; Traverse ComposeM (Get &lt;span class=&quot;error&quot;&gt;&amp;#91;x&amp;#93;&lt;/span&gt; Eq 1) (Get &lt;span class=&quot;error&quot;&gt;&amp;#91;y&amp;#93;&lt;/span&gt; Eq 1)&lt;/tt&gt; wants to check elements of &apos;a&apos; separately.  So it should be possible to use a physical plan 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;
		&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;...&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;Unique [rid]&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;Filter (p1.x = 1) and (p1.y = 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;IndexScan {a:1}, bind field &apos;a&apos; as [p1], bind record id as [rid]&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;This plan &lt;b&gt;doesn&apos;t use index intersection&lt;/b&gt;, and doesn&apos;t need to examine &apos;x&apos; or &apos;y&apos; after fetching.&lt;/p&gt;

&lt;p&gt;I don&apos;t think this works currently because we don&apos;t have a way to represent this in the logical plan / exploration phase.  We need use Traverse to visit array elements, and then check the {x:1, y:1} predicate on each one.&lt;/p&gt;

&lt;p&gt;I&apos;m imagining something like this:&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;Filter (p1.x = 1) and (p1.y = 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;Sargable [Index]&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;    Get [a] Traverse Id   bind as [p1]&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;but I don&apos;t think this is representable, currently.  We don&apos;t allow combining Traverse and an output binding this way.&lt;/p&gt;</comment>
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                            <subtask id="2356990">SERVER-77733</subtask>
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