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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-49721] [SBE] Using dot notation in find() to query embedded document in array field is broken in some cases</title>
                <link>https://jira.mongodb.org/browse/SERVER-49721</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When looking at possible ways to refactor some of the logic in &quot;sbe_stage_builder_filter.cpp&quot;, I enabled SBE mode and tested out some cases that involved using dot notation in find() to query embedded documents inside an array field, and I noticed it was broken in some cases.&lt;/p&gt;

&lt;p&gt;Given a document with a field &quot;a&quot; that contains an array of with two embedded documents, when the dot notation &quot;a.b&quot; is used in the find() command to match against the contents of field &quot;b&quot;, it appears impossible for the operator to ever match against the second embedded document in the array if the first embedded document does not contain field &quot;b&quot;. See the example in the &quot;Steps to Reproduce&quot; section for a specific example.&lt;/p&gt;

&lt;p&gt;From my initial investigation, it seems this is happening because of the specific &quot;fold&quot; expression that is being passed into TraverseStage in &quot;sbe_stage_builder_filter.cpp&quot; and how this expression behaves when it is translated to bytecode and executed in the VM.&lt;/p&gt;

&lt;p&gt;The &quot;fold&quot; expression being pased into TraverseStage is &quot;logicOr(_outField,&#160;_outFieldInner)&quot;. I looked at the bytecode that is generated for this expression and how it behaved. First, it is important to note that there is no implicit &quot;cast to bool&quot; that is happening to the arguments being passed to logicOr(), but rather the&#160;values of the arguments are being directly fed to the logicOr(). The bytecode generated doesn&apos;t do quite what I would have expected. Here is a summary of what the bytecode essentially does:&lt;br/&gt;
 1) If LHS is Nothing or Boolean True, then logicOr() returns LHS.&lt;br/&gt;
 2) If LHS is not Nothing or Boolean True, then logicOr() returns RHS.&lt;/p&gt;

&lt;p&gt;Now let&apos;s consider the example in &quot;Steps to Reproduce&quot; and look at why db.c.find({&quot;a.b&quot;:&quot;foo&quot;}) doesn&apos;t match the first document in c even though it should. When TraverseStage applies the projection (getField(&quot;b&quot;)) to the first element of the array in field &quot;a&quot;, getField(&quot;b&quot;) returns Nothing (because the embedded document doesn&apos;t have a field named &quot;b&quot;). Because this is the first element of the array, Traverse doesn&apos;t evaluate the fold expression - instead it just stores Nothing directly in the &quot;_outField&quot; slot. Next,&#160;TraverseStage applies the projection (getField()) to the second element of the array, and getField(&quot;b&quot;) returns &quot;foo&quot;. TraverseStage then evaluates the fold expression, which in this case is &apos;logicOr(Nothing,&quot;foo&quot;)&apos;. Because of the behavior of logicOr() that I described above, &apos;logicOr(Nothing,&quot;foo&quot;)&apos; returns Nothing. As a result, the first document in c doesn&apos;t pass the filter even though it should.&lt;/p&gt;

&lt;p&gt;Given this, in order to fix this bug I think we need to do one or more of the following:&lt;br/&gt;
 1) Change the fold expression we pass to TraverseStage in &quot;sbe_stage_builder_filter.cpp&quot;.&lt;br/&gt;
 2) Change logicOr() to implicitly coerce both of its arguments to boolean first.&lt;br/&gt;
 3) Change logicOr() to behave differently when one or both of its arguments is Nothing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1414293">SERVER-49721</key>
            <summary>[SBE] Using dot notation in find() to query embedded document in array field is broken in some cases</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="andrew.paroski@mongodb.com">Drew Paroski</assignee>
                                    <reporter username="andrew.paroski@mongodb.com">Drew Paroski</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Sun, 19 Jul 2020 02:18:05 +0000</created>
                <updated>Thu, 23 Jul 2020 16:37:36 +0000</updated>
                            <resolved>Thu, 23 Jul 2020 16:35:49 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3299178" author="andrew.paroski" created="Thu, 23 Jul 2020 16:37:36 +0000"  >&lt;p&gt;It turns out this task described a different manifestation of the bug described in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49723&quot; title=&quot;[SBE] Using find() to query values in array field is broken in some cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49723&quot;&gt;&lt;del&gt;SERVER-49723&lt;/del&gt;&lt;/a&gt;&#160;. The diff that fixed&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49723&quot; title=&quot;[SBE] Using find() to query values in array field is broken in some cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49723&quot;&gt;&lt;del&gt;SERVER-49723&lt;/del&gt;&lt;/a&gt;&#160;also fixed this issue. Closing as &quot;Duplicate&quot;.&lt;/p&gt;</comment>
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&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.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: false})&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;{ &quot;was&quot; : false, &quot;ok&quot; : 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;&amp;gt; db.c.find({},{_id:0})&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;{ &quot;a&quot; : [ {  }, { &quot;b&quot; : &quot;foo&quot; } ] }&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;{ &quot;a&quot; : [ { &quot;b&quot; : &quot;foo&quot; }, {  } ] }&lt;/span&gt;&lt;/pre&gt;
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		&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; db.c.find({&quot;a.b&quot;:&quot;foo&quot;},{_id:0})&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;   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;a&quot; : [ {  }, { &quot;b&quot; : &quot;foo&quot; } ] }&lt;/span&gt;&lt;/pre&gt;
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					&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;a&quot; : [ { &quot;b&quot; : &quot;foo&quot; }, {  } ] }&lt;/span&gt;&lt;/pre&gt;
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&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.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true})&lt;/span&gt;&lt;/pre&gt;
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		&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;{ &quot;was&quot; : false, &quot;ok&quot; : 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;&amp;gt; db.c.find({&quot;a.b&quot;:&quot;foo&quot;},{_id:0})&lt;/span&gt;&lt;/pre&gt;
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		&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;a&quot; : [ { &quot;b&quot; : &quot;foo&quot; }, {  } ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/div&gt;
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