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<item>
            <title>[SERVER-54314] Relax field order assertions in jstests/aggregation/sources/project/project_with_expressions.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-54314</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1613207">SERVER-54314</key>
            <summary>Relax field order assertions in jstests/aggregation/sources/project/project_with_expressions.js</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 Feb 2021 22:30:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:56 +0000</updated>
                            <resolved>Thu, 18 Feb 2021 20:04:19 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3623835" author="xgen-internal-githook" created="Thu, 18 Feb 2021 19:59:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54314&quot; title=&quot;Relax field order assertions in jstests/aggregation/sources/project/project_with_expressions.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54314&quot;&gt;&lt;del&gt;SERVER-54314&lt;/del&gt;&lt;/a&gt; Relax field order assertions in jstests/aggregation/sources/project/project_with_expressions.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1347d04e7d2e9e7940fc5df0e8a32eed9d4a2e07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1347d04e7d2e9e7940fc5df0e8a32eed9d4a2e07&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3617436" author="mihai.andrei" created="Tue, 16 Feb 2021 16:54:18 +0000"  >&lt;p&gt;To clarify, the issue appears to reproduce when we have a projection with&#160;a mix of inclusion and computed projections. Suppose we have the document {a: 1, b: 2} in a collection &apos;c&apos; and we run the query db.c.find({}, {_id: 0, a: {$literal: 3}, b: 1})&lt;/p&gt;

&lt;p&gt;With the classic engine enabled, we will get { b : 2, a : 3 } (the inclusion projection comes before the computed projection) and with SBE enabled, we get { a : 3, b : 2 } (the fields appear in their original order).&lt;/p&gt;

&lt;p&gt;Note that the SBE plan for the above query is as follows:&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;[2] traverse s6 s5 s2&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;from&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;    [1] scan s2 s3 [] @&quot;1b12084b-0f04-4c88-8f80-9b80576bec3a&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;in&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;    [2] cfilter {isObject (s2)}&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;    [2] mkbson s5 s2 [b, _id] keep [a = s4] true 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;    [2] project [s4 = 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;   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;    [2] limit 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;    [2] coscan&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="3612481" author="mihai.andrei" created="Thu, 11 Feb 2021 20:27:29 +0000"  >&lt;p&gt;This test failure is the result of a divergence between the classic executor and SBE. Whereas the classic engine will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d99a1169d585e0ad71d6c03a2dfacc2d019f9a0/src/mongo/db/exec/inclusion_projection_executor.h#L221-L222&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;apply inclusion projections before applying computed expressions&lt;/a&gt; (see also &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d99a1169d585e0ad71d6c03a2dfacc2d019f9a0/src/mongo/db/exec/projection_node.cpp#L121-L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ProjectionNode::applyProjection&lt;/a&gt;), SBE will apply projections in the order &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d99a1169d585e0ad71d6c03a2dfacc2d019f9a0/src/mongo/db/exec/sbe/stages/makeobj.cpp#L262-L296&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;that fields appear in the original document&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;How we decide to fix this test failure depends on how we interpret the above. If we don&#8217;t have any strong guarantees about field ordering in projection, then this isn&#8217;t a bug in SBE and the above test should be fixed using an unordered field comparator (something like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d99a1169d585e0ad71d6c03a2dfacc2d019f9a0/src/mongo/shell/assert.js#L198-L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;assert.docEq()&lt;/a&gt;. If, on the other hand we want the order of fields produced by SBE to match that of the classic engine, then some more thought needs to given about how to accomplish this (I don&apos;t think it&apos;s as simple as modifying the implementation of the MakeObj stage). &lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros&quot;&gt;ian.boros&lt;/a&gt;&lt;/p&gt;</comment>
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