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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>
    </build-info>


<item>
            <title>[SERVER-50080] sort not working on projection created fields in find</title>
                <link>https://jira.mongodb.org/browse/SERVER-50080</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Given query in mongodb shell:&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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.collection.find({ userId: &apos;userId&apos;, startDate: { $gt: ISODate(&quot;2020-07-01&quot;) } }, { time: { $divide: [{ $subtract: [&apos;$endDate&apos;, &apos;$startDate&apos;]  }, 3600000] } }).sort({ time: -1 })&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;sort does not affect result, always get the same no matter use &lt;p/&gt;
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&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;sort({ time: 1})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt; or &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;   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;sort({ time -1 })&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1426600">SERVER-50080</key>
            <summary>sort not working on projection created fields in find</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="cherviakov.ivan@gmail.com">Ivan Cherviakov</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Mon, 3 Aug 2020 15:04:38 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:45 +0000</updated>
                            <resolved>Tue, 18 Aug 2020 15:49:38 +0000</resolved>
                                    <version>4.4.0-rc14</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3338366" author="david.storch" created="Thu, 13 Aug 2020 20:38:28 +0000"  >&lt;p&gt;I&apos;m returning this ticket to our triage queue. The behavior here is admittedly non-obvious, but the semantics of &lt;tt&gt;find&lt;/tt&gt; have long been that the sort logically occurs &lt;em&gt;before&lt;/em&gt; the projection. I suggest that we close this ticket as &quot;Works as Designed&quot; and pursue the suggested documentation improvements in &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13808&quot; title=&quot;[Server] Make documentation about order of operations in find() more clear&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13808&quot;&gt;DOCS-13808&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3321425" author="ian.boros" created="Tue, 4 Aug 2020 21:43:09 +0000"  >&lt;p&gt;Filed &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13808&quot; title=&quot;[Server] Make documentation about order of operations in find() more clear&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13808&quot;&gt;DOCS-13808&lt;/a&gt; summarizing the necessary docs changes (I included links to the sections Asya and Dan linked to along with some others). I&apos;m returning this to the backlog now.&lt;/p&gt;</comment>
                            <comment id="3320385" author="asya" created="Tue, 4 Aug 2020 18:54:29 +0000"  >&lt;p&gt;There&apos;s a &lt;a href=&quot;https://docs.mongodb.com/master/reference/method/cursor.sort/#interaction-with-projection&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;note about this in the docs&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3318035" author="cherviakov.ivan@gmail.com" created="Mon, 3 Aug 2020 17:03:24 +0000"  >&lt;p&gt;Thanks for explanation, indeed pretty confusing behaviour.&lt;/p&gt;</comment>
                            <comment id="3318004" author="ian.boros" created="Mon, 3 Aug 2020 16:50:37 +0000"  >&lt;p&gt;The problem here is that the sort is performed before the projection. When the sort is done, each document has the same value for the field &apos;time&apos;. Since our sort implementation happens to be stable, it is effectively a noop and you get this unintuitive behavior. You can verify this by running an explain() of the query.&lt;/p&gt;

&lt;p&gt;This does raise an interesting issue though. Historically, find() queries always provide results as if the operators were executed in the following order:&lt;br/&gt;
match -&amp;gt; sort -&amp;gt; skip -&amp;gt; limit -&amp;gt; project&lt;/p&gt;

&lt;p&gt;There are cases where the actual execution of the query is done in a different order than this. For example, sometimes the &apos;limit&apos; and &apos;sort&apos; are combined into a top-k sort. We&apos;ve also implemented an optimization where project stages are moved earlier than sort stages when the planner can determine that the project stage will make the documents smaller (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15200&quot; title=&quot;Query planner should move projection stage below sort stage when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15200&quot;&gt;&lt;del&gt;SERVER-15200&lt;/del&gt;&lt;/a&gt;). None of these optimizations alter the semantics of find(), though. This has probably never come up before because expressions in find projection are&#160; new to 4.4.&lt;/p&gt;

&lt;p&gt;After discussing with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; we&apos;ve agreed to put this into needs triage for the query optimization team. While I don&apos;t think we should change the semantics of find(), it would be good if we can come up with a way to make this more user-friendly.&lt;/p&gt;

&lt;p&gt;Note that if we did want to change the semantics of find(), we&apos;d likely break existing queries which sort on a field which is modified via $slice, $elemMatch or &apos;$&apos; in the projection.&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;
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