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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-43855] Aggregation results aren&apos;t the same.</title>
                <link>https://jira.mongodb.org/browse/SERVER-43855</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the attachment you can find two collections and aggregation.&lt;/p&gt;

&lt;p&gt;If you repeat aggregation many times, result will be different.&lt;/p&gt;

&lt;p&gt;Why? It must be the same.&lt;/p&gt;</description>
                <environment></environment>
        <key id="961106">SERVER-43855</key>
            <summary>Aggregation results aren&apos;t the same.</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13204">Community Answered</resolution>
                                        <assignee username="carl.champain@mongodb.com">Carl Champain</assignee>
                                    <reporter username="serpro.qnx@gmail.com">Sergey Protsak</reporter>
                        <labels>
                    </labels>
                <created>Sat, 5 Oct 2019 16:07:06 +0000</created>
                <updated>Fri, 27 Oct 2023 15:56:38 +0000</updated>
                            <resolved>Mon, 7 Oct 2019 22:49:47 +0000</resolved>
                                    <version>4.2.0</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="2470158" author="asya" created="Mon, 7 Oct 2019 22:49:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=serpro.qnx%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;serpro.qnx@gmail.com&quot;&gt;serpro.qnx@gmail.com&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;There are two issues happening in your pipeline that are causing you to see slightly incorrect results. One is that you have some &lt;tt&gt;game_id&lt;/tt&gt; values which don&apos;t have corresponding values in the &lt;tt&gt;games&lt;/tt&gt; collection, this results in &lt;tt&gt;&quot;item.name&quot;&lt;/tt&gt; being missing and while normally it would cause an error to ask &lt;tt&gt;$arrayToObject&lt;/tt&gt; to convert a missing key name the reason you&apos;re not seeing the error in your pipeline is due to the way you are generating the array of two values using &lt;tt&gt;$zip&lt;/tt&gt;. Since you are passing &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; and &lt;tt&gt;&quot;$items.total&quot;&lt;/tt&gt; to $zip, what&apos;s happening is that your &quot;name&quot; array is one shorter than your &quot;total&quot; array, causing the last &quot;total&quot; to be dropped from the final object. Since we don&apos;t guarantee an order of fields (because you didn&apos;t specify that &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; should be sorted) it&apos;s likely that what you are seeing is different single value being dropped in the final result document each time you run this pipeline.&lt;/p&gt;

&lt;p&gt;I would recommend that you change this expression:&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;   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;name: &apos;$name&apos; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;to utilize &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/ifNull/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$ifNull expression &lt;/a&gt;to set the name to some fixed value (like &apos;NONAME&apos;) or maybe filter out the documents which don&apos;t find a matching game in the lookup table if that&apos;s more appropriate to your case.&lt;/p&gt;

&lt;p&gt;Note that to guarantee that the fields are exactly the same including order in the final output, you should change&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;   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;{$sort: {  &quot;items.total&quot;: -1 }} &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;to be&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; {$sort: {  &quot;items.total&quot;: -1, &quot;items.name&quot;:1 }}  &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;br/&gt;
I also noticed that you have some inefficiencies (unnecessary stages) in the pipeline, if you&apos;d like further assistance with it, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Since there is no bug here, I&apos;m going to close this ticket now. &lt;br/&gt;
Thank you for using MongoDB.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="232794" name="aggregate.zip" size="2572133" author="serpro.qnx@gmail.com" created="Sat, 5 Oct 2019 15:59:40 +0000"/>
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