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<channel>
    <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-24799] $group aggregation command should maintain document order</title>
                <link>https://jira.mongodb.org/browse/SERVER-24799</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I just wasted a ton of time before realizing that $group doesn&apos;t group by the order of input documents. This is incredibly counter-intuitive and makes the already-complicated aggregation more complex to understand. I don&apos;t see why $group shouldn&apos;t guarantee input order, and it would be very helpful if it did. &lt;/p&gt;</description>
                <environment></environment>
        <key id="296637">SERVER-24799</key>
            <summary>$group aggregation command should maintain document order</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="fresheneesz">Billy Tetrud</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Jun 2016 22:59:43 +0000</created>
                <updated>Tue, 6 Dec 2022 04:22:47 +0000</updated>
                            <resolved>Wed, 17 Jan 2018 22:10:33 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="4129163" author="JIRAUSER1256437" created="Mon, 18 Oct 2021 13:21:51 +0000"  >&lt;p&gt;@Asya Kamsky&lt;/p&gt;

&lt;p&gt;I just went into the same issue and although being intuitive or not is subjective we are running into objective problem as well - by ignoring data being ordered by the same key (with proper index and sort on that key) group becomes a non-streaming op which makes it subject to 100MB limit and gives worse experience and perrofmance in some cases.&lt;/p&gt;</comment>
                            <comment id="3278135" author="asya" created="Thu, 9 Jul 2020 18:14:41 +0000"  >&lt;p&gt;Adding a note here since this ticket was linked as example of something that&apos;s a misunderstanding:&lt;/p&gt;

&lt;p&gt;$group always honors the order the documents are arriving &lt;b&gt;into&lt;/b&gt; the $group stage, so if you $sort and then $group with $first, $last, $push etc then the order very much matters and will make a difference to each document within $group.&lt;/p&gt;

&lt;p&gt;What is never guaranteed (at least at this point) is that &lt;b&gt;after&lt;/b&gt; the group stage the entire stream of documents would be ordered by &quot;something&quot;.  So if you want it ordered by group &lt;tt&gt;_id&lt;/tt&gt; field, you have to sort after $group.  If you want it sorted by some other field, you have to $sort by that after $group.&lt;/p&gt;</comment>
                            <comment id="1777230" author="asya" created="Wed, 17 Jan 2018 22:10:33 +0000"  >&lt;p&gt;We haven&apos;t been able to determine a use case that requires new functionality so I&apos;m closing this as Won&apos;t Fix.&lt;/p&gt;

&lt;p&gt;If you think that&apos;s a mistake, please provide an example with input documents, pipeline and desired output so we can see how the requested behavior would work.&lt;/p&gt;</comment>
                            <comment id="1415862" author="asya" created="Mon, 24 Oct 2016 16:55:44 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=uji&quot; class=&quot;user-hover&quot; rel=&quot;uji&quot;&gt;uji&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;An array can be unwound emitting index of each element along with value.&lt;/p&gt;

&lt;p&gt;Starting with 3.4 arrays can also be $zip&apos;ed together with a generated sequence.  &lt;/p&gt;

&lt;p&gt;It&apos;s not really clear to me why the &quot;roads&quot; example needs $group to maintain document order as you didn&apos;t describe what objective $group is fulfilling.&lt;/p&gt;

&lt;p&gt;This type of MongoDB-related support discussion would be best posted on the &lt;a href=&quot;http://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;Asya&lt;/p&gt;</comment>
                            <comment id="1415561" author="uji" created="Mon, 24 Oct 2016 13:32:40 +0000"  >&lt;p&gt;I have a use case where maintaining the order of inputs document would make a big difference&lt;/p&gt;

&lt;p&gt;Suppose the collection &quot;roads&quot; whose elements refer to the elements of the collection &quot;points&quot;. It is a 1:N relationship implemented via the array property &quot;pointIds&quot; on the collection &quot;roads&quot;. This because the points of the roads are ordered (from the beginning to the end of the road). &lt;/p&gt;

&lt;p&gt;Just to clarify, the ordering of the &quot;points&quot; is purely maintained by the array, i.e. there are no properties of &quot;points&quot; that allow to deduct their order.&lt;/p&gt;

&lt;p&gt;An aggregation pipeline on roads that uses $lookup to retrieve the list of points cannot use $group because it would lose the information about the ordering.&lt;/p&gt;

</comment>
                            <comment id="1395033" author="fresheneesz" created="Tue, 27 Sep 2016 20:12:24 +0000"  >&lt;p&gt;Asya, that&apos;s super helpful info. Thanks!&lt;/p&gt;</comment>
                            <comment id="1394900" author="asya" created="Tue, 27 Sep 2016 18:32:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=fresheneesz&quot; class=&quot;user-hover&quot; rel=&quot;fresheneesz&quot;&gt;fresheneesz&lt;/a&gt; you can do this in upcoming 3.4 without any unwind and group using the new &lt;a href=&quot;https://docs.mongodb.com/master/reference/operator/aggregation/reduce/#exp._S_reduce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$reduce&lt;/a&gt; expression.  This could be the $project stage to extract the field by which you want to sort via $sort:{&quot;sortDate&quot;:1}:&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;
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						&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;    history:1, &lt;/span&gt;&lt;/pre&gt;
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						&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;    sortDate: { $reduce: { &lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                           input:&quot;$history&quot;, &lt;/span&gt;&lt;/pre&gt;
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					&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;                           initialValue:0, &lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&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: { $cond: { &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                      if: {$eq:[&quot;$$this.field&quot;,&quot;b&quot;]},&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                              if:{$gt:[&quot;$$this.date&quot;,&quot;$$value&quot;]},&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In your sample document it creates new field &quot;sortDate&quot; which is the largest &quot;date&quot; value in the array element where field is &quot;b&quot;.&lt;/p&gt;

&lt;p&gt;You can do it in the current 3.2 version via &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/filter/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$filter&lt;/a&gt; and &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/max/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$max&lt;/a&gt; operators in $project stage as well and then sort by &quot;sortDate.date&quot;:&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;
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&lt;p/&gt;
</comment>
                            <comment id="1314631" author="fresheneesz" created="Tue, 5 Jul 2016 21:58:03 +0000"  >&lt;p&gt;Is that discussion somewhere I can view? Why wouldn&apos;t my requested behavior make sense? &lt;/p&gt;

&lt;p&gt;&quot;if your application requires some ordering of documents, you would specify that somehow, e.g. via a $sort&quot;&lt;/p&gt;

&lt;p&gt;Yes, and if you $sort something &lt;b&gt;then&lt;/b&gt; use a $group command, the sort is invalidated. This doesn&apos;t make sense, as the output of all the other commands are respected in the aggregation pipeline. &lt;/p&gt;

&lt;p&gt;&quot;Could you accomplish the ordering you need by adding a $sort stage after the $group?&quot;&lt;/p&gt;

&lt;p&gt;No. Here&apos;s my use case. I have documents with nested object representing its history 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;var document = {&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;  history: [&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;    {field:&apos;a&apos;, date:142983472},&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;    {field:&apos;b&apos;, date:142983473},&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;    {field:&apos;c&apos;, date:142983474},&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;    {field:&apos;b&apos;, date:142983475},&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;    {field:&apos;b&apos;, date:142983476},&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;  ]&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;}&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;And I want to sort the documents by the last modified date of a certain field. So lets say that field is b, I want to sort by the date 142983476. In order to do this, I need to unwind the history, project it in a certain way to expose only the dates I want, then sort by those date, then group by _id. But if grouping doesn&apos;t respect sort order, this won&apos;t work.&lt;/p&gt;

&lt;p&gt;As a work around, I needed to build a much more complicated (and expensive) first projection stage, then after grouping I need an extra projection stage, then I can sort as the last stage. This was much harder to reason about and is more expensive to run. &lt;/p&gt;</comment>
                            <comment id="1313971" author="charlie.swanson" created="Tue, 5 Jul 2016 15:27:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=fresheneesz&quot; class=&quot;user-hover&quot; rel=&quot;fresheneesz&quot;&gt;fresheneesz&lt;/a&gt;, after some discussion, we&apos;re not sure the notion of ordering by the sequence of input documents makes much sense. Generally, if your application requires some ordering of documents, you would specify that somehow, e.g. via a &lt;tt&gt;$sort&lt;/tt&gt;. Can you elaborate on exactly why this behavior would be useful? Could you accomplish the ordering you need by adding a &lt;tt&gt;$sort&lt;/tt&gt; stage after the &lt;tt&gt;$group&lt;/tt&gt;?&lt;/p&gt;

&lt;p&gt;I&apos;ll note that this may be related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4507&quot; title=&quot;aggregation:  optimize $group to take advantage of sorted sequences&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4507&quot;&gt;SERVER-4507&lt;/a&gt;, which will in some cases allow the &lt;tt&gt;$group&lt;/tt&gt; stage to take advantage of sorted sequences, preserving the order.&lt;/p&gt;</comment>
                            <comment id="1308200" author="fresheneesz" created="Tue, 28 Jun 2016 00:03:02 +0000"  >&lt;p&gt;I suppose I&apos;ve been working with Javascript too long and assumed that mongo mapping would work like Javascript mapping. But of course MongoDB is written in C.. Anyways, yes that&apos;s exactly what I mean. But the overhead should be pretty insignificant I would think. &lt;/p&gt;</comment>
                            <comment id="1307323" author="charlie.swanson" created="Mon, 27 Jun 2016 13:51:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=fresheneesz&quot; class=&quot;user-hover&quot; rel=&quot;fresheneesz&quot;&gt;fresheneesz&lt;/a&gt;, &lt;/p&gt;

&lt;p&gt;Just to clarify, you&apos;re looking for the order of output documents to match the order of input documents? The reason the order is not preserved is that we keep track of all groups with a map from the &lt;tt&gt;_id&lt;/tt&gt; to the accumulated value, so that we can quickly look up which group an incoming document belongs to.&lt;/p&gt;

&lt;p&gt;For exemple, with the group stage&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;{$group: {_id: {$toLower: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$x&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}, count: {$sum: 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;And inputs given in this order:&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;{x: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;{x: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;bar&quot;&lt;/span&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;{x: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;BAR&quot;&lt;/span&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;   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;{x: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;FOO&quot;&lt;/span&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;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;You would expect the following output?&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;{_id: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;, count: 2}&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;{_id: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;bar&quot;&lt;/span&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;, count: 2}&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 is definitely possible, but will require some extra overhead to keep track of the order of the groups.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="812351">SERVER-41891</issuekey>
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