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    <title>MongoDB Jira</title>
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    <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-70234] [CQF] Order of fields in output documents of simple inclusion projection queries is not the same in CQF vs SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-70234</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Order of fields in output documents of simple inclusion projection queries is not the same in CQF vs SBE.&lt;/p&gt;

&lt;p&gt;Consider the following documents:&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;{ &#8220;_id&#8221; : 0, &#8220;a1&quot; : { &#8220;b1&#8221; : 1, &#8220;c1&quot; : 1 }, &#8220;a2&#8221; : { &#8220;b2&quot; : 1, &#8220;c2&#8221; : 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;{ &#8220;_id&#8221; : 1, &#8220;a2&#8221; : { &#8220;c2&quot; : 1, &#8220;b2&#8221; : 1 }, &#8220;a1&quot; : { &#8220;c1&#8221; : 1, &#8220;b1&quot; : 1 } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;and the query&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;{$project: {&#8216;a2.b2&#8217;: 1, &#8216;a1.b1&#8217;: 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;SBE orders the fields by the order in which they were included in the projection spec, so in both output docs we see &quot;a2&quot; followed by &quot;a1&quot;. CQF orders the fields alphabetically, so in both output docs we see &quot;a1&quot; followed be &quot;a2&quot;.&lt;/p&gt;

&lt;p&gt;Classic does something else; it maintains the order of the fields in the input document. The classic/SBE difference seemed to be approved.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2152347">SERVER-70234</key>
            <summary>[CQF] Order of fields in output documents of simple inclusion projection queries is not the same in CQF vs SBE</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                            <label>bonsai-semantic-difference</label>
                    </labels>
                <created>Wed, 5 Oct 2022 14:32:53 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:52 +0000</updated>
                            <resolved>Thu, 24 Aug 2023 14:08:03 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2152433">SERVER-70236</issuekey>
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