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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>
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<item>
            <title>[SERVER-28791] query failed: an empty object is not a valid value</title>
                <link>https://jira.mongodb.org/browse/SERVER-28791</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It seems there is a issue in the latest mongo release 3.4.3. The code below was &lt;br/&gt;
working fine with Mongo version 3.2.9. But we run into the error with &lt;br/&gt;
3.4.3. &lt;/p&gt;
&lt;p/&gt;
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					&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;{aggregate([{ &quot;$match&quot; : { &lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;dtHeader.Equipment_ID&quot; : NumberLong(7), &quot;dtHeader.SnapshotType&quot; : &quot;Snapshot&quot;, &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;dtHeader.RevolutionTimeStamp&quot; : { &quot;$gte&quot; : &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;ISODate(&quot;2017-04-09T07:48:54.351Z&quot;), &quot;$lte&quot; : &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;ISODate(&quot;2017-04-10T19:48:54.351Z&quot;) }, &quot;dtHeader.RevolutionNumber&quot; : { &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$gte&quot; : 1, &quot;$lte&quot; : 1 } } }, { &quot;$project&quot; : { &quot;RevolutionTimeStamp&quot; : &lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&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;   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;&quot;$dtHeader.RevolutionNumber&quot;, &quot;Historians&quot; : { },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;Statistics&quot; : { &quot;29_2&quot; : &quot;$dtStatistics.29.2&quot; }, &quot;ComputationEquipment&quot; : &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;&quot;$dtComputation_Equipment&quot;, &quot;Annotations&quot; : &quot;$dtAnnotation&quot;, &quot;ManualAnnotations&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;   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;: &quot;$dtAnnotation_Manual&quot; } }])} &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;Message = &quot;Command aggregate failed: Invalid $project &lt;br/&gt;
specification: an empty object is not a valid value. Found empty object at path &lt;br/&gt;
Historians.&quot; &lt;/p&gt;</description>
                <environment>windows server 2012</environment>
        <key id="372756">SERVER-28791</key>
            <summary>query failed: an empty object is not a valid value</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="charlie111">Zhuoxiong Sun</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Apr 2017 21:31:04 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:31 +0000</updated>
                            <resolved>Mon, 17 Apr 2017 20:51:38 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1550934" author="mark.agarunov" created="Mon, 17 Apr 2017 20:51:25 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie111&quot; class=&quot;user-hover&quot; rel=&quot;charlie111&quot;&gt;charlie111&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. The behavior you&apos;re seeing is due to a change made in 3.4. As per &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/project/#restrictions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the documentation for the &lt;tt&gt;$project&lt;/tt&gt; operator&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;MongoDB 3.4 and later produces an error if the $project specification is an empty document.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1545532" author="charlie111" created="Mon, 10 Apr 2017 21:35:17 +0000"  >&lt;p&gt;The stars outside &quot;Historians&quot; : { }, was not part of the code. It was to &lt;b&gt;bold&lt;/b&gt; the text&lt;/p&gt;</comment>
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