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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-21946] when sent invalid BSON, server runs one thing and prints another in the logs</title>
                <link>https://jira.mongodb.org/browse/SERVER-21946</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Due to &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-504&quot; title=&quot;Convenient API to create BSON arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-504&quot;&gt;&lt;del&gt;CDRIVER-504&lt;/del&gt;&lt;/a&gt; my code managed to send the following pipeline BSON to the server:&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;{ &quot;0&quot; : { &quot;$unwind&quot; : { &quot;includeArrayIndex&quot; : &quot;a_idx&quot;, &quot;path&quot; : &quot;$a&quot; } }, &quot;0&quot; : { &quot;$match&quot; : { &quot;a.b&quot; : { &quot;$lt&quot; : 3 } } }, &quot;0&quot; : { &quot;$project&quot; : { &quot;a.b&quot; : 1, &quot;a_idx&quot; : 1, &quot;_id&quot; : 0 } } }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This is not technically valid (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16814&quot; title=&quot;Validate array keys in BSON documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16814&quot;&gt;SERVER-16814&lt;/a&gt;) but it&apos;s accepted and run.  This ticket is about the fact that what server runs is just the last stage, but what it logs into server logs is a correct looking pipeline:&lt;/p&gt;

&lt;p&gt;This is debugging output showing the only document in the collection returned unwounded and unfiltered (but with project applied):&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;fetched row { &quot;a&quot; : [ { &quot;b&quot; : 1 }, { &quot;b&quot; : 2 }, { &quot;b&quot; : 3 } ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;This is the corresponding log line:&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;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;2015-12-18T07:39:53.058-0800 I COMMAND  [conn181] command test.test3 command: aggregate { aggregate: &quot;test3&quot;, pipeline: [ { $unwind: { includeArrayIndex: &quot;a_idx&quot;, path: &quot;$a&quot; } }, { $project: { _id: 1, a.b: 1, a_idx: 1 } } ], cursor: {}, allowDiskUse: true } ntoskip:0 keyUpdates:0 writeConflicts:0 numYields:0 reslen:470 locks:{ Global: { acquireCount: { r: 6 } }, Database: { acquireCount: { r: 3 } }, Collection: { acquireCount: { r: 3 } } } protocol:op_query 0ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="244494">SERVER-21946</key>
            <summary>when sent invalid BSON, server runs one thing and prints another in the logs</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Fri, 18 Dec 2015 15:57:23 +0000</created>
                <updated>Tue, 6 Dec 2022 04:37:13 +0000</updated>
                                            <version>3.2.0</version>
                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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                                        <issuelink>
            <issuekey id="178307">CDRIVER-504</issuekey>
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            <issuekey id="178309">SERVER-16814</issuekey>
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