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    <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-21334] find command should prohibit $-options</title>
                <link>https://jira.mongodb.org/browse/SERVER-21334</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It seems to me that this should cause an error, to protect against driver or application bugs:&lt;/p&gt;
&lt;p/&gt;
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					&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;&amp;gt; db.runCommand({find: &apos;collection&apos;, $orderby: {i: 1}})&lt;/span&gt;&lt;/pre&gt;
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                <environment></environment>
        <key id="238294">SERVER-21334</key>
            <summary>find command should prohibit $-options</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="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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Nov 2015 20:01:22 +0000</created>
                <updated>Tue, 6 Dec 2022 04:40:20 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1672201" author="shane.harvey" created="Wed, 13 Sep 2017 19:03:28 +0000"  >&lt;p&gt;We can no longer prohibit all $-prefixed keys since &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/message/OP_MSG.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OP_MSG&lt;/a&gt; uses them for global command arguments such as &lt;tt&gt;$db&lt;/tt&gt; and &lt;tt&gt;$readPreference&lt;/tt&gt;. A black list would still be possible.&lt;/p&gt;</comment>
                            <comment id="1112772" author="jesse" created="Sat, 12 Dec 2015 03:22:08 +0000"  >&lt;p&gt;Or we could prohibit all keys beginning with $, no matter what, including $foo and $whatever. You should never have a need to pass those to &quot;find&quot;.&lt;/p&gt;

&lt;p&gt;The one thing to watch out for is, this is still the right way to do a &quot;find&quot; command with a read preference on mongos:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</comment>
                            <comment id="1112622" author="rassi@10gen.com" created="Fri, 11 Dec 2015 22:06:04 +0000"  >&lt;p&gt;I suggest we blacklist $query and the other OP_QUERY dollar-options &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.0/src/mongo/db/query/lite_parsed_query.cpp#L838-L925&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;enumerated in LiteParsedQuery::initFullQuery()&lt;/a&gt;.&lt;/p&gt;</comment>
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