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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-22833] MatchExpression::toBSON does not necessarily produce a valid query object.</title>
                <link>https://jira.mongodb.org/browse/SERVER-22833</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Queries are represented internally as a MatchExpression tree, which has a toBSON method that, when given a BSONObjBuilder, serializes the tree and produces a BSONObj representing the query. At the moment, there are several types of MatchExpression ($not, particularly) that do not serialize to valid query objects, and thus parsing the result of a toBSON call will result in an error. It should be the case that any MatchExpression can be roundtripped through BSON and will result in a new MatchExpression that is logically equivalent to the first.&lt;/p&gt;

&lt;p&gt;Note:&lt;br/&gt;
Most of the difficulties for this ticket are because of our complex $not semantics. Rather than go through complex logic in the parser or serialization code, we instead opted to always turn a $not into the following structure:&lt;/p&gt;

&lt;p&gt;{$not: {...}} --&amp;gt; {$nor: [{$and: &lt;span class=&quot;error&quot;&gt;&amp;#91;...&amp;#93;&lt;/span&gt;}]}&lt;/p&gt;

&lt;p&gt;While logically equivalent, the query planner is unable to perform the same level of optimization with a $nor as with a $not. At the moment, MatchExpression::toBSON is only being used in aggregation pipeline optimization, so as a result of this workaround, any $match stage that is roundtripped through BSON and involves a $not may not be correctly optimized for in the query planner, and will give unexpected explain() output. A solution to this problem is to update CanonicalQuery::normalizeTree() to recognize that a $nor with one child is logically equivalent to a $not, and perform that swap.&lt;/p&gt;</description>
                <environment></environment>
        <key id="267718">SERVER-22833</key>
            <summary>MatchExpression::toBSON does not necessarily produce a valid query object.</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="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="9">Done</resolution>
                                        <assignee username="benjamin.murphy">Benjamin Murphy</assignee>
                                    <reporter username="benjamin.murphy">Benjamin Murphy</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Feb 2016 16:32:17 +0000</created>
                <updated>Thu, 12 Jan 2017 16:04:55 +0000</updated>
                            <resolved>Mon, 14 Mar 2016 22:03:38 +0000</resolved>
                                                    <fixVersion>3.3.4</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1203134" author="xgen-internal-githook" created="Mon, 14 Mar 2016 22:00:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benjaminmurphy&apos;, u&apos;name&apos;: u&apos;Benjamin Murphy&apos;, u&apos;email&apos;: u&apos;benjamin_murphy@me.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22833&quot; title=&quot;MatchExpression::toBSON does not necessarily produce a valid query object.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22833&quot;&gt;&lt;del&gt;SERVER-22833&lt;/del&gt;&lt;/a&gt; Rename MatchExpression::toBSON() to serialize(), and ensure it produces parseable output.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/488f48f2f497a4e844aa3057e49f96d2a4be1bcb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/488f48f2f497a4e844aa3057e49f96d2a4be1bcb&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="105366">SERVER-12307</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="216938">SERVER-19415</issuekey>
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            <issuelink>
            <issuekey id="230529">SERVER-20506</issuekey>
        </issuelink>
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            <issuekey id="307337">SERVER-25485</issuekey>
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            <issuekey id="344868">SERVER-27649</issuekey>
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