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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-43609] Consider applying FieldPath validation rules to MatchExpressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-43609</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;All paths used in aggregation use a single set of rules for validation, defined by our &lt;tt&gt;FieldPath&lt;/tt&gt; class.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Paths used in the match language ($match and find()&apos;s &apos;filter&apos; argument) go through a different set of rules for validation, which are for the most part looser.&lt;/p&gt;

&lt;p&gt;Since these two languages interact (via dependency analysis of the $match stage), this has lead to some problems. For example, a user could refer to a field in a $match stage that&apos;s illegal to use elsewhere in aggregation (e.g. a $-prefixed field). This showed up&#160;in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39109&quot; title=&quot;mongod crash: Invariant failure !_exec src/mongo/db/pipeline/document_source_cursor.cpp 295&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39109&quot;&gt;&lt;del&gt;SERVER-39109&lt;/del&gt;&lt;/a&gt; (a server crasher).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We should consider making all paths used in match expressions follow the validation rules of &lt;tt&gt;FieldPath&lt;/tt&gt;. This would bring us closer to a query language with a common set of rules about paths.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;As a less radical alternative, we could also only apply FieldPath validation rules to match expressions used in a $match, though it may be harder to write.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;It&apos;s worth noting that today these rules are enforced for $match in aggregation, but only because of the way we push down projections from DocumentSource to PlanStage (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f27f82560f129f6ccd9b16fba887949ab197e678/src/mongo/db/pipeline/dependencies.cpp#L120-L142&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). This validation seems to happen &quot;by accident&quot; (it happens during an implicit constructor call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f27f82560f129f6ccd9b16fba887949ab197e678/src/mongo/db/pipeline/dependencies.cpp#L138&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="938929">SERVER-43609</key>
            <summary>Consider applying FieldPath validation rules to MatchExpressions</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="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Sep 2019 18:51:57 +0000</created>
                <updated>Tue, 6 Dec 2022 02:46:43 +0000</updated>
                                                                            <component>Querying</component>
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