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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-76855] Audit mongos for improper usage of collation and incorrectly assuming simple collation rather than collection default</title>
                <link>https://jira.mongodb.org/browse/SERVER-76855</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While reviewing new code from PM-1632, I spot&amp;#45;checked some existing patterns for how the collation is being resolved by mongos. It appears the are multiple cases where the std::unique_ptr&amp;lt;CollatorInterface&amp;gt; is left nullptr when the collation specification is an empty BSONObj() despite the rule being &quot;when the collation is unspecified in the request the collection&apos;s default collation is used to satisfy the operation.&quot; Without further investigation it is unclear the extent to which mongos would be doing post&amp;#45;processing of results after merging cursor results (e.g. $group followed by $match) where the &lt;tt&gt;collator&lt;/tt&gt; used by mongos is relevant for the correctness of query results.&lt;/p&gt;

&lt;p&gt;Moreover, the contract desired by ExpressionContext is impossible for mongos to uphold given that mongos has no knowledge about the default collation for unsharded collections. The sharding catalog only stores the collation specification for sharded collections.&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;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;   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;* The ExpressionContext is always set up with the fully-resolved collation. So even though&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;   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;* SERVER-24433 describes an ambiguity between a null collator, here we can say confidently that&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;* null must mean simple since we have already handled &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;absence of a collator&quot;&lt;/span&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; before creating&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;   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;* the ExpressionContext.&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Hopefully we can produce an interface which leverages the C++ type system to enforce the following contract:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;mongos incorrectly fills in the &lt;tt&gt;collator&lt;/tt&gt; for unsharded collections as simple collation but promises to not ever use it.&lt;/li&gt;
	&lt;li&gt;mongos correctly fills in the &lt;tt&gt;collator&lt;/tt&gt; for sharded collections by consulting the &lt;tt&gt;ChunkManager&lt;/tt&gt; and uses it when responsible for merging + post&amp;#45;processing.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2332341">SERVER-76855</key>
            <summary>Audit mongos for improper usage of collation and incorrectly assuming simple collation rather than collection default</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="13201">Fixed</resolution>
                                        <assignee username="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 May 2023 18:41:14 +0000</created>
                <updated>Mon, 22 Jan 2024 22:50:52 +0000</updated>
                            <resolved>Tue, 10 Oct 2023 20:30:08 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                    <component>Distributed Query Execution</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5768856" author="xgen-internal-githook" created="Tue, 10 Oct 2023 19:46:24 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@mongodb.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76855&quot; title=&quot;Audit mongos for improper usage of collation and incorrectly assuming simple collation rather than collection default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76855&quot;&gt;&lt;del&gt;SERVER-76855&lt;/del&gt;&lt;/a&gt; Ignore collator on mongos when targeting an unsharded collection and user did not specify collation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cff66caa0096f7a1f20ca7cd2d5927a086f51bb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cff66caa0096f7a1f20ca7cd2d5927a086f51bb0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5652078" author="mihai.andrei" created="Tue, 22 Aug 2023 21:37:29 +0000"  >&lt;p&gt;Going to take this one as this is needed in order to do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80145&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-80145&lt;/a&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5401775" author="max.hirschhorn@10gen.com" created="Thu, 4 May 2023 18:42:01 +0000"  >&lt;p&gt;Below are my findings from the simple audit I did based on the &lt;tt&gt;collation.isEmpty()&lt;/tt&gt; pattern used in the codebase.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fba9dd05de659730512c9f2af0752cc71793c2fd/src/mongo/s/cluster_commands_helpers.cpp#L95-L102&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;makeExpressionContextWithDefaultsForTargeter()&lt;/a&gt; assumes an empty collation specification implies simple collation. This helper is used in a number of places which I didn&apos;t check to see if the collation specification is possibly coming from the ChunkManager already.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fba9dd05de659730512c9f2af0752cc71793c2fd/src/mongo/s/commands/cluster_map_reduce_agg.cpp#L70-L75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cluster&amp;#95;map&amp;#95;reduce&amp;#95;agg.cpp&lt;/a&gt; assumes an empty collation specification implies simple collation.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fba9dd05de659730512c9f2af0752cc71793c2fd/src/mongo/s/commands/cluster_query_without_shard_key_cmd.cpp#L87-L91&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cluster&amp;#95;query&amp;#95;without&amp;#95;shard&amp;#95;key&amp;#95;cmd.cpp&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fba9dd05de659730512c9f2af0752cc71793c2fd/src/mongo/s/write_ops/write_without_shard_key_util.cpp#L199-L206&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;write&amp;#95;without&amp;#95;shard&amp;#95;key&amp;#95;util.cpp&lt;/a&gt; will get re&amp;#45;reviewed as part of PM-1632. CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.zhang%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jason.zhang@mongodb.com&quot;&gt;jason.zhang@mongodb.com&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fba9dd05de659730512c9f2af0752cc71793c2fd/src/mongo/s/query/cluster_aggregate.cpp#L122-L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cluster&amp;#95;aggregate.cpp&lt;/a&gt; assumes an empty collation specification implies simple collation.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&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;   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;$ git grep -E &apos;collation.*isEmpty&apos; -- src/mongo/s/&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;src/mongo/s/chunk_manager.cpp:353:    const bool hasSimpleCollation = (collation.isEmpty() &amp;amp;&amp;amp; !_rt-&amp;gt;optRt-&amp;gt;getDefaultCollator()) ||&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;src/mongo/s/cluster_commands_helpers.cpp:96:        if (collation.isEmpty()) {&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;src/mongo/s/cluster_commands_helpers.cpp:185:    if (!collation.isEmpty()) {&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;src/mongo/s/collection_routing_info_targeter.cpp:322:    if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/collection_routing_info_targeter.cpp:600:    if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/commands/cluster_distinct_cmd.cpp:214:        if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/commands/cluster_distinct_cmd.cpp:281:                                  !collation.isEmpty()&lt;/span&gt;&lt;/pre&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;src/mongo/s/commands/cluster_map_reduce_agg.cpp:71:    if (!collationObj.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/commands/cluster_query_without_shard_key_cmd.cpp:88:    if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/commands/sharding_expressions.cpp:82:        if (auto collation = indexDescriptor-&amp;gt;collation(); !collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/query/cluster_aggregate.cpp:123:    if (!collationObj.isEmpty()) {&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;src/mongo/s/query/cluster_aggregation_planner.cpp:814:    return {collation.isEmpty() ? getCollation() : collation, getUUID()};&lt;/span&gt;&lt;/pre&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;src/mongo/s/shard_key_pattern_query_util.cpp:418:    if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/write_ops/write_without_shard_key_util.cpp:71:    if (!collation.isEmpty()) {&lt;/span&gt;&lt;/pre&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;src/mongo/s/write_ops/write_without_shard_key_util.cpp:90:        if (CollationIndexKey::isCollatableType(idElt.type()) &amp;amp;&amp;amp; !collation.isEmpty() &amp;amp;&amp;amp;&lt;/span&gt;&lt;/pre&gt;
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