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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-59840] Make change stream mixed-collator check more robust</title>
                <link>https://jira.mongodb.org/browse/SERVER-59840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59426&quot; title=&quot;Do not mix collations during change stream rewrites&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59426&quot;&gt;&lt;del&gt;SERVER-59426&lt;/del&gt;&lt;/a&gt;, we forbid change streams from engaging in oplog rewrites in cases where the user specified a non-simple collation. However, in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58514&quot; title=&quot;Add &amp;quot;fullDocument&amp;quot; to fields eligible for $match optimization in change streams pipelines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58514&quot;&gt;&lt;del&gt;SERVER-58514&lt;/del&gt;&lt;/a&gt; we discovered that this could still happen and had to add in &lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0a0d7eecccf38f028a77c4cc8b0f13f8673f675#diff-f98a480112653432f8bf619c7583789184d1511aee481111dd696adc57f77753R332-R338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;specific checks to avoid it&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The issue here is that our current check is based on whether the collator set on the &lt;tt&gt;ExpressionContext&lt;/tt&gt; is &lt;tt&gt;nullptr&lt;/tt&gt; or not (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a0a0d7eecccf38f028a77c4cc8b0f13f8673f675/src/mongo/db/pipeline/document_source_change_stream_oplog_match.cpp#L140-L145&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a0a0d7eecccf38f028a77c4cc8b0f13f8673f675/src/mongo/db/pipeline/document_source_change_stream_unwind_transaction.cpp#L408-L412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;). This works OK for the first time we attempt to do optimization, which runs with the user-specified collation. However, we then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7d222de143cd6ebb1d0613120d2219ba8e3ff41e/src/mongo/db/commands/run_aggregate.cpp#L779-L785&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;temporarily change the collation on the &lt;tt&gt;ExpCtx&lt;/tt&gt; to &lt;tt&gt;nullptr&lt;/tt&gt;&lt;/a&gt; right before attempting to absorb the initial &lt;tt&gt;$match&lt;/tt&gt; into the query system. During that process, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7d222de143cd6ebb1d0613120d2219ba8e3ff41e/src/mongo/db/pipeline/pipeline_d.cpp#L716&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we call &lt;tt&gt;optimize()&lt;/tt&gt; again&lt;/a&gt; with the collation now set to &lt;tt&gt;nullptr&lt;/tt&gt;, which bypasses our checks and incorrectly rewrites the user&apos;s filters into the oplog.&lt;/p&gt;

&lt;p&gt;We must ensure that, once we see a non-simple collator on the &lt;tt&gt;ExpCtx&lt;/tt&gt; during optimization, any future attempts at optimization will be abandoned, regardless of what the collation is at that point. We should also remove the &lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0a0d7eecccf38f028a77c4cc8b0f13f8673f675#diff-f98a480112653432f8bf619c7583789184d1511aee481111dd696adc57f77753R332-R338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;additional code added to handled this&lt;/a&gt; in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58514&quot; title=&quot;Add &amp;quot;fullDocument&amp;quot; to fields eligible for $match optimization in change streams pipelines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58514&quot;&gt;&lt;del&gt;SERVER-58514&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1870007">SERVER-59840</key>
            <summary>Make change stream mixed-collator check more robust</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Sep 2021 21:03:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:48 +0000</updated>
                            <resolved>Wed, 15 Sep 2021 23:23:00 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4106611" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:29:33 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4064425" author="xgen-internal-githook" created="Wed, 15 Sep 2021 23:01:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59840&quot; title=&quot;Make change stream mixed-collator check more robust&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59840&quot;&gt;&lt;del&gt;SERVER-59840&lt;/del&gt;&lt;/a&gt; Do not perform pipeline optimization with temporary collator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0bc8d6bd356392745764362465cfcbe836b9854a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0bc8d6bd356392745764362465cfcbe836b9854a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1818531">SERVER-58514</issuekey>
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            <issuekey id="1854377">SERVER-59426</issuekey>
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