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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-64403] Find queries with SORT_MERGE collation-encode the missing sort attribute </title>
                <link>https://jira.mongodb.org/browse/SERVER-64403</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;`SORT_MERGE` stage merges multiple sorted streams. &lt;br/&gt;
 When the collection has collation enabled, the comparison function has three different cases:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If for both left-hand-side and right-hand-side the sort attribute are present in the index key, then a regular BSONObj comparison is enough, as both index-keys are collation-encoded&lt;/li&gt;
	&lt;li&gt;If none of them have sort attribute as part of the index key, perform the comparison with the help of the collator&lt;/li&gt;
	&lt;li&gt;If only of the sides has sort attribute as part of the index key, then perform the collation-encoding of the other side and then perform the regular BSONObj comparison with both sides being collation-encoded&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The issue arises in the third case, when we are trying to perform the collation-encoding of a document with a missing sort attribute. In this case an invariant is violated and mongod crashes.&lt;/p&gt;

&lt;p&gt;The solution would be to perform the collation-encoding only in the case, when the sort attribute is present.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1998465">SERVER-64403</key>
            <summary>Find queries with SORT_MERGE collation-encode the missing sort attribute </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="denis.grebennicov@mongodb.com">Denis Grebennicov</assignee>
                                    <reporter username="denis.grebennicov@mongodb.com">Denis Grebennicov</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Mar 2022 12:03:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:17 +0000</updated>
                            <resolved>Fri, 11 Mar 2022 14:25:23 +0000</resolved>
                                                    <fixVersion>5.3.2</fixVersion>
                    <fixVersion>6.0.0-rc0</fixVersion>
                    <fixVersion>5.0.7</fixVersion>
                    <fixVersion>4.4.16</fixVersion>
                    <fixVersion>4.2.22</fixVersion>
                    <fixVersion>5.2.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4707910" author="xgen-internal-githook" created="Wed, 27 Jul 2022 09:24:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ceb58e6cce4483f73ec38b7c827c2e3f6d7636fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ceb58e6cce4483f73ec38b7c827c2e3f6d7636fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4707865" author="xgen-internal-githook" created="Wed, 27 Jul 2022 08:56:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8155c5fa863de0fd5ea59a8c4ada2e59447006e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8155c5fa863de0fd5ea59a8c4ada2e59447006e0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4460629" author="xgen-internal-githook" created="Wed, 6 Apr 2022 11:35:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: v5.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e529d053e0275df760955b3215b90353bde560c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e529d053e0275df760955b3215b90353bde560c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4407341" author="xgen-internal-githook" created="Fri, 11 Mar 2022 19:16:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c26d169cfe6d0d369b422e7de0c54b68ec8b8ec5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c26d169cfe6d0d369b422e7de0c54b68ec8b8ec5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4407026" author="xgen-internal-githook" created="Fri, 11 Mar 2022 17:20:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/daeb6fe7116f3835c2e04603536e18e8fc06facd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/daeb6fe7116f3835c2e04603536e18e8fc06facd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4406222" author="xgen-internal-githook" created="Fri, 11 Mar 2022 12:46:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Denis Grebennicov&apos;, &apos;email&apos;: &apos;denis.grebennicov@mongodb.com&apos;, &apos;username&apos;: &apos;denis631&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64403&quot; title=&quot;Find queries with SORT_MERGE collation-encode the missing sort attribute &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64403&quot;&gt;&lt;del&gt;SERVER-64403&lt;/del&gt;&lt;/a&gt; Encode the sort key from a document with collation only if value is present when comparing a sort key from index with one from the document in SORT_MERGE stage.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/915208b32bc1acc2789fb5d1932d0a8902a9b6cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/915208b32bc1acc2789fb5d1932d0a8902a9b6cf&lt;/a&gt;&lt;/p&gt;</comment>
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