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    <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-65115] INLJ cannot be used if collation of the index doesn&apos;t match the effective collation of $lookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-65115</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The effective collation on $lookup can be set through various means (_internalCollation property on $lookup stage, collation property on the pipeline, collation of the local collection) and might not match the collation of the index of the foreign collection. In this case we should fall back to using NLJ/HJ algorithms.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2013147">SERVER-65115</key>
            <summary>INLJ cannot be used if collation of the index doesn&apos;t match the effective collation of $lookup</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Mar 2022 14:07:28 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:16 +0000</updated>
                            <resolved>Wed, 6 Apr 2022 14:36:48 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4461198" author="xgen-internal-githook" created="Wed, 6 Apr 2022 14:35:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;rui.liu@mongodb.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65115&quot; title=&quot;INLJ cannot be used if collation of the index doesn&amp;#39;t match the effective collation of $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65115&quot;&gt;&lt;del&gt;SERVER-65115&lt;/del&gt;&lt;/a&gt; Fix collation for $lookup pushdown using index join strategy&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b455f601072c1c3a75bbdefb252cf2642822a0a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b455f601072c1c3a75bbdefb252cf2642822a0a6&lt;/a&gt;&lt;/p&gt;</comment>
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